7th answer plse

Dear student
a) Cataract - lens turns opaque. In this defect, the crystalline lens becomes milky and cloudy. This causes partial or complete loss of vision. 
b) Astigmatism - Vision becomes distorted when the surface of the cornea has an uneven curvature. 
c) Dry eyes - deficiency of vitamin A can lead to complete blindness or dying corneas, which are characterized by marks called Bitot's spots.
d) Presbyopia (Ageing vision defect) - is a common defect of vision, which generally occurs at old age. A person suffering from this type of defect of vision cannot see nearby objects clearly and distinctively. 
e) Myopia (short sightedness) - is a defect of vision in which a person clearly sees all the nearby objects, but is unable to see the distant objects comfortably and his eye is known as a myopic eye.  
f) Hypermetropia (Long sightedness) - is a defect of vision in which a person can see distant objects clearly and distinctively, but is not able to see nearby objects comfortably and clearly.
Regards

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