Question

Explain in detail about the pinhole and its usage in optometry

Answer 1

Answer:

A pinhole occluder is an opaque disk with one or more small holes through it, used by ophthalmologists, orthopedists and optometrists to test visual acuity. ... Because light passes only through the center of the eye's lens, defects in the shape of the lens (errors of refraction) have no effect while the occluder is used