The cover/ uncover test is performed at near using a flashlight as a target. Shining a light in the patient's eye allows the orthoptist to observe their corneal reflection. When the eyes are straight the corneal reflections will be located centrally in each pupil. When the patient has a deviation one corneal reflection will be in the centre of the pupil and the other reflection will be on or close to the iris. When detecting a manifest deviation the Orthoptist covers the straight eye if a deviation is apparent or the eye with the better VA. Observe the behaviour of the uncovered eye.