US Patent 7584630 Photochromic ocular devices

Described are photochromic ocular devices such as contact lenses and intraocular lenses made of an organic polymeric material and at least one photochromic material capable upon exposure to actinic radiation to change from a less ultraviolet radiation absorbing unactivated form to a more ultraviolet radiation absorbing activated form. The photochromic ocular device is capable upon exposure to actinic radiation to exhibit a ratio of greater than 0.5:1.0 of increased ultraviolet radiation absorbance to increased visible radiation absorbance as measured in the Ultraviolet Photochromic Performance Test described herein.