Astigmatism is a common and generally treatable imperfection in the curvature of the eye that causes blurred distance and near vision.

Astigmatism occurs when either the front surface of the eye (cornea) or the lens inside the eye has mismatched curves. Instead of having one curve like a round ball, the surface is egg-shaped. This causes blurred and distorted vision at all distances

This video is representative of -5.00 which is very high astigmatism.

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