Astigmatism is due to-
Ans. (d)Ref: Khurana optics 2/e, p. 79; Parsons 22/e, p. 52Most common cause of astigmatism is abnormalities of curvature of cornea. It is usually congenitalLenticular astigmatism is rare, seen in lenticonus (cone shaped lens), congenital tilling, oblique placement, traumatic subluxation of lens
Irregularity of curvature of cornea
Irregularity of curvature of lens
Forward displacement of the lens
Irregularity of curvature of cornea > Irregularity of curvature of lens
Elementary Optics