The index of refraction inside the eye in the Reduced Eye model is which value?

• A. 1.333
• B. 1.4
• C. 1.0
• D. 1.5

Answer: (A)

In the Reduced Eye model, the interior of the eye is treated as a single homogeneous medium with a refractive index close to that of water. The aqueous and vitreous humors in the eye have indices around 1.336, so using 1.333 is a convenient and accurate approximation for simple paraxial calculations. This internal index is chosen to reflect the actual light path within the eye while keeping the math straightforward, rather than using the external air value or the higher indices of specific structures like the cornea or lens. Therefore, the index of refraction inside the eye in the Reduced Eye model is about 1.333.