Nutrition and the eye Flashcards
What effect does Ginkgo biloba have on eyes?
In humans it increased end diastolic flow velocity in the ophthalmic artery.
- One study also showed visual field improvement in patients with normal tension glaucoma (not confirmed)
What effect does caffeine have on pressure?
Caffeine has an overall 2-3 mmHg increase of ocular pressure over 2-3 hours
T/F: Aqueous humor has 14 times the concentration of Vitamin C compared to blood
True
What did Blue Mountains Eye Study found on the relationship between multivitamins and cataracts?
Blue Mountains Eye Study found that long-term use of daily multivitamins protected against the development of nuclear and cortical cataracts
What is the relationship between Vitamin C supplements and cataracts?
Vitamin C supplements 10 years or greater were 45% less likely to require cataract surgery
What are the findings on lutein and zeaxanthin intake and risk of cataracts surgery?
A high dietary intake of lutein and zeaxanthin (caratonoids) yielded a 22% reduction in risk for cataract surgery. (The Nurses’ Health Study)
What are some factors associated with cataract formation?
- Diet
- Environmental factors
- Exposure to sun
- Radiations
- Age
- Medical conditions- like diabetes
- Use of systemic/topical medications
What is the major cause of blindness- that accounts for more than 50%?
Age related macular degeneration (AMD)
What are the major risk factors for AMD?
Age
Family history
Smoking
What natural antioxidants are present in the eye as a protection to dry AMD?
Vitamin C
Zeaxanthin
Meso-zeaxanthin
Leutin
Name three natural protections against AMD?
Antioxidants
Pupils get smaller with age
yellowing of the lens (cuts out blue light)
High beta carotene on patients with history of smoking is associated with what risk?
Greater chance of lung cancer.
Blue Mountain eye study- found that above median intake ofBeta carotene, Vitamin-C, Vitamin-E and Zinc may lead to what percentage reduction of risk for AMD?
35% reduced risk of AMD
