Activity and diabetic vitreous hemorrhages.

To ascertain the relationship between activity and vitreous hemorrhage, we questioned 72 consecutive diabetic patients presenting with 95 episodes of vitreous hemorrhage. The activity most commonly associated with symptoms of hemorrhage was sleep (36%) followed closely by sitting or lying (26%). Only one of six hemorrhages was associated with activity that could be considered more strenous than walking. Limiting the activity of diabetic patients does not seem an effective method of preventing vitreous hemorrhage.