Prandial presbyopia.

Loss of accommodation amplitude during eating (prandial presbyopia) is a rare phenomenon that has been reported in only 1 patient who had had head trauma. We report 2 patients who had not had head trauma and whose accommodative amplitudes, measured by dynamic retinoscopy, became markedly diminished within 1 minute of starting a meal and did not recover for 55-60 minutes. Apart from this abnormality, there appeared to be no autonomic or other neurologic dysfunction. The cause of this isolated disturbance in these patients is a mystery.