name any two defects of vision which can be corrected by using spectacles.
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Following are the eye diseases that cannot be corrected by using lens:
1. Cataract-opaqueness of eye lens[causes temporary blindness]
2. Glaucoma-increase of pressure of vitreous humour of eye- may lead to temporary blindness
3. Retinopathy[destruction of retina- may cause permanent blindness]
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