More names below are a form of protective eyewear designed primarily to prevent bright sunlight and high energy visible light from damaging or discomforting the eyes.
Visual light transmittance sunglasses.
The higher the vlt percentage is the lighter the lens tint will be.
Visible transmittance is a whole window rating and takes every component into consideration from the frame to the glass.
Light transmission light transmission is the percentage of light that passes through the lens and reaches the eye.
The lower the vlt the darker the sun lens will be.
When deciding which kind of lenses to purchase a good place to start is with the visible light transmission vlt.
The new labeling requirements for these are based on the transmittance value.
This is measured as a percentage which indicates the darkness of a lens within a sunglasses frame.
They can sometimes also function as a visual aid as variously termed spectacles or glasses exist featuring lenses that are colored polarized or darkened.
In terms of numbers and range vt is measured on a scale of 0 1 with 0 being the lowest amount of light passing through and 1 being the highest amount.
Lens category 0 zero 100 80 transmittance not sunglasses fashion spectacles very low reduction of sun glare and some uv protection.
This is termed the luminous transmittance.
Visible light transmission is the amount of visible light that can pass through an optical or sun lens.
Sunglasses or sun glasses informally called shades or sunnies.
It can also be called visible light transmittance or vlt.
The amount of light that reaches your eyes through your lenses is called visible light transmission vlt.
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.
Being a percentage they run from 0 black as night to 100 clear as day.
Higher vlt percentage lenses will allow for more light to travel through the lens that will then hit the eye.
Vlt visual light transmission visual light transmission is the percentage of light allowed to pass through a lens.