Question

The image of a distance point object appears as a line on the retina due to___ .

Answer 1

Astigmatism is a common and treatable refractive defect in the curvature of the eye that produces impaired distant and close vision.

1. When the front surface of the eye (cornea) or the lens inside the eye has uneven curves, astigmatism arises.
2. Lines in one plane of an item appear to be in focus, while lines in another plane appear to be out of focus.