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  2. Martin–Schultz scale - Wikipedia

    en.wikipedia.org/wiki/Martin–Schultz_scale

    Martin-Schultz scale. The Martin–Schultz scale is a standard color scale commonly used in physical anthropology to establish more or less precisely the eye color of an individual; it was created by the anthropologists Rudolf Martin and Bruno K Schultz in the first half of the 20th century.

  3. Martin scale - Wikipedia

    en.wikipedia.org/wiki/Martin_scale

    The original Martin scale, summarized below, consists of 16 colors (from light blue to dark brown-black) that correspond to the different eye colors observed in nature due to the amount of melanin in the iris. The numbering is reversed in order to match the Martin–Schultz scale, which is still used in biological anthropology. In this case ...

  4. Eye color - Wikipedia

    en.wikipedia.org/wiki/Eye_color

    Eye color is an inherited trait determined by multiple genes. [14] [15] These genes are sought by studying small changes in the genes themselves and in neighboring genes, called single-nucleotide polymorphisms or SNPs. The total number of genes that contribute to eye color is unknown, but there are a few likely candidates.

  5. The Rarest Eye Color in the World: What It Is and Why

    www.aol.com/lifestyle/rarest-eye-color-world-why...

    Your eye color is determined by the amount and distribution of melanin in the iris of the eye. And of course, the genes we inherit from our parents play a significant role in determining our eye ...

  6. What your eye color says about you

    www.aol.com/lifestyle/2014-06-10-what-your-eye...

    RELATED: See what your eye color says about you. What your eye color says about you. Show comments. Advertisement. Advertisement. Holiday Shopping Guides. See all. AOL.

  7. Why your hair and eye colors change

    www.aol.com/news/2014-07-23-why-your-hair-and...

    Melanin is the protein that creates skin, eye and hair color. More melanin means darker eyes, hair or skin. The color of the melanin in the eyes is determined by three other genes, EYCL1, 2 and 3.

  8. Eye chart - Wikipedia

    en.wikipedia.org/wiki/Eye_chart

    An eye chart is a chart used to measure visual acuity comprising lines of optotypes in ranges of sizes. Optotypes are the letters or symbols shown on an eye chart. [ 1 ] Eye charts are often used by health care professionals, such as optometrists , physicians and nurses , to screen persons for vision impairment .

  9. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    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 .