Skip to content
Welcome offer: 15% off your first order with code WELCOME15 30-day returns on frames and lenses Free standard shipping on US orders over $49
LUMORA Lumora Eyewear home
Sign in Create account Track an order

Eye care

Eyeglasses That Darken in Sunlight

An introduction to photochromic lenses: how they work, who likes them and their trade-offs.

Last updated November 3, 2026 · General information only, not medical advice. Please see a licensed eye-care professional for your prescription and eye health.

Tortoise sunglasses resting on a ledge under a bright blue sky

Glasses that darken in sunlight use photochromic molecules that change structure under UV light, absorbing more visible light. Indoors, without UV, they gradually return to clear.

Who tends to like them

  • People who move between indoors and outdoors often.
  • Anyone who would rather not carry a separate pair of sunglasses.
  • Wearers who want UV protection built in.

Trade-offs

  • They take time to fade when you come indoors.
  • They often darken less behind a car windscreen.
  • They are not polarized unless specified.

Add photochromic lenses in the lens builder.

Explore lens options

Best Frames for High Prescriptions

Frame shapes, sizes and lens materials that keep strong prescriptions looking slimmer.

Blurry Vision at Night

Common, general reasons why vision can feel less sharp in low light, and when to see a professional.

Using FSA & HSA Funds for Glasses

How flexible spending and health savings accounts generally apply to prescription eyewear.

Do Photochromic Lenses Protect Against UV?

How light-adaptive lenses react to UV light and what to check on the label.