Panoptxx question.
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Joined: Apr 2008
Posts: 1,014
Likes: 3
From: Plano, TX
Tv is visible transmission of light.
Light Transmission
Light Transmission is the percentage of light that passes through the lens and reaches the eye. Most optical experts agree that the best light transmission range for sunglasses is from 10% to 30%. For example, a lens with a visible light transmission of 20% allows 20% of the light to pass through the lens, blocking the other 80%.
When selecting sunglasses, consider how they will be used. Most people do not need lenses rated less than 10%. While driving, for example, lenses that are too dark can cause visibility problems when driving from very bright conditions into shady-dark areas; driving into a tunnel could cause complete loss of vision. Some people can become "addicted" to dark lenses and find they cannot tolerate even moderate glare without dark glasses.
UV Transmission
For outside activities in direct sunlight, sunglasses should block at least 95% of UV light. For driving, higher UV transmission levels are acceptable, since the windshields on most cars will block some of this harmful light.
Light Transmission
Light Transmission is the percentage of light that passes through the lens and reaches the eye. Most optical experts agree that the best light transmission range for sunglasses is from 10% to 30%. For example, a lens with a visible light transmission of 20% allows 20% of the light to pass through the lens, blocking the other 80%.
When selecting sunglasses, consider how they will be used. Most people do not need lenses rated less than 10%. While driving, for example, lenses that are too dark can cause visibility problems when driving from very bright conditions into shady-dark areas; driving into a tunnel could cause complete loss of vision. Some people can become "addicted" to dark lenses and find they cannot tolerate even moderate glare without dark glasses.
UV Transmission
For outside activities in direct sunlight, sunglasses should block at least 95% of UV light. For driving, higher UV transmission levels are acceptable, since the windshields on most cars will block some of this harmful light.
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