This lens has a strong yellow color. The effect is to make everything brighter and in sharper focus. Because the eye focuses different colors in different places, eliminating portions of the spectrum allows the eye to focus more sharply. The increased visibility is because the yellow color is in the portion of spectrum that is most comfortable for the eye. The lens has applications in sports, shooting, driving and at times of low visibility.
Blue light is the dominant component of skylight and a major cause of glare.
Aging and a number of ocular conditions can make eyes extremely sensitive to what is normally seen as moderate glare, and these same pathological conditions also increase the possibility of veiling glare caused by blue light scatter within the eye. These colors have the characteristic of darkening green colors while increasing the brightness of reds, yellows and blues. They have applications in sports like golf where the white ball is highlighted against the fairway. Deep shades of purple are used to detect diseases and other problems in plant life. See BPI Gardeners Glasses.