Visual Light Transmittance Sunglasses

It can also be called visible light transmittance or vlt.

Visual light transmittance sunglasses.

This is measured as a percentage which indicates the darkness of a lens within a sunglasses frame. In other words this is how dark a pair of sunglasses will be. Most optical experts agree that the best light transmission range for sunglasses is from 10 to 30. Vlt visual light transmission visual light transmission is the percentage of light allowed to pass through a lens.

Lens category 0 zero 100 80 transmittance not sunglasses fashion spectacles very low reduction of sun glare and some uv protection. They can sometimes also function as a visual aid as variously termed spectacles or glasses exist featuring lenses that are colored polarized or darkened. Visible transmittance is a whole window rating and takes every component into consideration from the frame to the glass. Sunglasses or sun glasses informally called shades or sunnies.

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. The new labeling requirements for these are based on the transmittance value. The transmission rate also called transmittance is a percentage given which describes the amount or rate of sunlight that will go through the lenses of your sunglasses and into your eyes. 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.

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. Lenses with 22 transmittance allow 22 of light rays to pass through them to your eye. The lower the vlt the darker the sun lens will be. The higher the vlt percentage is the lighter the lens tint will be.

When deciding which kind of lenses to purchase a good place to start is with the visible light transmission vlt. This is termed the luminous transmittance. Being a percentage they run from 0 black as night to 100 clear as day. Visible light transmission is the amount of visible light that can pass through an optical or sun lens.