AST Surgical Technologist Practice Exam 2026 - Free Surgical Tech Practice Questions and Study Guide

Question: 1 / 400

The avascular, clear portion of the eye covering the iris is the:

Pupil

Sclera

Iris

Cornea

The clear, avascular portion of the eye that covers the iris is known as the cornea. This structure serves several critical functions: it allows light to enter the eye, helps focus that light onto the retina, and provides a protective barrier against dirt and germs. Unlike the sclera, which is the opaque white part of the eye, the cornea is transparent, enabling it to efficiently transmit light.

The cornea's lack of blood vessels is essential for maintaining its clarity, as any blood vessels in this area could obstruct vision. Instead, it receives nourishment from the tear fluid and the aqueous humor, a clear fluid found in the front part of the eye. Understanding the unique characteristics of the cornea, including its role in vision and protection, is fundamental in the study of ocular anatomy and functions.

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