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VLT (Visible Light Transmission) is a measurement that quantifies the percentage of visible light that passes through a sunglass lens and reaches the wearer's eyes. A higher VLT number means a lighter lens. A lower VLT number means a darker lens.
read more about vlt in sunglasses ...VLT is used to place lenses into standard categories (0 to 4). For example, a lens with a VLT of 50 percent is a Category 2 tint, suitable for moderate sun. A VLT of 12 percent is a Category 3 tint, suitable for bright sunlight.
VLT is more important than the color of the lens because it is an objective measure of protection from glare and brightness. A lens can be bright blue or dark gray, but the VLT tells you exactly how much light is being blocked for visual comfort.
For bright sunlight and general outdoor activities, a VLT between 8 percent and 18 percent (Category 3) is considered ideal. For overcast days or partly cloudy conditions, a VLT between 18 percent and 43 percent (Category 2) is suitable.
VLT helps you select protective sunglasses that match your contact lens needs. Choosing the correct VLT reduces eye strain in bright environments, which makes sure your contact lenses stay comfortable and irritation-free during outdoor activity.
No, VLT measures only visible light. UV protection is a separate quality and must be rated as 100 percent UV blocking.
A clear lens has a VLT close to 100 percent, meaning almost all visible light passes through.
No, a lower VLT is better for bright sun, but using a very low VLT (Category 4) in normal daylight can be dangerous for driving.
Visible Light Transmission (VLT) is key for specific eye conditions. If you have early-stage macular degeneration, your doctor may recommend a specific VLT percentage to manage light intensity without sacrificing the detail needed for safe mobility.
National Eye Institute. Macular Degeneration (nei.nih.gov). 2024.
The Vision Council. Understanding VLT (thevisioncouncil.org). 2023.
Review of Optometry. Low Vision and Tint Selection (reviewofoptometry.com). 2024.
AAO. Sunglasses and Eye Health (aao.org). 2024.