After jejunoileal bypass surgery for morbid obesity, metabolic complications including a nutritional amblyopia developed in a patient. Reanastomosis of the bypass and treatment with multivitamins resulted in a nearly complete return of vision. Any patient undergoing rapid weight loss after gastrointestinal surgery for morbid obesity should be followed up for possible decrease in vision. If nutritional amblyopia develops, immediate reversal of the previous surgery is indicated.