Teaching DSSSB TGT Mock Test 2025 Biology Health and Disease Diseases

An eye defect 'Astigmatism' occurs when:

1
the cornea is not spherical in shape.
2
the image of an object is focussed at a point behind retina.
3
the image of an object is focussed at a point before retina.
4
the eye lens becomes cloudy.
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