IJCAHPO Certified Ophthalmic Assistant (COA) Practice Exam

Which part of the eye is primarily responsible for focusing light?

Cornea Lens Iris Retina

Correct Answer:

Lens

Explanation:

Light entering the eye is bent most by the cornea, which acts as the eye’s main focusing surface. Its curved shape provides the majority of the optical power needed to form a sharp image on the retina. The lens behind the iris then provides additional focusing and, importantly, can change shape to adjust focus for objects at different distances (accommodation). The iris only controls how much light enters by changing pupil size, not the focusing itself. The retina receives the focused image and contains the photoreceptors that detect it. So the part primarily responsible for focusing light is the cornea.

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