Ophthalmic OpticsQuestion 26 of 100
A photochromic lens changes tint in response to what?
a.Blue light from screens
b.Ultraviolet (UV) radiation
c.Temperature only
d.Polarized reflections
Explanation
Photochromic lenses darken when exposed to ultraviolet light, which is why they may not darken fully inside a car whose windshield blocks UV. They lighten again when UV exposure decreases.
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