You want to stop reaching for glasses, and you've been reading about LASIK. Somewhere in that reading, lens replacement surgery came up, and now you have two procedures, two very different prices, and no clear idea which one is meant for you.
The video below is what I go over with patients who ask me about LASIK. Both operations can get people out of glasses. They work on different parts of the eye, and one part of the eye is on a clock. Give this video 5 minutes and you'll know which of the three procedures, if any, suits you even before you ever book the consult.
What to listen for
- The part of your eye almost nobody knows is there, and what it does for free while you're young.
- Why a 20-year-old, a 40-year-old and a 60-year-old walk in wanting the same thing and leave with three different answers.
- What LASIK trades away if you're over 40 and have been nearsighted all your life.
- A test you can do right now with your own glasses.
- The one question that decides between LASIK and lens replacement after 40. Only you can answer it.
- Why the advice on lens replacement changed, and what changed it.
Four things that didn't fit into five minutes
LASIK after 40 may come with a second appointment in your 50s. The laser's work on the cornea holds: about 95 in 100 eyes are still within half a step of their target six months on, and that part doesn't wander. What keeps changing is the lens inside, so some people who have LASIK in their mid-40s find their vision drifting a decade later and want a small touch-up. It isn't scheduled and it isn't everyone. If it happens, the first job is to check whether the drift is the lens changing or an early cataract, before anyone talks about a second laser.
Monovision is real, and many people don't adapt to it. One eye set for distance and one for near lets some people skip readers after LASIK. In contact lenses, about 6 in 10 people who try it get on with it. After surgery the number runs closer to 8 or 9 in 10, mostly because the people who go ahead have already proven it in contacts. The other side of those figures is the group who never adjust to the two eyes disagreeing, and an operating room is not the place to find out which group you're in. If you already wear monovision contacts and live in them happily, that counts in LASIK's favor. If you've never tried it, ask for a contact lens trial first.
Cataract surgery and lens replacement are the same operation. The natural lens comes out and a clear artificial one goes in. What changes is the reason. When the lens has clouded into a cataract, there's a medical reason and insurance covers the operation. When the lens is still clear and the goal is to get out of glasses, you pay for it yourself. Same surgeon, same lens choices, a different line on the bill.
More people between 40 and 60 are choosing lens replacement than a few years ago. The reason is the implants themselves, and the video says what changed about them. What it doesn't have time for is what that means at a consult: a 50-year-old today hears different advice than their parents heard at 50, and that's a change in the device, not in the surgeon. The newer lenses still trade a little contrast and some halos at night for the range they give, so which implant goes in is its own conversation.
What refractive lens exchange is
Refractive lens exchange, also called lens replacement surgery or clear lens extraction, removes the natural lens inside your eye and replaces it with an artificial lens implant. It corrects nearsightedness, farsightedness and astigmatism, and depending on the implant chosen it can handle near vision too. It's most often done for people over 40, once the natural lens has stopped focusing up close.
What LASIK is
LASIK reshapes the cornea, the clear window on the very front of the eye, with a laser so that light focuses properly. It corrects nearsightedness, farsightedness and astigmatism. It doesn't go inside the eye and it doesn't change the lens, so it can't restore near focus once the lens has stiffened, and it can't prevent a cataract. It's most often the right choice under 40.
Refractive lens exchange and LASIK, side by side
| Refractive lens exchange | LASIK | |
|---|---|---|
| Most often for | Over 40 | Under 40 |
| Corrects | Nearsightedness, farsightedness, astigmatism, and near vision depending on the implant | Nearsightedness, farsightedness, astigmatism |
| Where it works | Inside the eye: the natural lens is replaced | The front of the eye: the cornea is reshaped |
| Recovery | Most people see well within a day or two and are back to normal activities in about a week; usually one eye at a time | Most people see well the next day; the cornea settles over several weeks |
| Not the right fit for | Very mild prescriptions, some eye diseases | Thin corneas, some health conditions, and anyone over 40 who isn't okay wearing readers |
| Cost | $4,500-$5,500 per eye | $2,500 per eye |
| Reading glasses afterward | Often not needed, depending on the lens chosen | Needed after about 40 |
What LASIK is like
The procedure takes less than half an hour for both eyes. Numbing drops go in, a small support holds your eyelids open, and for part of it your vision dims while a suction ring rests on the eye. You'll feel pressure, and some people find that part uncomfortable, but not painful. Afterward you rest with your eyes closed for a few minutes, the flap is checked, and someone drives you home.
The first few days bring some stinging, grittiness and light sensitivity, and glare or halos at night for a few weeks. Most people see clearly right away and are comfortable within a week. The cornea does most of its healing in the first month and finishes over three to six months, with some fluctuation along the way. Dry eye is common for a while and usually settles. One thing LASIK doesn't do is stop the lens inside from aging, which is why a stable prescription for at least a year is part of the screening.
What refractive lens exchange is like
It's done under numbing drops with your pupil dilated, and takes about 15 to 20 minutes per eye. One eye at a time is the usual way; some surgeons do both eyes the same day. You'll see lights and shadows during it and may feel some pressure. Afterward your pupil stays wide for a day or two and vision is blurry while it settles. You'll have anti-inflammatory and antibiotic drops, and the main job is not to rub the eye.
Most people notice sharper vision by the next day and are back to their usual routine within about a week, with swimming and contact sports waiting a little longer. Some dryness and visual variation are normal in the first couple of weeks as your eyes and brain adjust to the new lens. By the one-week visit most people have settled in. Because the implant doesn't age or cloud, the result is meant to last.
Which one is right for you
Your age, your prescription and the health of your eye all matter, and the video sorts them by where you are on the lens clock. A few things worth knowing before that conversation:
- Prescription. Very high prescriptions are often beyond what LASIK can safely correct, and lens replacement covers a wider range.
- Corneas. Thin corneas rule out LASIK, and they don't affect lens replacement.
- A cataract in your future. Lens replacement removes the lens a cataract would form in, so that operation is off the table for good. The trade is that it's surgery inside the eye, with the risks that go with it, including a higher chance of retinal detachment in very nearsighted eyes, so the screening weighs both sides. LASIK leaves the lens where it is.
- Cost. Lens replacement is an operating-room procedure with an anesthesia team and an implant, so it costs more. LASIK in the US ran about $2,600 per eye in 2020; lens replacement runs $4,500 to $5,500 per eye.
The pros and cons of lens replacement on its own are on their own page, and the LASIK questions page covers the rest.
When to see an eye doctor
Both procedures start with an exam and a set of measurements, and the screening is what tells you whether your eyes are healthy enough for either. Not sure which hour of the lens clock you're at? That exam is the answer. Sudden changes in vision, flashes, a curtain across your sight or eye pain are a different matter and are worth being seen for sooner rather than later.
Common questions
What is the difference between refractive lens exchange and LASIK?
They work on different parts of the eye. LASIK reshapes the cornea, the clear front surface, so light focuses correctly. Refractive lens exchange replaces the natural lens inside the eye with an artificial one. It's the same operation as cataract surgery, done before a cataract has formed, to get someone out of glasses.
Can I have LASIK after 40?
Yes. LASIK still corrects distance vision after 40. What changes is the lens inside your eye, which has stiffened and no longer focuses up close, so after LASIK you'll need reading glasses. If you're fine with readers, LASIK is a reasonable choice. If you're not, lens replacement handles distance and near in one operation.
Is refractive lens exchange good?
For the right person, yes. It corrects a wide range of prescriptions, handles near vision depending on the implant, and removes the lens a cataract would later form in. It suits people over 40, people with early cataracts, and people who aren't candidates for laser correction. It's a bigger operation than LASIK and carries the risks of surgery inside the eye, so the screening matters.
Who is not a candidate for RLE?
People with active corneal disease, keratoconus, diabetic retinopathy, macular degeneration or uncontrolled glaucoma are usually steered elsewhere, along with anyone with significant dry eye, anyone pregnant or nursing, and prescriptions outside the range your surgeon sets. Very mild prescriptions are usually better served by a laser procedure.
How long does refractive lens exchange last?
The implant doesn't wear out, cloud or need replacing, so a well-screened patient gets a lasting result from the lens itself. Two things can still change the picture. The thin capsule behind the implant can cloud over months or years, and a quick office laser clears it. And conditions that develop later in the rest of the eye, like macular degeneration or glaucoma, affect vision regardless of which lens is in place.
What to watch next
If you're at the lens replacement or cataract surgery stage, the next decision is which lens goes in, and it's a bigger one than most people expect. That's its own video: 4 Cataract Lens Implant Options: Which One Should You Choose?
Reviewed by Hussain Elhalis, MD · September 16, 2026