Sunglass Outlet Blog

The Right Lenses
The proper sunglass lens should block nearly all UV light and greatly reduce harmful infrared rays. They will also eliminate glare and bring the visible light down resulting in all day comfort on the eyes.

Light Transmission
The amount of light that goes through the lenses and reaches our eyes is light transmission.  The optimal light transmission range for sunglasses is 10% to 30%. So a lens with a light transmission of 20% would allow 20% of light to pass while blocking the 80%.

How the sunglasses will be used is most important.  On average most people do not need lenses rated less than 10%. A very dark lens may keep out more light but as conditions change, say driving in and out of dark shaded areas, visibility can be dropped to zero.

UV Transmission
For outdoor, direct sunlight activties it is always good to block at least 95% of UV light. Lower UV blockage is acceptable while driving as windshields will absorb some harmful light.

Optical Quality
The optical quality means the lens is distortion free. Non-Optical lenses create eye-straining distortions as opposed to optical lenses, the lines reflected in these lenses will follow in straight lines and through the even contours of the lens.