What does VLT stand for in sunglasses?

what does VLT stand for in sunglasses?

VLT stands for Visible Light Transmission. Put simply, it is the percentage of light that the lenses allow through to your eyes.

A sunglasses lens with a VLT of 20% allows 20% of light to pass through filtering out the other 80%.

You should always consider the VLT when you are choosing the best sunglasses for your activity.

  • The best sunglasses for bright conditions will typically have a VLT of 10-15% and blue, green or gray lens colors.
  • Sunglasses that can be worn in both full sunlight and shady conditions like on a deck or verandah have a VLT of between 15-25% and have a variety of different lens colors.
  • And sunglasses that are for specialist activities, like fly fishing in low light conditions should have a VLT of between 25 and 40% and usually have either yellow or copper color lenses.


  • Rick Wallace is a passionate angler and fly fisher whose work has appeared in fishing publications including FlyLife. He is a regular on fly fishing podcasts and appeared in the international fly fishing film Predator.

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