Glaucoma, Vision & Longevity: Supplements & Science

VisualFieldTest.com

Discover the latest science on glaucoma, vision, and longevity. Each episode explores evidence-based supplements for eye health, healthy aging, and lifespan extension. Original articles backed by real scientific research. All source links available at visualfieldtest.com, where you can also take a free visual field test online. Subscribe for weekly insights on glaucoma treatment, glaucoma prevention, vision supplements, and longevity research that could protect your sight and extend your healthspan.MEDICAL DISCLAIMER:This podcast is for educational and informational purposes only. It is not intended as medical advice, diagnosis, or treatment. The content presented should not replace professional medical consultation.Glaucoma is a serious condition that can lead to permanent vision loss. Never stop or modify prescribed treatments without consulting your ophthalmologist or healthcare provider.The supplements and research discussed are for informational purposes only. Individual results may vary, and supplements are not FDA-approved to treat, cure, or prevent any disease.Always consult a qualified healthcare professional before starting any new supplement regimen, especially if you have existing eye conditions or are taking medications.The visual field test available at visualfieldtest.com is a screening tool only and does not replace comprehensive eye exams by a licensed professional.

  1. Nocturnal hypotension, sleep apnea, and ocular perfusion: continuous monitoring studies

    1D AGO

    Nocturnal hypotension, sleep apnea, and ocular perfusion: continuous monitoring studies

    This audio article is from VisualFieldTest.com. Read the full article here: https://visualfieldtest.com/en/nocturnal-hypotension-sleep-apnea-and-ocular-perfusion-continuous-monitoring-studies Test your visual field online: https://visualfieldtest.com Support the show so new episodes keep coming: https://www.buzzsprout.com/2563091/support Excerpt: Introduction Our eyes depend on a steady blood flow and pressure balance to stay healthy. During sleep, changes in blood pressure, breathing, and even eye pressure can affect vision. In particular, a drop in blood pressure at night (nocturnal hypotension) and episodes of stopped breathing (sleep apnea) may reduce ocular perfusion pressure – the difference between blood pressure and eye pressure – and stress the optic nerve. Researchers are now using 24-hour monitoring of blood pressure, oxygen levels, and eye pressure to see how these factors line up with subtle changes in vision. This article explains how nighttime blood pressure dips and sleep apnea can influence eye health, how we can measure them, and what can be done to protect the eyes. Nighttime Blood Pressure Dips and Eye Health Most people experience a normal “dip” in blood pressure during sleep – typically a 10–20% fall compared to daytime levels. However, some individuals, especially those on blood pressure medications, experience a larger drop. When blood pressure falls too far, the ocular perfusion pressure (OPP) can become too low. The OPP is essentially the driving pressure pushing blood into the eye (roughly blood pressure minus eye pressure). If OPP drops too much, the optic nerve may not get enough blood. In fact, experts believe that the balance between intraocular pressure (IOP) and blood pressure is key to optic nerve health (). Studies confirm the danger of extreme nighttime dips. For example, glaucoma patients whose blood pressure fell far below daytime levels at night tended to have more progression of vision loss. In one long-term study of normal-tension glaucoma patients, the duration and magnitude of nocturnal blood pressure below daytime pressure predicted the rate of visual field loss (). In practical terms, this means if your nighttime blood pressure stays significantly (e.g. 10 mmHg or more) below your daytime average for many hours, your risk of glaucoma worsening is higher. Another study found that glaucoma patients who had unusual large dips in night blood pressure (so-called over-dippers) showed larger swings in ocular perfusion pressure and worse visual field test results (). Importantly, body position and sleep also matter. Normally, when you lie down, intraocular pressure (IOP) tends to rise (by 10–20%) because eye fluid drains more slowly (). So at night you may have higher IOP and lower blood pressure at the same time – a “double whammy” that can lower OPP. In simple terms, the nighttime balance of pressures can leave the optic nerve vulnerable if blood pressure drops too much or eye pressure rises too much. Sleep Apnea and Oxygen Supply Obstructive sleep apnea (OSA) is a condition where the upper airway repeatedly collapses during sleep, causing breathing to stop briefly and oxygen levels to fall. During an apnea event, the body may experience low oxygen (hypoxia) and sudden surges in blood pressure when breathing resumes. Over time, untreated sleep apnea has many health effects, including on the eyes. Research shows that patients with glaucoma have a higher chance of having sleep apnea. For instance, one study found 20% of glaucoma patients screened positive for sleep apnea (higher than in similar people without glaucoma) (). A large meta-analysis reported that sleep apnea is signific Support the show

    12 min
  2. Economics of high-frequency home monitoring versus clinic-based perimetry

    2D AGO

    Economics of high-frequency home monitoring versus clinic-based perimetry

    This audio article is from VisualFieldTest.com. Read the full article here: https://visualfieldtest.com/en/economics-of-high-frequency-home-monitoring-versus-clinic-based-perimetry Test your visual field online: https://visualfieldtest.com Support the show so new episodes keep coming: https://www.buzzsprout.com/2563091/support Excerpt: Economics of High-Frequency Home Monitoring vs Clinic-Based Perimetry Glaucoma is a chronic eye condition that gradually shrinks side (peripheral) vision. It requires ongoing visual field testing (perimetry) to track disease progression and prevent vision loss. Traditionally, these tests are done in the clinic about every 6–12 months (). However, new home perimetry technologies (tablet apps or headsets) allow patients to test more often at home () (). Home testing could be much more convenient – saving travel and wait time – and might catch changes earlier. For example, in a remote-care model for glaucoma, patients saved an average of 61 travel hours compared to in-person exams (). Yet home tests also have costs (devices and data review) and performance uncertainties. Early reviews point out that while many home and portable perimeters are promising, their real-world accuracy and value still need validation (). Clinic-Based vs Home Perimetry Clinic perimetry is very reliable but requires specialized equipment (like a Humphrey Field Analyzer) and trained staff. It can be costly and burdensome – patients must take time off and possibly travel far for tests. In contrast, home monitoring offers comfort and flexibility. Patients can test on a personal tablet at home, often with simple apps that guide the procedure (). Users and eye doctors alike are optimistic: one UK study found patients and clinicians were cautiously positive about home glaucoma checks, citing potential convenience and cost-savings () (). In that study, most patients were able to use home devices regularly – 95% completed follow-up visits and 55% maintained ~80% or better adherence over 3 months (). However, home tests can be less controlled. For example, one trial of an iPad perimeter found about 44% of the unsupervised tests were flagged as unreliable (often due to distraction or fatigue), versus only 18% in the clinic (). Nevertheless, well-designed home tests have shown results closely matching clinic tests when done correctly. In fact, home testing had similar false-positive error rates to the clinic test (~14% in both cases) (). The bottom line is that home perimetry can free patients from some clinic visits (and save on travel and wait time) (), but it also depends on patient tech skills and diligence. Building Economic Models: Costs and Outcomes To compare home monitoring with clinic testing, researchers use decision-analytic models (often Markov models) that simulate patient health over many years () (). These models assign patients to vision states (no vision loss, moderate loss, severe loss) and simulate transitions between them each year. They tally up all costs (device, staff, clinic visits, treatments) and all health outcomes (measured in quality-adjusted life years or QALYs – a combination of length and quality of life). A QALY of 1 equals one year in perfect vision-health. For example, if home monitoring helps preserve vision and adds 0.1 QALY per patient (about 1.2 extra vision-quality months), and it costs an extra \$1,000 per patient, then the cost per QALY is \$10,000. Interventions below a country’s cost-effectiveness threshold (often \$50,000/QALY in the US or ~£20–30k in the UK) are generally considered good value () (). Key Factors in the Models Several real-world factors hugely affect the cost-effectiveness of home te Support the show

    15 min
  3. Color and contrast-specific perimetry to probe retinal ganglion cell subtype vulnerability

    3D AGO

    Color and contrast-specific perimetry to probe retinal ganglion cell subtype vulnerability

    This audio article is from VisualFieldTest.com. Read the full article here: https://visualfieldtest.com/en/color-and-contrast-specific-perimetry-to-probe-retinal-ganglion-cell-subtype-vulnerability Test your visual field online: https://visualfieldtest.com Support the show so new episodes keep coming: https://www.buzzsprout.com/2563091/support Excerpt: Introduction Vision relies on many kinds of retinal ganglion cells (RGCs), each tuned to different color or contrast signals. Standard visual field tests use white-on-white (achromatic) stimuli and measure overall sensitivity, but early or selective damage in diseases like glaucoma can hide behind normal full-field results. Specialized perimetry tests now probe specific pathways by using color or temporal contrast stimuli. For example, blue-on-yellow perimetry (Short-Wavelength Automated Perimetry, SWAP) presents a bright blue target on a yellow background to isolate the short-wavelength (blue) cone pathway and its small bistratified RGCs (). Similarly, red–green (chromatic) tests aim at the long-/medium-wavelength cone pathways (parvocellular system), and flicker/temporal tests (like frequency-doubling perimetry or high-frequency flicker) stress the large parasol (magnocellular) RGCs. By dissecting vision in this way, clinicians hope to catch damage in specific RGC subtypes earlier or more precisely than with white-on-white testing. This article reviews these color- and contrast-specific perimetry methods and how they relate to glaucoma and optic nerve disease. We discuss what blue-yellow and red-green perimetry can reveal about pathway dysfunction, how flicker perimetry examines temporal contrast processing, and how these functional losses map onto structural imaging (OCT) and blood flow metrics (OCT-Angiography). We also consider evidence on whether such targeted tests predict later decline on standard fields, and suggest practical testing protocols that maximize diagnostic insight without overly straining patients. Color- and Contrast-Specific Perimetry Blue–Yellow (SWAP) Perimetry Blue-on-yellow perimetry (SWAP) is a well-known color test. It uses a large, narrowband blue stimulus (around 440 nm) presented on a bright yellow background (). The high-luminance yellow field adapts the red and green cones so that the remaining pathway – the short-wavelength (blue) cones and their small bistratified RGCs – respond mainly. In effect, SWAP “isolates” the blue-cone channel. Early glaucoma often affects these small bistratified cells, so SWAP can reveal field loss sooner than conventional testing (). Indeed, studies report SWAP can detect visual field defects in glaucoma suspects or early glaucoma eyes before standard perimetry shows losses, suggesting higher sensitivity for early damage () (). For example, one study found SWAP deficits strongly correlated with retinal nerve fiber thinning (r≈0.56 in the inferior quadrant) in glaucoma patients (), indicating SWAP loss matches structural damage. However, SWAP has practical limitations. It is sensitive to lens opacity (cataracts make results unreliable) and generally requires longer testing (to overcome adaptation effects). Clinically, SWAP often uses a “SITA-SWAP” algorithm to shorten time, but patients may still fatigue easily. In research, SWAP fields have shown greater mean deficits than white-on-white fields in glaucoma suspects () (), but reproducibility can be an issue. Another SWAP-based approach measures pupil responses (pupillography) to blue vs yellow stimuli, reflecting melanopsin ganglion cell function. One study found blue-light pupillary tests detected early loss slightly better than yellow-light stimuli in mild g Support the show

    20 min

  4. 4D AGO

    Inequities in access to visual field testing and their outcome consequences

    This audio article is from VisualFieldTest.com. Read the full article here: https://visualfieldtest.com/en/inequities-in-access-to-visual-field-testing-and-their-outcome-consequences Test your visual field online: https://visualfieldtest.com Support the show so new episodes keep coming: https://www.buzzsprout.com/2563091/support Excerpt: Inequities in Access to Visual Field Testing and Their Consequences Visual field testing (also called perimetry) is a key tool eye doctors use to catch vision-threatening diseases like glaucoma early. In glaucoma, for example, people usually feel no symptoms until serious vision loss has occurred, so doctors rely on tests to measure the full field of a person’s vision (). Routine visual field tests help detect early damage to the optic nerve before it causes blindness. However, not everyone has equal access to these tests. In many parts of the country, people – especially those in rural areas or with low income – face barriers to getting regular eye exams and visual field tests. This article maps out how geography and socioeconomic factors affect who gets tested, how late disease is caught, and what can be done to close these gaps. Uneven Access Across Communities Geographic Barriers Living far from an eye clinic can make testing hard. A recent large study found glaucoma patients in isolated rural areas were far less likely to get the recommended follow-up eye exams than those in cities (). In fact, rural patients’ odds of receiving a needed optic nerve evaluation were 56% lower than urban patients (). Similarly, research of insured patients across the U.S. found wide variation by community in whether newly diagnosed glaucoma patients get any visual field test: in some places as few as 51% got tested within two years of diagnosis, while in others 95% did (). Some communities had over 25% of new glaucoma patients receive no visual field testing at all in the first two years after diagnosis (). These findings show that where a person lives – and the resources of that community – can make a big difference in whether they get basic vision testing. Socioeconomic and Insurance Factors Money matters too. Patients with lower income or without good insurance often get tested less. For example, one study showed that people on Medicaid (public insurance for low-income individuals) with glaucoma were much less likely to get visual field tests compared to patients with commercial insurance (). Only about 35% of Medicaid patients received a visual field test within 15 months of diagnosis, versus 63% of privately insured patients (). This means Medicaid patients were over three times as likely to get no glaucoma testing at all after diagnosis (). Because Medicaid patients are disproportionately low-income and include many racial minorities, these insurance disparities contribute greatly to unequal care. Racial and Ethnic Disparities Race and ethnicity intersect with income and location. Studies have found that Black, Hispanic, and Asian patients with glaucoma often receive fewer visual field tests than White patients, even after accounting for age and severity () (). For instance, Black and Asian glaucoma patients in one clinic-based study underwent about 3–5% fewer tests per visit than White patients, despite having more advanced disease at baseline (). Another analysis showed Black patients had a 17% lower chance of getting the recommended optic nerve exams than White patients, and Hispanic patients also lagged in follow-up visits (). These differences may reflect factors like lower insurance coverage, less access to Support the show

    12 min
  5. Low-Carb Diets and Nocturnal Blood Pressure Dips: Ocular Perfusion Risks and Benefits

    5D AGO

    Low-Carb Diets and Nocturnal Blood Pressure Dips: Ocular Perfusion Risks and Benefits

    This audio article is from VisualFieldTest.com. Read the full article here: https://visualfieldtest.com/en/low-carb-diets-and-nocturnal-blood-pressure-dips-ocular-perfusion-risks-and-benefits Test your visual field online: https://visualfieldtest.com Support the show so new episodes keep coming: https://www.buzzsprout.com/2563091/support Excerpt: Introduction Low-carbohydrate diets (such as ketogenic diets) have become popular for weight loss and blood sugar control. These diets can significantly improve metabolic health by lowering insulin, blood sugar, and even blood pressure () (). But for people with eye disease like glaucoma – especially the normal-tension type (NTG) – it is important to consider how major changes in diet and body chemistry might affect blood pressure patterns. In particular, doctors are paying attention to nocturnal hypotension (excessive night-time blood pressure drops) because the optic nerve is sensitive to low perfusion. Here we examine whether cutting carbs could alter the normal day-night blood pressure cycle and eye blood flow, and how to monitor these circadian changes safely. We will also weigh the potential benefits of better metabolic control against the risks of too-low blood pressure at night. Throughout, we rely on evidence from clinical studies and expert reviews () (). Low-Carbohydrate Diets and Blood Pressure Low-carb diets (for example, very-low-calorie or “keto” diets) can improve metabolic markers. They often lead to weight loss, better blood sugar control, and reduced insulin levels (). Multiple studies have found that switching to a low-carbohydrate diet tends to lower blood pressure as well. For instance, in a trial of overweight adults with high blood sugar, a very-low-carb diet lowered systolic blood pressure by nearly 10 mmHg on average over four months – a greater drop than with a standard DASH-style diet (). This effect is likely partly due to losing water weight and salt (since low-carb diets can cause an initial diuresis) and partly due to overall improved cardiovascular health. In fact, one review notes that keto-style diets are specifically recommended by diabetes experts because they improve blood pressure as well as glycemic control (). However, lowering blood pressure quickly can have side effects. When people start a ketogenic diet, many report what is colloquially called the “keto flu”: headaches, lightheadedness, and fatigue (). These symptoms are thought to come from temporary fluid and electrolyte shifts (for example, losing more sodium and dropping blood pressure). In practice, this means that some people on a strict low-carb diet may feel dizzy or unusually tired, especially in the first weeks. For patients already on blood-pressure medications, this added effect can increase the chance of excessive hypotension (too-low blood pressure), especially at night. In summary, low-carb diets often improve blood pressure long-term () (), but they can cause acute dips that should be monitored, especially in sensitive individuals. Nighttime Blood Pressure Dips and Eye Health Our blood pressure normally follows a day-night pattern: it dips during sleep and rises by morning. For most healthy people, night-time blood pressure falls by about 10–20% from daytime levels. This “nocturnal dip” is part of normal physiology. But exaggerated nocturnal dipping (for example, a drop much greater than 10–20%) can be risky for the eyes. The reason is ocular perfusion: the optic nerve and retina need a constant flow of blood. Ocular perfusion pressure (OPP) is roughly the difference between arterial blood pressure forcing blood into the eye and the pressure insi Support the show

    18 min
  6. Macronutrient Patterns and Intraocular Pressure: A Systematic Evaluation

    6D AGO

    Macronutrient Patterns and Intraocular Pressure: A Systematic Evaluation

    This audio article is from VisualFieldTest.com. Read the full article here: https://visualfieldtest.com/en/macronutrient-patterns-and-intraocular-pressure-a-systematic-evaluation Test your visual field online: https://visualfieldtest.com Support the show so new episodes keep coming: https://www.buzzsprout.com/2563091/support Excerpt: Diet and Eye Pressure: How Proteins, Fats, and Carbs May Affect Glaucoma Glaucoma is a leading cause of irreversible vision loss, usually caused by damage to the optic nerve often driven by high intraocular pressure (IOP) – the fluid pressure inside the eye. Lowering IOP is the main way to treat glaucoma, but eye pressure can be influenced by more than just medications. Recent research suggests that what we eat – especially the balance of proteins, fats and carbohydrates – may play a role in eye pressure and glaucoma health () (). In particular, certain dietary patterns (for example, low-carb or Mediterranean-type diets) have been linked to glaucoma risk and measures like nerve-fiber thickness and visual field loss. At the same time, scientists have begun to uncover biological pathways – from blood sugar and osmotic pressure to insulin effects and lipid signaling – that could explain how diet affects eye fluids and drainage. This article reviews the latest evidence on macronutrient patterns and glaucoma. We will survey epidemiologic studies of diet patterns (low-carbohydrate, low-fat, high-protein and Mediterranean-style diets) in relation to glaucoma, nerve thickness (the retinal nerve fiber layer), and vision loss. We will also explain possible mechanisms – including osmotic shifts from sugar, insulin’s effects on eye fluid, and the role of fats and lipid signals in the eye’s drainage mesh – that might link diet to IOP. Finally, we highlight gaps in the research (notably the lack of long-term trials) and suggest ways future studies can standardize diet tracking and glaucoma measures to get clearer answers. Dietary Patterns and Glaucoma: What the Studies Show Low-Carbohydrate Diets The idea of a low-carbohydrate diet (shifting calories from carbs to more protein and fat) has been widely studied for weight loss and diabetes, but does it affect glaucoma? A large U.S. study examined over 185,000 adults over decades and tracked their diets and glaucoma outcomes. That study found no overall link between long-term low-carb eating and the risk of primary open-angle glaucoma (). In other words, simply eating a low-carb or ketogenic-style diet did not clearly reduce (or increase) glaucoma risk in most people (). However, this same research did find an intriguing hint: if people substituted more vegetable-based fats and proteins (like plant oils, nuts, or beans) for carbohydrates, they tended to have a lower risk of a specific glaucoma pattern (one that affects central vision early) () (). In practical terms, swapping plants and healthy fats for carbs might modestly protect against one subtype of glaucoma () (). In contrast, sugary or high-glycemic carbohydrates seem to raise eye pressure acutely. For example, one Taiwanese health study measured people’s blood sugar two hours after a standard meal and compared it to eye pressure. They found that participants with higher post-meal blood glucose levels had significantly higher IOP – by several millimeters of mercury – than those with lower glucose (). Each rising quartile of after-meal sugar gave a clear trend of higher eye pressure (). This suggests that spikes in blood sugar (which happen with high-carb meals) can temporarily increase IOP. In fact, classic stu Support the show

    19 min
  7. Personalized Nutrition in Glaucoma: Nutrigenomic Interactions with Macronutrient Metabolism

    MAY 9

    Personalized Nutrition in Glaucoma: Nutrigenomic Interactions with Macronutrient Metabolism

    This audio article is from VisualFieldTest.com. Read the full article here: https://visualfieldtest.com/en/personalized-nutrition-in-glaucoma-nutrigenomic-interactions-with-macronutrient-metabolism Test your visual field online: https://visualfieldtest.com Support the show so new episodes keep coming: https://www.buzzsprout.com/2563091/support Excerpt: Introduction Glaucoma is a group of eye diseases that damage the optic nerve and can lead to vision loss if not treated. High intraocular pressure (IOP) – the fluid pressure inside the eye – is a major risk factor for glaucoma. Standard treatments (like eye drops and surgery) focus on lowering IOP. But growing research suggests that diet and nutrition may influence glaucoma risk and progression () (). For example, diets rich in vegetables (sources of nitric oxide/nitrates) have been linked to lower glaucoma risk () (). Personalized nutrition (or precision nutrition) is the idea of tailoring a person’s diet to their unique biology, including their genes and metabolism. The new field of nutrigenomics studies how genetic differences affect the way our bodies process nutrients (like fats and carbohydrates) and how these interactions impact health. In glaucoma, nutrigenomics could one day help us recommend the best balance of fats, carbohydrates, and proteins for each patient, based on their genes. This article explores how key genes involved in fat and carbohydrate metabolism (notably APOE, PPAR family genes, FADS, and NOS3) might guide personalized diets for glaucoma; how clinical trials could test such approaches; and what ethical and practical issues arise. Genes and Macronutrient Metabolism Certain genes play major roles in determining how our bodies handle fats and carbohydrates. Variants (different versions) of these genes can change metabolic pathways. In the context of glaucoma, several genes are of interest: APOE (Apolipoprotein E) – This gene makes a protein that transports cholesterol and fats in the body, especially in the brain and retina (). There are three common APOE variants (called ε2, ε3, ε4). People with the ε4 version tend to have higher blood cholesterol levels. In general nutrition science, APOE4 carriers often show larger cholesterol changes when they change their intake of saturated fats (). (For example, cutting saturated fat often lowers cholesterol more in APOE4 individuals than in others.) In glaucoma research, some studies even suggest APOE4 might protect the optic nerve from damage (), though the picture is complex. From a diet viewpoint, an APOE4 carrier might benefit especially from a low saturated-fat diet and increased healthy fats (in line with heart-healthy guidelines). PPARs (Peroxisome Proliferator-Activated Receptors) – These genes (especially PPARα and PPARγ) are regulators that turn on or off pathways controlling fat and sugar metabolism. The PPARγ gene has a well-studied variant called Pro12Ala. People carrying the “Ala12” variant often have greater sensitivity to different types of fat in the diet. For instance, one trial found that carriers of PPARγ Ala12 lowered their cholesterol and triglyceride levels more when their diet had a higher ratio of unsaturated fats (polyunsaturated/saturated fat) (). Another study showed that Ala12 carriers lost more weight on a Mediterranean-style diet rich in olive oil (a monounsaturated fat) than on a standard low-fat diet (). In short, PPAR variants influence how well someone responds to healthy (unsaturated) versus less healthy fats. For glaucoma patients with these PPAR variants, emphasizing om Support the show

    17 min
  8. Medium-Chain Triglycerides vs Long-Chain Fats: Rapid Ketosis and Visual Function

    MAY 8

    Medium-Chain Triglycerides vs Long-Chain Fats: Rapid Ketosis and Visual Function

    This audio article is from VisualFieldTest.com. Read the full article here: https://visualfieldtest.com/en/medium-chain-triglycerides-vs-long-chain-fats-rapid-ketosis-and-visual-function Test your visual field online: https://visualfieldtest.com Support the show so new episodes keep coming: https://www.buzzsprout.com/2563091/support Excerpt: Medium-Chain Triglycerides vs Long-Chain Fats: Rapid Ketosis and Visual Function Medium-chain triglycerides (MCTs) are fats with shorter carbon chains (mostly 8–12 carbons, like caprylic and capric acid) that are found naturally in coconut oil and breast milk. Long-chain fats (LCTs) include most other dietary fats (14+ carbons) such as olive or sunflower oil. The body handles them differently: MCTs go straight to the liver through the bloodstream and are rapidly turned into ketones (an alternative fuel), whereas LCTs enter via the gut’s lymph system and take longer to process. In one study, giving healthy adults pure C8 MCT oil caused blood ketone levels to jump roughly four times higher than the same calories of coconut oil^ (). In short, MCTs raise ketones much faster than LCTs. (Ketones are molecules the liver makes from fat that many cells – including brain and retina cells – can burn for energy when glucose is low.) MCTs have been studied for brain and eye health. In ageing and certain eye diseases, glucose uptake can drop and cells starve for fuel. For example, low brain glucose use in Alzheimer’s or ageing has led researchers to try ketone supplements to “bypass” this energy problem. One conclusion from a clinical trial was that optimizing MCT formulas might help counteract declining brain glucose use in aging (). In other words, ketones from MCT could provide extra energy when sugar isn’t enough. Similarly, these extra ketones may help visual processing and cognition when given acutely. In experiments, healthy adults who drank MCT oil (versus the same amount of olive oil) performed better on certain mental tasks – for example, one dose of MCT improved attention and decision-making in a Stroop-type test (). (Working memory also improved after 4 weeks of daily MCT compared to long-chain oil ().) These findings suggest that MCT-derived ketones can give the brain and eyes an energy boost, potentially speeding up cognitive-visual tasks. Importantly, glaucoma – a common disease of the optic nerve – involves energy failure in the retinal ganglion cells (RGCs) that carry vision signals. Research shows glaucoma is tied to metabolic and mitochondrial dysfunction (). RGCs are very active nerve cells with many mitochondria located near the optic nerve head (). They rely heavily on oxygen-based metabolism for ATP energy, so if mitochondria struggle (as can happen in glaucoma), RGCs get damaged. Because ketones can feed mitochondria, scientists are exploring if a ketogenic approach can help. Animal studies support this idea: In a mouse model of chronic glaucoma, feeding an 8-week ketogenic (very low-carb, high-fat) diet protected the RGCs and their axons. The ketogenic mice had more retinal mitochondria and better energy status and far fewer RGCs died, compared to control mice on a regular diet (). That study actually showed ketogenic diet “generated mitochondria, improved energy availability, … [and] protected RGCs” in the optic nerve (). Another recent glaucoma study found that ketones helped clear out damaged mitochondria (via mitophagy) in RGCs under stress, further protecting these cells (). How might ketones reach the nerves? In the optic nerve head, astrocytes (support cells) wrap around RGC axons and shuttle energy. Brain research shows astrocytes can both produce and export Support the show

    8 min
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About

Discover the latest science on glaucoma, vision, and longevity. Each episode explores evidence-based supplements for eye health, healthy aging, and lifespan extension. Original articles backed by real scientific research. All source links available at visualfieldtest.com, where you can also take a free visual field test online. Subscribe for weekly insights on glaucoma treatment, glaucoma prevention, vision supplements, and longevity research that could protect your sight and extend your healthspan.MEDICAL DISCLAIMER:This podcast is for educational and informational purposes only. It is not intended as medical advice, diagnosis, or treatment. The content presented should not replace professional medical consultation.Glaucoma is a serious condition that can lead to permanent vision loss. Never stop or modify prescribed treatments without consulting your ophthalmologist or healthcare provider.The supplements and research discussed are for informational purposes only. Individual results may vary, and supplements are not FDA-approved to treat, cure, or prevent any disease.Always consult a qualified healthcare professional before starting any new supplement regimen, especially if you have existing eye conditions or are taking medications.The visual field test available at visualfieldtest.com is a screening tool only and does not replace comprehensive eye exams by a licensed professional.

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