A black tangent screen intended for assessing the extent of the patient's peripheral visual field by mapping the visual response to a test object moved from the periphery towards the centre of the screen. It typically consists of a series of concentric circ...
A tangent screen designed for manual testing of extra ocular muscle function (i.e., strabismus). It typically consists of a series of lines (Hess coordinates) configured in small sections in a curved pin-cushion pattern (i.e., the middle of the lines is clo...