Which of the following is/ are contrast sensitivity testing chas?: (A) Pellirobsons, (B) Snellen type cha, (C) Regan cha, (D) All of the above
Answer is D. Ans. is d i.e., All of the above Contrast Sensitivity Testing is done with the help of following chas: Pelli-Robson cha The Regan cha StandardSnellen-type