With Spectacle Lenses, there is a wide range of available features. New technologies has brought us a range in lens power that is virtually unlimited. However, not all available features are right for all of our patients. As such, we provide you with a brief discussion of each of these features so when you visit our office you will have some ideas of what features might work best for you. We will discuss aColor Tinted Sunglassesll of these and how they fit your needs.
Fixed Tints Sunglasses
Children & Sunglasses
Yellow Lenses and Hunters
Hunters tend to like yellow or orange lenses since they increase contrast during the daybreak hours or twilight hours. During those hours the sun is at its greatest angle with the earth and therefore light passes through a denser atmosphere. As such, light is more bluish during those hours. As this bluish light passes through a yellow lens, the blue wavelength is filtered out and only the remaining colors can go through. Since the blue light can’t get through the lens, blue objects appear to be darker or even black. That increases contrast against all the other colors.
Transitions & Photogray
Transition and Photogray lenses change with the light. Light from the sun contains ultra-violet wavelengths (over 700 nm). It is the ultra-violet that creates a change in the chemistry of the lens. This change causes the lens to darken. Transition refers to plastic light weight lenses. Photogray refers to glass lenses. Both of these photosensitive lenses block over 95% of the ultra-violet rays. When indoors, and out of the effect from sunlight, the lenses lighten up nearly perfectly clear. When in your car, the lenses are only about 25% dark due to the fact that the car windshield blocks about 50% of the UV. Transitions come in two densities. If you prefer clear lenses when you are indoors, the traditional Transitions lens is best for you. However, if you are sensitive to bright light and prefer a comfortable light tint indoors and you want moderate darkening in the car, then you should use Transitions XTRActive.
Hard Coat Finish
A hard coat finish is a coating of silica particles that are baked on the surface of the lenses. This finish resists scratches and nicks. This hard coat finish is baked on the front and the back surface of both lenses. Over a period of time, the hard coat finish will reduce scratches by approximately 75%.