| 摘要 |
The present invention teaches a method for making a photochromic ultraviolet protective shield. The UV blocking eyewear uses a material which changes color when exposed to UV radiation. The obtained visible color is directly proportional to the intensity of ultraviolet light impinging the material. The photochromic ultraviolet protective shield is made by adjunction of photochromic compounds to a host polymer matrix. Incorporation of photochromics into a polymeric matrix involves the technique of injection molding, extrusion molding or cell-casting. This invention will offer the advantages i) to protect the eye or the face by absorbing the dangerous ultraviolet rays such as UV laser radiation ii) to reduce glare and squinting of the eye by automatically darkening in sunlight.
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