NBEO Physiological Optics Practice Test

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If an RGP lens is fitted flatter than the cornea, the lacrimal lens power is which sign?

Plus

Minus

The tear film between the cornea and a rigid lens acts as a tiny lens whose power depends on how the lens curvature compares to the cornea. If the RGP lens sits flatter than the cornea, the tear layer forms a divergent, or minus, lens. That mismatch causes light to spread out more between the surfaces, reducing convergence. So the lacrimal (tear) lens power becomes negative.

Zero

Uncertain

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