Diagnosis of Retinal Detachment Indirect ophthalmoscopy with pupillary dilation Retinal detachment should be suspected in patients, particularly those at risk, who have any of the following: Sudden increase or change in floaters Photopsias Curtain or veil across the visual field Any sudden, unexplained loss of vision Vitreous hemorrhage that obscures the retina Indirect ophthalmoscopy shows the retinal detachment and can differentiate the subtypes of retinal detachment in nearly all cases.