<prompt> Cylindrical glass is used for:PresbyopiaHigh myopiaHypermetropiaAstigmatism  <response>: Ans. d AstigmatismRef: A.K. Khurana 6th ed. 142-43, Harrisons 19th ed. 195 Astigmatism is a type of refractive error which arises due to irregular curvature of cornea. Correction of astigmatism is done by using cylindrical lens. 