If the trial frame scale at the apex of the cornea reads as the white 5 mm (closer), what is the vertex distance?

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Prepare for the Vision Rehabilitation Test with detailed study material, flashcards, and multiple-choice questions to enhance your understanding. Each question is designed to provide depth, with hints and explanations to get you ready for success!

Multiple Choice

If the trial frame scale at the apex of the cornea reads as the white 5 mm (closer), what is the vertex distance?

Explanation:
Vertex distance is the distance from the back surface of the lens to the corneal apex. In a trial frame, the apex scale shows how the lens sits relative to the eye compared with a standard reference distance (about 15 mm). If the scale indicates the lens is 5 mm closer than that reference, you subtract 5 from 15, giving a vertex distance of 10 mm. So the vertex distance is 10 mm.

Vertex distance is the distance from the back surface of the lens to the corneal apex. In a trial frame, the apex scale shows how the lens sits relative to the eye compared with a standard reference distance (about 15 mm). If the scale indicates the lens is 5 mm closer than that reference, you subtract 5 from 15, giving a vertex distance of 10 mm. So the vertex distance is 10 mm.

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