KROK 1 2023 – Question 56 · KROK (Medicine) · Pharmacology
A patient presents with impaired twilight vision. What vitamin preparation should be prescribed to this patient?
- A. Ascorbic acid
- B. Pyridoxine hydrochloride
- C. Nicotinic acid
- D. Cyanocobalamin
- E. Retinol acetate
Hint
Rod photoreceptors need the visual pigment rhodopsin, whose chromophore is derived from a fat-soluble vitamin, so poor dim-light vision points to a deficiency of that vitamin.
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