The clear benefit of surgery for vitreous haemorrhage is the rapid clearance of vitreous blood and accelerated restoration of vision. Surgery for retinal detachment is important to prevent loss of central and/or total vision in the eye, or to restore vision when it has been lost. The degree of improvement in vision from surgery will be dependent on multiple factors including the degree of irreversible damage to the retina or other structures from diabetes or other co-existing conditions. Approximately 65% of patients gain 2 lines of visionor more on reading charts.