发明授权
US4289497A Gradient photochromic lens and method selectively reducing photochromic activity 失效
梯度光致变色透镜和方法选择性地降低光致变色活性

Gradient photochromic lens and method selectively reducing photochromic
activity
摘要:
A new gradient photochromic lens having a uniform resistance to fatigue is disclosed. A method for selectively reducing photochromic activity in one or more portions of a lens having a photochromic dye uniformly disposed across the surface thereof is also disclosed.
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