Common Defects of Human Eyes
Defects of Human Eyes
Far Sighted Vision:
In this defect image is formed behind the retina. The cornea and the lens cannot bend the light rays on retina. To treat this defect artificial lenses are used that bend the incoming rays on retina and form a clear image on retina.
Near Sighted Vision:
In this defect image is formed in front of the retina. To treat this defect concave lens is used that focus the light or retina.
In this defect a person cannot distinguish between green and red colours and is called colour blind.
1. First you need to pay attention to the screen parameters. Modern manufacturers produce e-readers with LCD (LCD) and E-lnk screens . The former can be colored or monochrome. ?? LCD screens are familiar to everyone, whereas e-lnk technology has arisen not so long ago. Such screens are free from harmful flicker. They do not affect the organs of vision. The image is formed here exactly like on a sheet of paper. Reflected light is created. At the same time, there is a small consumption of energy. The viewing angle in such books is 180 degrees. In LCD displays, it is only 160 degrees. In addition, the e-lnk faucet is insensitive to telephone radiation, vibrations of magnetic waves and static discharges.