The nurse notes that a client is unable to control the amount of light that enters the eye. The dysfunction of which structure is the most likely cause of this problem?
1. Cornea.
2. Sclera.
3. Conjunctiva.
4. Iris.
Correct Answer: 4
The iris responds to the light coming through the cornea by making the pupil larger or smaller, thereby controlling the amount of light that enters the eye. The cornea is the window of the eye. It is the clear, transparent part of the sclera and forms the anterior one sixth of the eye. The sclera supports and protects the structures of the eye. The conjunctiva protects the eye and produces a lubricating fluid that prevents the eye from becoming too dry.
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