Fundoscopy is commonly used by non-ophthalmologists to screen for diabetic retinopathy.1 The sensitivity of fundoscopy through a dilated pupil for detecting diabetic retinopathy is twice as high as detection through an undilated pupil,2 but surveys of general practitioners have found that only 1 in 250 regularly dilate pupils, even when assessing patients at high risk of diabetic eye disease.3 A common reason for not dilating pupils is concern about the risk of precipitating acute angle closure glaucoma.3 How big is this risk?