Ophthalmic OpticsQuestion 12 of 100
Vertex distance is the measured space between what two points?
a.The two pupils
b.The back of the lens and the front of the cornea
c.The frame front and the temple
d.The optical center and the segment
Explanation
Vertex distance is the distance from the back surface of the lens to the front of the eye (cornea). It matters most for higher-powered prescriptions where a change alters effective power.
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