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In response to the Coronavirus outbreak and in accordance with CDC guidelines, King Eye Associates will be operating for essential services only. The office will still be open Monday, Tuesday, Thursday, and Friday from 10 A.M. – 5 P.M. for eye-care emergencies. If you are in urgent need of a pair of glasses or contact lenses, please contact our office at 215-335-3555 for additional information. Our onsite optical laboratory can manufacture most prescription glasses the same day. Email office@kingeyeassociates.com for further information.

Located on Frankford Ave, a few stores down from Cottman Ave in Philadelphia

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Home » Eyeglasses » Prescription Eyeglasses » Photochromic Lenses

Photochromic Lenses

Photochromic lens technology has been around for over 40 years. Photochromic lenses change from clear to dark based on the intensity of UV radiation. Remove the source of UV radiation from the lenses, and they return to their clear state.

The amount of photochromic reaction (how much a lens darkens) depends upon the intensity of the UV radiation present, combined to a lesser extent with the current temperature of the air. That means photochromics adjust automatically to indoor and outdoor light conditions. Photochromic lenses automatically adjust to outdoor lighting conditions by providing the right level of tint, and return automatically to their clear state; both indoors and at night. Learn more about polycarbonate lenses.

Watch a short video on photochromic lenses:

Special thanks to the EyeGlass Guide, for informational material that aided in the creation of this website. Visit the EyeGlass Guide today!