Hyperopia and myopia are also called far sightedness and near sightedness. In hyperopia people have difficulty in seeing near objects but can see the far objects clearly whereas in myopia people who have difficulty in seeing distant objects but can see near objects clearly. In color blindness the people having difficulty in viewing red, blue, green or mixture of these colors. It is caused due to absence or malfunction of certain color-sensitive cells in the retina.
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Last date updated on July, 2020