A patient's eye examination reveals limited central vision. The nurse would conduct further assessment for problems with which structure?
1. Sclera
2. Lens
3. Macula
4. Extraocular muscles
3
Rationale 1: The sclera is the outer protective layer of the eyeball that helps maintain its shape. Changes in the sclera would not specifically affect central vision.
Rationale 2: The lens is the focusing structure of the eye. Dysfunction of the lens would cause problems with all vision, not just central vision.
Rationale 3: The center of the retina, called the macula, is where the greatest numbers of cone receptors are located for central and color vision.
Rationale 4: The extraocular muscles move the eyeball. They help the patient fixate on an object but are not associated with central vision.
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