Certified Ophthalmic Technician (COT) Practice Test 2025 - Free COT Practice Questions and Study Guide

Retinitis pigmentosa is least likely to affect the accuracy of Goldmann tonometry because this condition primarily impacts the retina and peripheral vision, rather than influencing intraocular pressure readings, which the tonometry measures. Goldmann tonometry relies on a flat surface applanation on the cornea to determine the pressure inside the eye, and while retinitis pigmentosa may lead to other visual impairments, it does not inherently alter the mechanics of how the eye responds to the pressure measurement.

In contrast, diabetic retinopathy may involve changes in the retinal vasculature that could influence the overall eye structure and potentially the reliability of measurements. Cataracts can cause light scattering, which may affect the quality of the examination or the ability to perform the procedure effectively, while glaucoma is often associated with changes in the optic nerve and may involve treatments that can alter intraocular pressure. Therefore, retinitis pigmentosa remains the most unrelated condition regarding the accuracy of Goldmann tonometry readings.