It May be a photo chromatic glass..take the glass in sunlight if the lenses change colour from being transparent to black then its a photo chromatic glass for sun protection
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Disclaimer : The content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.
Eye and vision
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