Certified Ophthalmic Technician (COT) Practice Test 2026 - Free COT Practice Questions and Study Guide

The correct choice is laser interferometry, which is a specialized optical measurement technique that can be used to assess visual acuity without being influenced by opacities in the optical media, such as cataracts or corneal scars. By utilizing the principles of interference, laser interferometry allows for the evaluation of visual performance by providing clear images directly to the retina, making it effective for patients with optical media defects.

While other tests are also used to measure visual acuity, they rely on clear optical pathways. The Snellen chart, for instance, requires unobstructed vision, making it less suitable for individuals with significant media opacities. The contrast sensitivity test assesses the ability to distinguish between variations in light and the presence of an object in different lighting conditions but does not specifically accommodate for defects in the ocular media. Retinoscopy involves observing the reflex of light from the retina but can be affected by any opacities present in the media during the process. Thus, laser interferometry stands out as the most appropriate method for this particular evaluation.