A photochromic lens automatically adjusts to the brightness of the sun. Silver particles embedded in the lens material are triggered by UV light to darken when solar radiation increases and lighten when sunlight fades. The result is that your glasses have a much wider range of application into lower light conditions; overcast, fog, morning and early evening. This process adjusts quickly and never wears out. If you go out and use it in a wide variety of light conditions with the same pair of glasses, photochromicity is highly desirable.

Question

Examsnet · Accepted Answer

Correct Answer is : Be it in the brightness of the sun or in lower light conditions such as overcast, fog, morning and early evening, photochromic glasses are the best bet for your eyes.

NIFT PG 2014 Question Paper with solutions