Which term describes a simplified model of the eye used to analyze optical properties?

• A. Vitreous humor
• B. Schematic eye
• C. Reduced (equivalent) eye
• D. Image formation

Answer: (C)

A simplified optical model of the eye lets you analyze how light forms an image on the retina without getting bogged down in every anatomical detail. The reduced (equivalent) eye is the best term for this approach because it compresses the eye’s complex optics—cornea, lens, and internal media—into a single refracting element with an effective focal length, placed so the image lands on the retina. This makes it straightforward to use basic ray optics to relate object distance, focal power, and retinal image location, and to study properties like magnification and dioptric power.

The vitreous humor is the gel filling inside the eye, not a modeling term. The schematic eye is another simplified model that keeps more anatomical structure, but the reduced (equivalent) eye specifically denotes collapsing the system into a single effective element for easy optical analysis. Image formation describes the outcome of the optics, not the modeling framework.