Pinhole can reduce refractive error up to -: (A) 3 D, (B) 1 D, (C) 5 D, (D) 10 D
Answer is A. Pin-hole test: It helps in confirming whether the optical correction in the trial frame is correct or not.
An improvement in visual acuity while looking through a pinhole indicates that optical correction in the trial frame is incorrect.
PPinholecan reduce refractive error upto 3 D.