ICO Visual Sciences Practice Questions - ICO Visual Sciences Examination (Part A) Exam

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The cornea provides about two-thirds of the eye's total refracting power. The single most important reason the cornea refracts so strongly is:

Its high refractive index relative to the lens The large difference in refractive index between air and the corneal surface Its thickness compared with the lens Its rich nerve supply

Correct Answer:

The large difference in refractive index between air and the corneal surface

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