Eye Exams Detect Alzheimer's Disease Years Before Symptoms Appear
Dr. Joseph Mercola - Take Control of Your Health
Briana Mercola
4.6 • 1.6K Ratings
🗓️ 1 October 2025
⏱️ 7 minutes
🧾️ Download transcript
Summary
- More than 7 million Americans live with Alzheimer's today, and researchers project that number will rise to 13 million by 2050, doubling the burden on families
- Researchers at the Jackson Laboratory (JAX) discovered twisted, narrowed retinal vessels in mice carrying a common gene mutation, showing changes that resemble early Alzheimer's signs years before memory decline begins
- They also found disrupted protein activity in both brain and retina, weakening energy production and vessel support, creating the conditions for Alzheimer's long before symptoms appear
- Visual sensitivity testing in over 8,000 adults predicted dementia risk up to 12 years ahead, showing how everyday vision struggles may signal hidden brain changes
- Regular eye exams, better sleep, balanced carbohydrates, healthy fats, sunlight exposure, and methylene blue support offer practical steps to strengthen vessel health and protect your brain
Transcript
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| 0:00.0 | Are you overlooking the first signs of Alzheimer's every time you sit in the optometrist's chair, |
| 0:05.0 | even years before memory problems begin? |
| 0:08.0 | Welcome to Dr. Mercola's cellular wisdom. |
| 0:12.0 | Stay informed with quick, easy-to-listen summaries of our latest articles, perfect for when you're on the go. |
| 0:17.0 | No reading required. Subscribe for free at Mercola.com for the latest health insights. |
| 0:21.9 | Hello and welcome to Dr. Mercola's cellular wisdom. I'm Ethan Foster. Today we're focusing on |
| 0:29.6 | what your eyes can reveal about future dementia risk and why a routine retinal exam may be one of the most practical early warning tools you have. |
| 0:38.3 | I'm Alara Sky. |
| 0:40.3 | We're drawing on new research showing that the retina and the brain age in lockstep. |
| 0:44.3 | When your eyes blood vessels twist, narrow, or branch abnormally, |
| 0:49.3 | those same patterns may be unfolding in your brain, |
| 0:52.3 | long before you notice confusion or forgetfulness. |
| 0:56.0 | Researchers at the Jackson Laboratory examined mice carrying a common mutation called |
| 1:01.1 | M-T-H-F-R-67C greater than T and saw tangled retinal vessels, narrowed arteries, and reduced branching as early as six months of age. |
| 1:13.6 | Up to 40% of people carry a similar variant. |
| 1:16.6 | Because the retina shares tissue traits with your brain, |
| 1:19.6 | the team proposes that those retinal changes can act as a visible biomarker of Alzheimer's risk years in advance. |
| 1:26.6 | The pathology wasn't only vascular. |
| 1:29.7 | The researchers also found disrupted protein activity in both retina and brain, machinery that |
| 1:35.4 | powers energy production, clears cellular waste, and stabilizes vessel structure. When that |
| 1:41.7 | protein work falters, energy weakens, debris builds, and vessel integrity |
| 1:46.4 | slips, creating conditions in which Alzheimer's can take root long before cognitive symptoms |
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