Yes. If you had radial keratotomy in the 1980s or 1990s and you are now facing cataract surgery, the Light Adjustable Lens™ (LAL®) may be the single most important lens for you to know about. In the largest published series of post-RK eyes implanted with the second-generation Light Adjustable Lens, 88% finished within 0.50 diopters of their target prescription and 74% saw 20/20 or better without glasses (Webster et al., J Cataract Refract Surg, 2025). In my own practice’s post-RK eyes in 2025, every one finished within 0.50 diopters of target. This post explains why RK eyes are so hard to hit precisely, and why this lens changes the math.
Why RK Eyes Are the Hardest Eyes in Cataract Surgery
If you have been told that your RK eyes make cataract surgery unpredictable, you were not told wrong. You were told the old truth.
Radial keratotomy corrected nearsightedness with a pattern of deep incisions that flattened the cornea. Those incisions worked, but they left behind a cornea that no standard formula reads well. The central flattening changes the relationship between the front and back corneal surfaces that lens-power formulas assume. The incisions create irregular astigmatism. Many RK corneas even fluctuate through the day, so the eye you measure at 8 a.m. is not quite the eye you measure at 4 p.m.
Every conventional intraocular lens, from a basic monofocal to the most advanced trifocal, requires the surgeon to commit to a lens power before surgery based on those measurements. In a virgin eye, modern formulas are excellent. In an RK eye, every input the formula depends on has been altered, and the error compounds. That is why so many post-RK patients have been given grim expectations elsewhere, and why some have simply been turned away.
Why the Light Adjustable Lens After RK Works Differently
The Light Adjustable Lens is the only intraocular lens whose power can be changed after surgery. It is made of a photosensitive material that responds to targeted UV light. I implant it during cataract surgery just like any other lens. Then your eye heals, your cornea settles, and you go live your life for a while, seeing the world through your actual implanted lens.
Only then do we set the final prescription. In a series of brief, painless office light treatments, the lens power is fine-tuned based on your real, measured vision, not a preoperative prediction. When you are happy with the result, two quick lock-in treatments make it permanent.
For an RK eye, this reverses the entire problem. The unpredictability that defeats preoperative formulas stops mattering as much, because the final power is dialed in after the cornea has declared itself. Prediction becomes verification. This is why the Light Adjustable Lens is my lens of choice for patients with prior RK, just as it is for my patients with prior LASIK. You can read the full technology overview on our Light Adjustable Lens page.
A Mature Technology
More than 300,000 Light Adjustable Lens implants have been performed since U.S. launch (RxSight, ASCRS 2026). I have implanted premium intraocular lenses for more than two decades, was the first surgeon in Southern California to implant a premium IOL following FDA approval in 2003, and have served as principal investigator in numerous FDA clinical trials of new ophthalmic devices.
What the Research Shows About the Light Adjustable Lens After RK
The key study is Webster and colleagues, published in the Journal of Cataract and Refractive Surgery in 2025: 94 post-RK eyes from 77 patients, spanning everything from 4-cut to 16-cut RK patterns, all targeted for distance and implanted with the Light Adjustable Lens.
The results would be respectable in eyes that never had surgery. In RK eyes, they are remarkable: 88% finished within 0.50 diopters of target and 98% within 1.00 diopter. 74% of eyes saw 20/20 or better without glasses, 82% saw 20/25 or better, and 94% were correctable to 20/20 or better.
The Post-RK Evidence
In 94 post-RK eyes implanted with the Light Adjustable Lens, 88% finished within 0.50 diopters of target, 98% within 1.00 diopter, and 74% achieved 20/20 or better uncorrected distance vision (Webster et al., J Cataract Refract Surg, 2025). For comparison, in eyes with prior LASIK or PRK, a separate series found 86% within 0.50 diopters of target (Jones et al., J Cataract Refract Surg, 2024).
Timing the Light Adjustable Lens After RK: Why I Delay the First Adjustment
The Webster study carries one caveat I take seriously: in RK eyes, light adjustments should be delayed to allow the refraction to stabilize. RK corneas heal on their own schedule, and adjusting a lens against a cornea that is still shifting wastes the technology’s precision. So in my post-RK patients I wait longer before the first light treatment than I do in other eyes, and I confirm stability across visits before we start tuning. The lens does not rush, and neither do I. You can read what the adjustment visits themselves are like in our guide to the light treatment process.
That patience is shared by other surgeons with deep post-RK experience. In a September 2026 CEDARS/ASPENS debate, a Miami team that has treated about 100 post-RK eyes with this lens described waiting two months or longer before the first light treatment, versus about one month in eyes without RK, and longer still when dry eye or inflammation is present. They also noted that most post-RK eyes need the full schedule of three adjustments and two lock-ins, and that patients have been happy at follow-up visits two, three and four years later (Trattler and Zuniga, Healio Ocular Surgery News, 2026).
What Surgeons Are Debating
Asked which lens performs best in post-RK eyes, experienced surgeons split between two of the options I use: the Light Adjustable Lens, described as the lens that “provides the most reliable outcomes” in post-RK patients, and the small-aperture Apthera™ IOL, favored for corneas with high levels of higher-order aberrations. Neither side called any lens right for every RK eye. Selection, screening, and expectation-setting were the common ground (CEDARS/ASPENS Debates, Healio, September 2026).
The Light Adjustable Lens After RK in My Practice
Published studies are the external check. Here is our own data. My practice tracks every Light Adjustable Lens outcome through the RxSight outcomes analysis program, and we publish the results annually. RK is less common than LASIK in my patient population, so this is a small cohort, and I report it with the sample sizes attached: in 2025, 15 post-RK eyes from 10 patients.
Every one of those 15 eyes, 100%, finished within 0.50 diopters of its target prescription, and 93% finished within 0.50 diopters of the astigmatism target. Of the 10 eyes targeted for distance, 80% saw 20/20 or better without glasses and all 10 reached 20/25 or better. Of the 4 eyes targeted for near in blended-vision plans, all reached J3 or better and 3 of 4 read J2, roughly medicine-bottle print, without glasses. And 67% of eyes needed only a single light treatment to get there.
Our Post-RK Results
In our 2025 post-RK Light Adjustable Lens eyes, 100% (15 of 15) finished within 0.50 diopters of target, and 80% of distance-targeted eyes saw 20/20 or better without glasses. Small cohort, stated plainly, with every denominator shown. See our complete outcomes, including all 137 eyes from 2025, on our results page.
Ten patients is not a clinical trial, and I would never present it as one. But it is every RK patient we treated with this lens in 2025, not a highlight reel, and it tracks with what the published multicenter data shows: RK eyes, handled patiently with an adjustable lens, can finish where modern cataract surgery is supposed to finish. Individual results vary.
Who Is Not a Candidate, and What the LAL Asks of You
Honesty first: the Light Adjustable Lens corrects your prescription. It does not erase the RK incisions themselves, so some optical effects of an irregular cornea, such as glare or starbursts in dim light, may persist even with a perfect refractive result. Patients with very large pupils, certain retinal conditions, or medications that increase light sensitivity need careful evaluation, and some are better served by a different lens.
The lens also asks something of you. You wear UV-protective glasses from surgery until lock-in so sunlight cannot adjust the lens prematurely. You attend the adjustment visits, typically one to three treatments plus two lock-ins, and in RK eyes I add waiting time up front for stabilization. Published comparisons are candid that Light Adjustable Lens patients make more office visits than monofocal patients (Merikansky et al., J Refract Surg, 2026). For a patient who wants the fewest possible appointments, a conventional lens may be the better fit. For an RK patient who has waited decades for sharp, stable vision, the extra visits are usually the easiest part of the decision. If you are weighing that tradeoff, start with fixed versus adjustable cataract surgery.
One more honest note on lens choice: the Light Adjustable Lens is not the only option I consider for post-RK eyes. For corneas left significantly irregular by RK, the small-aperture Apthera™ IOL is often the better fit, because its pinhole optics filter out the scattered light an irregular cornea creates and can mask a meaningful amount of irregular astigmatism. Surgeons who favor it screen carefully: they measure corneal higher-order aberrations first, and some have patients try pinhole glasses to preview that type of vision. It is not a lens for everyone; it can dim vision in low light, so I reserve it for the eyes it truly suits. The extended-depth-of-focus version of the Light Adjustable Lens is generally not recommended in post-RK eyes for the same reason: an irregular, biomechanically unstable cornea does not support that optic well. Which lens serves your eye better is exactly what the diagnostic workup at your consultation is designed to answer.
What I Tell My RK Patients
You have probably done more research than any patient in my waiting room, because you have had to. Many of you were early adopters once, and some of you feel burned by it. So here is what I say in the exam chair.
Your eye is not a lost cause. It is a harder eye, and harder eyes deserve a plan built around their unpredictability instead of a formula that pretends it away. When I examine you, we map your cornea with the iTrace, Pentacam, IOL Master, and OCT, and we talk about what your day actually looks like: driving, golf, reading, screens. If cataract surgery is not yet on your horizon but your lens is aging, the same adjustable-lens thinking applies to refractive lens exchange. No single lens is right for everyone, and I will tell you plainly if you are the patient for whom a different lens, or waiting, is the wiser call.
I perform every consultation and every surgery myself. I call you the evening of your surgery, I see you myself the next day, and I ask you to save my cell phone number so you can reach me directly with any question. RK eyes need that kind of attention. It is the way this practice has worked since 2001.
FAQs About the Light Adjustable Lens After RK
Will my vision still fluctuate after surgery?
Cataract surgery and the Light Adjustable Lens address the lens inside your eye, not the RK incisions in your cornea. Eyes with significant diurnal fluctuation before surgery may retain some of it afterward. The adjustment process is timed around your cornea’s stable state, and most patients find their overall vision far more consistent than before.
How long after surgery until the first light treatment?
Longer than for most patients. In RK eyes I wait until your refraction is stable across visits, which can take several extra weeks, before beginning adjustments. Published guidance on post-RK eyes supports delaying adjustments for stabilization.
Can I get a trifocal lens instead of the LAL after RK?
Usually not. An irregular post-RK cornea tends to degrade the optics of diffractive multifocal lenses, so most RK patients are typically limited to a monofocal or the Light Adjustable Lens. Your evaluation determines what your cornea can support.
Does the number of RK cuts change my odds?
The published series included 4-cut through 16-cut eyes and reported favorable outcomes across the group. More cuts generally mean a more irregular cornea, which is exactly the situation where adjusting after healing helps most. Your imaging tells us what to expect.
Is the Light Adjustable Lens covered by insurance after RK?
Cataract surgery itself is generally covered by insurance or Medicare with a standard monofocal lens. The Light Adjustable Lens is a premium lens upgrade paid out of pocket, and exact costs depend on your surgical plan. We review everything at your consultation.
If you had RK and have been told your cataract surgery will be a gamble, come let us look at your eyes before you accept that answer. Schedule your consultation with Dr. Feinerman at (949) 631-4780 or through FeinermanVision.com.
Gregg Feinerman, MD, FACS, is the founder and sole surgeon of Feinerman Vision in Newport Beach, California. This article is educational and does not diagnose any condition or guarantee candidacy for any procedure. Candidacy is determined only by a comprehensive evaluation.
Related Reading
- Light Adjustable Lens (Pillar)
- Can You Get the Light Adjustable Lens After LASIK?
- Our Light Adjustable Lens Results
- The Light Adjustable Lens Treatment Process
- Cataract Surgery After LASIK
- Fixed vs. Adjustable Cataract Surgery
References
- Webster M, Baartman B, Jones M, et al. Light-adjustable lens in eyes with a history of radial keratotomy. J Cataract Refract Surg. 2025;51(3):243-248. doi: 10.1097/j.jcrs.0000000000001596.
- Jones M, Terveen DC, Berdahl JP, et al. J Cataract Refract Surg. 2024. doi: 10.1097/j.jcrs.0000000000001481.
- Merikansky S, et al. J Refract Surg. 2026. doi: 10.3928/1081597X-20260408-02.
- Beckman KA, Stonecipher KG, Zuniga M, Trattler WB. Which IOL performs best in post-RK eyes? CEDARS/ASPENS Debates. Healio Ocular Surgery News. September 3, 2026.
Practice figures compiled from the Feinerman Vision 2025 RxSight Outcomes Analysis (post-RK cohort, reported August 2026).