This section contains 967 words (approx. 4 pages at 300 words per page) |
Sight is a complex process that results when visible light, a narrow band of the electromagnetic spectrum between 400 and 700 nanometers (nm), is converted into signals that can be interpreted by the brain. This process involves special light-sensitive cells called photoreceptors that are located in the retina, a thin structure that lines the inside of the eye. These cells capture packets of light, called photons, and transform their energy into signals that are transported from the eye to the occipital cortex, the portion of the brain that allows us to interpret these signals as sight.
Normal human color vision is trichromatic (based on the perception of three primary colors) and requires three types of photoreceptor cells, called cones, each of which contains a different photopigment. Each photopigment
CLASSIFICATION AND INCIDENCE OF COLOR VISION DEFECTS | ||
Color Vision | Inheritance | Incidence Male Population Percent) |
I. Hereditary | ||
Trichromats | ||
1. Normal | 92.0 | |
2. Deuteranomalous | XR... |
This section contains 967 words (approx. 4 pages at 300 words per page) |