(a) List three common refractive defects of vision. Suggest the way of correcting these defects. (b) About 45 lac people in the developing countries are suffering from corneal blindness. About 30 lac children below the age of 12 years suffering from this defect can be cured by replacing the defective cornea with the cornea of a donated eye. How and why can students of your age involve themselves to create awareness about this fact among people?
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a. myopia , hyperopia and presbyopia.
myopia is corrected by a concave lens while hypermetropia needs a convex lens. A presbyopian patient uses a bifocal lens.
b. students can involve themselves in such awareness programs and make aware people of the ill effects of the defects.
myopia is corrected by a concave lens while hypermetropia needs a convex lens. A presbyopian patient uses a bifocal lens.
b. students can involve themselves in such awareness programs and make aware people of the ill effects of the defects.
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