Soft contact lenses with partial occlusion for prolonged lateralization of visual input

Techniques for prolonged lateralized presentation of visual material using specially designed contact lenses have been devised but with limited applicability. We have been able to manufacture soft contact lenses which occlude either the right or left visual field by applying a commercially available dye to the relevant portion of the lens. The resultant field defect was confirmed electrophysiologically. The lenses would appear to have numerous applications in experimental psychology in the study of cerebral asymmetries.