Bagolini striated lenses

A diagnostic tool used to assess binocular vision, retinal correspondence, and suppression. The lenses have fine, parallel striations that cause a point light source to appear as a line perpendicular to the striations. When placed with the striations at 135° before the right eye and 45° before the left eye, a patient with normal binocular vision will perceive two lines crossing to form an “X.” Variations in the perceived image can help diagnose conditions such as suppression and anomalous retinal correspondence.