Night Blindness
Night Blindness is a genetic disorder in which the sufferer has trouble seeing at night. Two things cause this disorder in general. The first cause is a lack of vitamin A which helps develop the retina and vision receptor cells. Vision receptor cells consist of cones and rods, cones for bright light and rods for less light. When there is a vitamin A deficiency, the rod cells don’t develop properly. The second cause is a genetic inheritance. Night blindness is a sex-linked disorder because the X-chromosome was found to be different than normal in people with the disorder.
There are many vision-related effects this disorder can have on a person. In most cases, the person isn’t completely blind in dark areas, but sees things a lot darker than they really are. In other cases, it takes the person’s eyes much longer than normal to adjust to different light settings. For example, if a person with night blindness suddenly has the lights turned off in front of them, it may be up......
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