Which type of lens material has the highest index of refraction?

Study for the NBEO Physiological Optics Test. Prepare with flashcards and multiple-choice questions, each question has hints and explanations. Ace your exam!

Multiple Choice

Which type of lens material has the highest index of refraction?

Explanation:
The main idea is how strongly a lens material bends light, which is determined by its refractive index. A higher index means light slows more and bends more when entering the material, allowing thinner lenses for the same prescription. Among common ophthalmic lens materials, polycarbonate has the highest refractive index, around 1.586. CR-39 is about 1.498, Trivex is near 1.532, and ophthalmic crown glass is typically around 1.523. So polycarbonate bends light the most for a given wavelength, making it the highest index choice among these options.

The main idea is how strongly a lens material bends light, which is determined by its refractive index. A higher index means light slows more and bends more when entering the material, allowing thinner lenses for the same prescription.

Among common ophthalmic lens materials, polycarbonate has the highest refractive index, around 1.586. CR-39 is about 1.498, Trivex is near 1.532, and ophthalmic crown glass is typically around 1.523. So polycarbonate bends light the most for a given wavelength, making it the highest index choice among these options.

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