Video-Camera Vision: Transient Monocular Diplopia

To the Editor: A myopic but otherwise healthy 42-year-old man had unilateral monocular diplopia after prolonged use of a portable video camera outdoors in bright sunlight. The symptoms were limited to the left eye, with two well-focused and equally prominent images displaced vertically to a small extent in the center of the visual field. These two images were seen even when the right eye was covered. Placing a card across the lower half of the left pupil obliterated one of the images; similarly, covering the upper half of the pupil obliterated the other. Vision returned to normal within 18 hours . . . No extract is available for articles shorter than 400 words.