BLU+V is a new ophthalmic lens material setting a new standard in ultraviolet light blocking. BLU+V completely blocks UV and blue light to 415nm with the secondary benefit of reducing blue violet light through to 450nm.
Why is it important?
BLU+V offers 100% blocking of light of wavelengths up to 415nm. This compares to CR39, for example, with a cut-off some 50nm further down the spectrum. With most mid and high index lens materials failing to achieve a complete block at 400nm, BLU+V offers unrivalled protection between 380 and 420nm wavelengths. As can be seen from the transmittance curve in figure 1, a further bonus with BLU+V is that it also blocks more than 25% of blue light at 435nm.
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