Effectivity of the Randwal Interferometer IRAS vs. the Mentor Guyton-Minkowski Potential acuity Meter in rigid gas permeable fittings of patients with less than optimum visual acuity

Abstract

Patients presenting with acuities of less than 20 20 warrant special consideration in any practice. If the reduction in acuities is suspected to be due, in part, to a substantial refractive error or corneal disruption, contact lenses may be an option to improve vision. Instruments that predict the potential acuity of the retina have long been available. The most common application of these instruments is determining the final acuity if a cataract were to be extracted. This paper explores two commonly used retinal integrity tests, PAM ∗ ∗ 0PAM is a registered trademark for the Mentor Guyton-Minkowski Potential Acuity Meter, and IRAS refers to the Randwal Interferometer. and IRAS ∗ , and their application in predicting acquity after successful fitting of rigid contact lenses. Both instruments adequately predicted acquity in over one-half of the subjects by being in error by only one line of acuity. However, the PAM seemed to have greater accuracy.