US scientists have identified two genes responsible for macular degeneration, the gradual deterioration of eyesight in the elderly that can lead to blindness, a study showed this week.The research published 24 April 2007, in the Journal of the American Medical Association also showed that smoking and being overweight carry a strong risk of the condition, in which the central part of the eye's retina degenerates.
Video Ad Feedback
Your brain on déjà vu
Ever experienced déjà vu? CNN's Sanjay Gupta explains what's happening in your brain when it occurs.
2:08 • Source: CNN
Your Health 8 videos
US scientists have identified two genes responsible for macular degeneration, the gradual deterioration of eyesight in the elderly that can lead to blindness, a study showed this week.The research published 24 April 2007, in the Journal of the American Medical Association also showed that smoking and being overweight carry a strong risk of the condition, in which the central part of the eye's retina degenerates.
Video Ad Feedback
Your brain on déjà vu
2:08
Now playing
• Source: CNN
Marcello00.png
Inside the viral world of peptides
7:46
Now playing
• Source: CNN
thumb_22844243_942895.193_thumb.jpg
Video Ad Feedback
Cyclosporiasis patient describes how illness ruined her honeymoon
1:16
Now playing
• Source: CNN
thumb_22836858_73406.861_thumb.jpg
Video Ad Feedback
Public health official on rapidly expanding cyclosporiasis outbreak
1:34
Now playing
• Source: CNN
measles offit still.jpg
Video Ad Feedback
Dr. Paul Offit: 'No,' the US cannot still claim to have measles elimination status
1:31
Now playing
• Source: CNN
thumb_22821062_28069.452999999998_thumb.jpg
Video Ad Feedback
False positive test creates cyclosporiasis confusion
1:21
Now playing
• Source: CNN
meg.png
Video Ad Feedback
Trump’s funding cuts created ‘the perfect storm’ that slowed the government’s cyclosporiasis response
3:40
Now playing
• Source: CNN
Screenshot 2026-07-16 at 2.13.23 PM.png
Video Ad Feedback
Canadian wildfire smoke brings dangerous air quality to more than 100 million people in the Midwest and Northeast
2:57
Now playing
• Source: CNN