SUNGLASSES

100% Ultraviolet Protection

Sunglasses meet three exacting criteria: 100% ultraviolet protection, even under the harsheet sunlight;carefully balanced visible light absorption with maintained colour recognition;and reduced infra-red rays.

The Function of Lens Colour

The human eye is not equally sensitive to all colours in the spectrum. Nor does it focus on colours in a uniform way. Consequently, the colour of lenses and their spectral transmittance is carefully balanced to maintain clear and comfortable vision.
Green, Grey, brown and amber-brown lenses have been proven by scientists and other optical experts to be the most compatible with human vision.

Wavelength Good sunglasses must take account of the human eyes' colour sensitivity which rises  from 0% at the extreme of the violet area of the spectrum, peaks in the green area and drops again at the infra-red wavelenghts.

Green and Grey lenses are defined as colour neutral. By absorbing colours evenly across the visible light spectrum all colours are seen with their true values.

Short wavelength blue light is easily scattered by moisture and dust. This causes haziness or flat. By reducing blue transmittance. Sunglasses cut through haze and improve contrast.

Brown and amber-brown lenses enhance contrast by absorbing a higher proportion of blue light.

How Dark?

To be effective in bright conditions, sunglass lenses should absorb atleast 65% of light. In fact, 85% absorption is the optimum level for general outdoor wear. Under extreme conditions, up to 95% absorption my be required.

Some Facts About Ultraviolet

The sun emits a broad spectrum of Electro-magnetic energy ranging from cosmic rays at one end to radio waves at the other Ultraviolet rays fall just outside the visible part of the spectrum. Although invisible,ultraviolet can be harmful to the eye just as it is to the skin. Long term exposure can cause cataract and even blindness. Concentrated short term exposure can cause a painful irritation of the cornea known as Keratitis or snow blindness.
Ultraviolet is most intense at higher altitudes where the earth's atmosphere is thinner. But even at sea-level, when there is a risk of sunburn to the skin, there is a corresponding risk of ultraviolet exposure to the eyes. Reflective surfaces such as snow, sand and water can increase the ambient level of ultraviolet by as much as 80%.

Sunglasses are made of optical glass, scientifically formulated to provide glare control and to enhance vision. They check ultraviolet rays and reduce the level of infra-red (heat) rays. They also selectively filter colors to maintain high contrast levels.
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The invisible ultraviolet (UV) rays may have both short term and long term harmful effects on the eye UVB rays of ultraviolet can cause painful irritation of the cornea and lifelong exposure can lead to cataracts and even blindness.

All  Sunglasses are guaranteed to provide 100% ultraviolet protection.