Pemphigus vulgaris. Pemphigus vulgaris Pemphigus is a rare skin disorder characterized by blistering of your skin and mucous membranes. The most common type is pemphigus vulgaris, which involves painful sores and blisters on your skin and in your mouth.
This is a new technology of tinting the optical lenses, with the tint darker for the upper part of the prescription lens, and the tint gradually becoming lighter for lower part of the lens. This arrangement makes the wearer more at ease by enjoying the better sunshade as well as the better vision acuity seeing through the lower part.
Even if a grey lens is letting in the same percentage of light as a copper lens, the grey lens will feel darker. Your brain will translate contrast as brightness. Rose provides great contrast on low-light or cloudy days. Photochromic lenses adjust for varying light conditions. Photo Brown will provide more contrast that Photo Grey, but you will probably not have this option unless you are purchasing Rx lenses. Amber or Brown polarized lenses will help you find your ball on the bottom of a pond.