CBSE Class 10 Answered

All correct vision habits; shifting, central fixation, relaxation … natural eyesight improvement activities remove astigmatism.

Shifting on round objects; a ball, globe, circle keeps the eye and cornea in its normal healthy, round, even shape for correct focus of light rays onto the eyes retina.

The astigmatism wheel tests for astigmatism. 

Shifting, tracing on the lines, circles on the wheels helps to remove astigmatism.

See wheel diagrams. By looking at the lines as said, people can be cured from astigmatism.