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A Category 3 sun tint is a standardized classification for sunglass lenses based on visible light transmission (VLT). Lenses in this category transmit 8 percent to 18 percent of visible light. They block a significant amount of light, making them suitable for most sunny conditions.
read more about category 3 sun tint ...Category 3 is the standard because it provides the best balance of darkness and clarity for general use. It is dark enough to be comfortable in bright sunlight, such as at the beach or driving on a sunny day, without being too dark for normal viewing.
The categories range from 0 to 4. Category 0 transmits 80 percent to 100 percent of light (clear or very light tint). Category 4 transmits 3 percent to 8 percent of light. Category 4 lenses are the darkest and are only suitable for extreme conditions, such as high-altitude mountaineering.
VLT, or Visible Light Transmission, is the measurement used to set the category. A Category 3 tint has a low VLT, meaning only a small percentage of light passes through the lens. The VLT determines the category, not the color of the tint (like gray or brown).
If you wear contact lenses and rely on sunglasses for eye protection, Category 3 is the best all-purpose tint. It protects your eyes from strain in bright light, making sure your contact lenses stay comfortable during outdoor activity.
Yes, Category 3 sunglasses are safe and suitable for daytime driving.
The Category 3 classification refers only to the tint darkness. The lens can be polarized or non-polarized.
No, Category 3 lenses are far too dark for safe night driving or low-light conditions.
Category 3 lenses transmit only 8% to 18% of light. If you find your vision is too dark even in bright sunlight, or if you struggle with contrast, ask your doctor for a "high-contrast" Category 2 tint which may be safer for your specific visual needs.
ISO 12312-1:2022. Eye and Face Protection - Sunglasses (iso.org). 2024.
AAO. Choosing the Best Sunglasses (aao.org). 2024.
AOA. Light Sensitivity and Tinting (aoa.org). 2024.
The Vision Council. Sunglass Performance Guidelines (thevisioncouncil.org). 2024.