Reduced visual acuity ie worse than 6/6, may be due to ocular disease or blurring due to uncorrected refractive error. A pinhole only allows central rays of light to pass through and these rays do not require refraction (focussing) by the eye.
Reduced visual acuity ie worse than 6/6, may be due to ocular disease or blurring due to uncorrected refractive error. A pinhole only allows central rays of light to pass through and these rays do not require refraction (focussing) by the eye.