Certified Ophthalmic Assistant Practice Exam 2025 - Free Ophthalmic Assistant Practice Questions and Study Guide

The estimation of anterior chamber depth is done by shining a penlight from the side of the patient's eye. This technique helps in visualizing the depth of the anterior chamber, which is the space between the cornea and the iris. By shining the light from the side, the examiner can observe the position of the structures within the eye and assess the depth accurately.

Options A, B, and C are incorrect because:

- Shining the penlight directly on the cornea, pupil, or retina would not accurately estimate the anterior chamber depth. The best visualization is achieved by illuminating the eye from the side to observe the spatial relationship between the cornea and iris.