| May be worn 10-30 minutes daily to strengthen and give the eyes a healthy workout. Hundreds of tiny apertures admit only parallel light. The retina is thus allowed to focus while the eye muscles relax. While looking through pinholes, vision is remarkably clearer. The Bi-Level wire rim styling features a bi-level or bi-focal, slightly larger hole pattern for more rigorous exercise - the bottom half has twice as many holes as the top. |
