Certified Ophthalmic Assistant Practice Exam

The distance from the cornea to the back surface of the spectacle lens is the

1. apex distance

2. lens distance

3. vertex distance

4. optic distance

The correct answer is: vertex distance

The distance from the cornea to the back surface of the spectacle lens is referred to as the vertex distance. This distance is important to consider when prescribing corrective lenses to ensure proper vision correction for the patient. Options A, B, and D are not the correct terms used to describe the distance from the cornea to the back surface of the spectacle lens. The apex distance typically refers to the distance from the back surface of a lens to the apex of the cornea. The lens distance is a vague term and not commonly used in ophthalmic practice. The optic distance typically refers to the distance from the front surface of the cornea to the fovea in the retina.