Question

what do you mean by astigmatism ​

Answer 1

Hey mate here is your answer!!!!

Astigmatism is a common vision problem caused by an error in the shape of the cornea. With astigmatism, the lens of the eye or the cornea, which is the front surface of the eye, has an irregular curve. This can change the way light passes, or refracts, to your retina. This causes blurry, fuzzy, or distorted vision.

Hope it helps to you!!!

Answer 2

In this defect I cannot see focus object both in horizontal and vertical lines clearly.