Prisms are shaped to bend light in a specific direction, and can be used to correct problems with eye alignment, such as double vision, or to help people with visual field loss use their remaining vision more effectively. Prisms can be prescribed by an eye doctor that specializes in neuro optometric rehabilitation as part of a comprehensive treatment plan for PTVS and other vision problems, and can be used in conjunction with other therapies, such as medications, physical therapy, vision therapy, or low vision aids, to help optimize visual function and improve quality of life.