Certified Ophthalmic Medical Technologist (COMT) Practice Exam

What condition can arise from excessive pressure applied to the cornea during A-scan measurements?

1. Corneal abrasion

2. Increased intraocular pressure

3. Unintended refractive myopia

4. Visual distortion

The correct answer is: Unintended refractive myopia

The condition that can arise from excessive pressure applied to the cornea during A-scan measurements is unintended refractive myopia. When excessive pressure is applied, it can temporarily deform the corneal shape, leading to a change in the eye's optical properties. The cornea plays a crucial role in focusing light onto the retina, and any alteration in its curvature can affect the overall refraction of the eye. If the cornea becomes steeper or its shape is altered due to the pressure, this can result in a shift toward myopia, or nearsightedness, where distant objects appear blurred while close objects remain clear. This phenomenon emphasizes the importance of proper technique during ocular measurements to minimize pressure on the cornea, as it highlights how mechanical force can directly impact vision quality. Maintaining appropriate pressure levels is essential in clinical practices when performing A-scan ultrasound biometry or any procedure involving direct contact with the cornea.