Does the pinhole test’s hole improve visual acuity in keratoconus?

07 Dec Does the pinhole test’s hole improve visual acuity in keratoconus?

“Floaters” are not caused by LASIK, PRK, or for that matter, IOL surgery for cataracts. Nevertheless, this can be a common complaint from patients. Why is that?

The pinhole test uses a 1.0 mm hole in an opaque disk to determine how much of a visual problem is due to a “refractive error” rather than ocular pathology (like cataract or macular degeneration). It works by limiting the oncoming rays of light to the narrow, diffractive rather than refractive level (like nearsightedness and astigmatism). It definitely works in keratoconus as well where even the refractive error can be distorted and so cannot be fully corrected with glasses.