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Effects of ultraviolet blocking CLs

Lenses
Professor James Wolffsohn summarises recent evidence highlighting the importance of good ultraviolet light protection for contact lens wearers

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Not all contact lenses block most ultraviolet light, but does this matter and what advice should we give to our patients?

Much of the shorter wavelength UV light emitted from the sun (UVC and UVB) is absorbed by the atmosphere.1 However, some UVB and UVA make it to the ocular surface and are linked with anomalies, the most familiar being pinguecula, pterygia and carcinomas.2 The crystalline lens absorbs most of the remaining UV light by adulthood and UV is well recognised as a risk factor for cataract as a result.3

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