Night blindness after jejunoileal bypass surgery.

A 53-year-old woman developed night blindness 9 years after jejunoileal bypass surgery. Abnormal rod function was confirmed by dark-adapted electroretinography, and vitamin A deficiency was confirmed by low serum levels of vitamin A and carotene. Administration of oral vitamin A supplementation resulted in complete resolution of the patient's symptom and return of the electroretinogram to normal. Based on this case and the four previously reported cases, we suggest that jejunoileal bypass patients be routinely questioned about decreased night vision. Patients with this complaint should undergo thorough ophthalmic evaluation. Dark-adapted electroretinography or dark adaptation testing should be done to establish the presence of abnormal rod function, and serum levels of vitamin A or carotene should be obtained to identify the cause. It is important to identify vitamin A-deficient patients because of their potential to develop permanent impairment of night vision.