Light Adjustable Lens Lock-In: What It Is and When It Happens
Medically reviewed by Todd Driver, MD · August 2026
Quick answer: Lock-in is the final step of the Light Adjustable Lens process. Once your prescription is where you want it, two lock-in light treatments, spaced one week apart, make the lens permanent so it can never change shape again. After the second lock-in, the UV glasses come off for good.
Why lock-in exists
The LAL is adjustable because its material responds to a specific wavelength of UV light. That's a great property while we're fine-tuning your vision, and a bad one to leave open-ended for the rest of your life. Lock-in uses up the remaining light-sensitive material in the lens so no further change is possible, intended or otherwise.
What the appointments are like
In my practice, lock-in happens after your adjustments are done, which is typically four to six weeks after your second eye's surgery, sometimes a bit longer. There are two lock-in treatments, one week apart, each its own appointment. The treatment itself feels like an adjustment: dilating drops, a few minutes at the light delivery device, and you're done. Nothing is implanted or removed.
The question I get most: "Can I change my mind later?"
No, and that's the point. Lock-in is the trade where you give up adjustability in exchange for permanence. This is why we don't rush it. If you're still on the fence about your near vision target, we talk about it before lock-in, not after. In the published registry, more than half of patients changed their target prescription during the adjustment period after living with their vision for a while. That's exactly what the window before lock-in is for.
After lock-in
The glasses come off, the lens is permanent, and from that point the LAL behaves like any other implanted lens. The lens itself has nothing to maintain and nothing that wears out.
Sources: FDA premarket approval P160055, summary of safety and effectiveness · Doane et al., clinical data registry of two light adjustable lenses (J Cataract Refract Surg 2025)
Related reading: The Light Adjustable Lens, explained · How many adjustments you get · The UV glasses, explained · or book a cataract consultation in Irvine.
Curious whether you're an LAL candidate?
It takes one consultation to find out. OC Eye Associates, Irvine.
Call (949) 653-9500This article is for educational purposes and is not a substitute for a medical examination or personalized medical advice. Timelines describe my own practice and can differ between surgeons.