The short answer: No. Photochromic lenses, often called Transitions after the best-known brand, have the light-reactive treatment built into the lens itself, so it cannot be added to lenses you already own. To get the effect you need new lenses, which can usually go into your current frame if it is in good shape. A cheaper route to the same convenience is clip-on sunglasses or a second pair of prescription sunglasses.

Why it cannot be added

Photochromic performance comes from light-sensitive molecules dispersed through the lens material or bonded into its surface during manufacture. It is not a coating an optician can brush on afterward. So an existing clear lens cannot be converted; the reactive layer has to be part of a lens made that way from the start.

Getting new photochromic lenses

The way to get the effect is to order new photochromic lenses in your current prescription. They are made to react to UV, darkening outdoors and clearing indoors. Ask your optician for photochromic (Transitions or an equivalent) when ordering the lenses.

Keep your frame, change the lens

You usually do not need a new frame. If your current frame is sound and suits the lens type, an optician can fit fresh photochromic lenses into it. That saves the frame cost and keeps a frame you already like. A frame that is stretched or cracked is worth replacing at the same time.

Cheaper alternatives

• Clip-on sunglasses: a tinted clip over your clear glasses gives sun protection on demand for far less; see clip-on sunglasses.
• A second pair of prescription sunglasses: dedicated sun lenses that are darker and more consistent than photochromic; see the prescription sunglasses guide.

The car caveat

One thing to know before you invest: most photochromic lenses barely darken behind a car windshield, because the glass blocks the UV that triggers them. If your main need is driving sun, prescription sunglasses or a clip-on serve you better. See photochromic lenses in cars and the full photochromic explainer.

From our test bench. When people ask to "add Transitions," what they usually want is one pair that handles indoors and sun. We walk through the trade-off: photochromic lenses are convenient but slow to clear and weak in cars, while a clip-on or second sun pair is cheaper and darker on demand. The right answer depends on whether driving sun is the main need.

FAQ

Can Transitions be added to my current lenses?

No. The photochromic treatment is built into the lens during manufacture, so it cannot be applied to lenses you already own. You need new photochromic lenses, which can go into your existing frame.

Do I need a new frame for photochromic lenses?

Usually not. If your current frame is in good shape and suits the lens, an optician can fit new photochromic lenses into it, saving the frame cost.

What is a cheaper alternative to Transitions?

Clip-on sunglasses over your clear glasses, or a second pair of prescription sunglasses. Both cost less and, unlike photochromic, work fully while driving.

Part of The Complete Guide to Prescription Lenses · Related: photochromic lenses explained · Browse eyeglasses · Last updated: August 5, 2026