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Having lower levels of lutein and zeaxanthin within the macula may be associated with an increase in the risk of age-related macular degeneration. [105] Lutein and zeaxanthin act as antioxidants that protect the retina and macula from oxidative damage from high-energy light waves. [ 106 ]
The specific vitamins and minerals in AREDS-1 are vitamin C (500 mg), zinc (80 mg), vitamin E (400 IU), copper (2 mg) and beta-carotene (15 mg). In the AREDS-2 formulation, lutein (10 mg) and zeaxanthin (2 mg) replaced beta-carotene due to the risk of lung cancer in smokers taking beta-carotene. [ 2 ]
The average daily intake of β-carotene is in the range 2–7 mg, as estimated from a pooled analysis of 500,000 women living in the US, Canada, and some European countries. [21] Beta-carotene is found in many foods and is sold as a dietary supplement. [8] β-Carotene contributes to the orange color of many different fruits and vegetables.
A reference value above which visual acuity is considered normal is called 6/6 vision, the USC equivalent of which is 20/20 vision: At 6 metres or 20 feet, a human eye with that performance is able to separate contours that are approximately 1.75 mm apart. [9] Vision of 6/12 corresponds to lower performance, while vision of 6/3 to better ...
A Snellen chart is an eye chart that can be used to measure visual acuity.Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor Franciscus Cornelius Donders.
Identified risk factors include low dietary calcium or phosphorus, magnesium, zinc, boron, iron, fluoride, copper, vitamins A, K, E and C (and D where skin exposure to sunlight provides an inadequate supply). Excess sodium is a risk factor. High blood acidity may be diet-related, and is a known antagonist of bone. [47]
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