Impaired vision may result from a deficiency of:
a. pyridoxine (vitamin B6). c. potassium.
b. retinol (vitamin A). d. cyanocobalamin (vitamin B12).
ANS: B
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A Incorrect: Vitamin B6 deficiency does not cause visual changes.
B Correct: Retinol is important to normal eye function.
C Incorrect: Potassium deficiency does not cause visual changes.
D Incorrect: Vitamin B12 deficiency does not cause visual changes.
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