Visible Light Transmission (VLT)

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When deciding which kind of lenses to purchase, a good place to start is with the visible light transmission (VLT). The higher the VLT percentage is, the lighter the lens tint will be. Higher VLT percentage lenses will allow for more light to travel through the lens that will then hit the eye. Alternatively, lenses with a lower VLT percentage will have a darker tint and will block more light from coming through to the eye.

Consider the typical conditions in which you will be wearing your glasses or goggles most often. See below for a guide to help you determine which VLT is most suitable for your needs. If you feel that multiple categories apply, it might be beneficial to choose an interchangeable or photochromatic style which will accommodate a broad range of light conditions.

Please note that regardless of the VLT, all Optic Nerve and ONE by Optic Nerve lenses feature 100% UV protection to protect your eyes from harmful UV rays. This includes our clear lenses. Shop our full collection here.



Lens Tint

Suitable for...

80 - 100%


None or Very Light Tint

For aesthetic, fashion, or comfort purposes or for use during nighttime

43 - 80%


Light Tint

Weak levels of sunlight

18 - 43%


Medium Tint

Average to low levels of sunlight

8 - 18%


Dark Tint

For use in strong sunlight, including intensified light which is reflected off water or snow

3 - 18%


Very Dark Tint

For use in exceptional levels of strong sunlight (not suitable for drivers and road users)