This is optometry for those whom normal spectacles or contact lenses are inadequate for their daily visual needs.
Various eye diseases and conditions may result in excessively blurred vision, blind spots or peripheral visual field loss.
Special testing leads to demonstration of strong optical magnifiers and other aids to enhance remaining sight.
Also available are electronic magnifying systems and even reading machines.
Often different solutions are required for each task such as reading, hobbies, TV and shopping.