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Minbu · 28-07-2005, 21:37

You need to make sure the lenses have both UVA and UVB protection.

UVB rays are the ones that burn the skin and can damage the eyes. Although not all experts agree, there is some research that suggests that daily exposure to UVB in very bright sunlight over a period of many years may cause cataracts, a gradual clouding of the lens of the eye.

UVA rays are primarily absorbed within the lens of the human eye, though there are no documented disorders of the human eye from UVA.

Standards for lenses place limits solely on UVB and UVA rays, but bear in mind that these are voluntary, not mandatory. According to these standards, lenses must block at least 70% of UVB and at least 60% of UVA. To best protect your eyes, look for lenses that provide at least 98% protection from both UVA and UVB rays.

(Taken from: http://www.allaboutvision.com/sunglasses/spf.htm)

28-07-2005, 21:37	#8
Minbu Inactive Join Date: Feb 2005 Location: Derby Services: VM TV & BB, BT phone Posts: 157	Re: UV Light PROTECTION You need to make sure the lenses have both UVA and UVB protection. UVB rays are the ones that burn the skin and can damage the eyes. Although not all experts agree, there is some research that suggests that daily exposure to UVB in very bright sunlight over a period of many years may cause cataracts, a gradual clouding of the lens of the eye. UVA rays are primarily absorbed within the lens of the human eye, though there are no documented disorders of the human eye from UVA. Standards for lenses place limits solely on UVB and UVA rays, but bear in mind that these are voluntary, not mandatory. According to these standards, lenses must block at least 70% of UVB and at least 60% of UVA. To best protect your eyes, look for lenses that provide at least 98% protection from both UVA and UVB rays. (Taken from: http://www.allaboutvision.com/sunglasses/spf.htm)