The nurse is reviewing in age-related changes in the eye for a class. Which of these physiologic changes is responsible for presbyopia?
Decreased adaptation to darkness
Loss of lens elasticity
Decreased distance vision abilities
Degeneration of the cornea
The Correct Answer is B
A. Decreased adaptation to darkness: This change is related to decreased rod function but is not responsible for presbyopia.
B. Loss of lens elasticity: Correct. Presbyopia is caused by the age-related loss of elasticity in the lens, which reduces the ability to focus on near objects.
C. Decreased distance vision abilities: This may occur with other conditions like myopia but does not cause presbyopia.
D. Degeneration of the cornea: This can affect vision but is not responsible for presbyopia.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Pretibial edema: Edema is more indicative of venous function, not arterial function.
B. Palpate pedal pulses bilaterally: Palpation of the pedal pulses is essential to assess arterial circulation in the lower extremities.
C. Allen test: This assesses arterial blood flow to the hand, not the lower extremities.
D. Homan sign: Homan sign is used (though controversial) to assess for deep vein thrombosis (DVT), which is related to venous, not arterial, function.
Correct Answer is D
Explanation
A. Constipation: This involves hardened stool in the colon, causing localized distention but no free fluid.
B. Splenomegaly: Enlargement of the spleen causes a palpable mass in the left upper quadrant but no free fluid.
C. Distended bladder: This causes suprapubic distension but does not produce a fluid wave.
D. Ascites: A positive fluid wave test indicates free fluid in the abdominal cavity, a hallmark sign of ascites. The test is performed by tapping one side of the abdomen and observing for a wave-like transmission of fluid to the opposite side.
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