Question

write various defects of vision of human eye and their cause.

Answer 1

1. myopia (short sightedness) -lens become too short, lengthened from  back to front
2. hyperopia (long sightedness)-lens becoming too long, shortened from back to front
3. presbyopia-lens loses flexibility
4. astigmatism- uneven curvature of cornea
5. colour blindness-lack of cone cells in retina
6. night blindness- rod cells may not be synthesised in dim light

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