Several types of eye surgery can improve vision, and the right one depends on what’s causing the problem. Nearsightedness, farsightedness, and astigmatism can often be corrected with laser procedures. Clouded lenses from cataracts are treated by swapping in an artificial lens. Conditions like glaucoma and retinal detachment require surgeries that protect or restore vision by addressing the underlying damage. Here’s a breakdown of the major options and who they’re best suited for.
Laser Refractive Surgery for Glasses-Free Vision
If you wear glasses or contacts for nearsightedness, farsightedness, or astigmatism, laser refractive surgery reshapes the cornea so light focuses correctly on the retina. The three most common procedures are LASIK, PRK, and SMILE, and each works a little differently.
LASIK is the most widely known. A surgeon creates a thin flap in the cornea, reshapes the tissue underneath with a laser, then replaces the flap. It’s FDA-approved for nearsightedness up to about -8.0 diopters, farsightedness up to +6.0, and astigmatism up to 3.0 diopters. Recovery is fast: most people notice sharper vision within a day, and the latest generation of LASIK technology has produced results where 98% of patients achieved 20/12.5 vision or better in a recent study from the American Academy of Ophthalmology. You’ll need to avoid swimming for at least two weeks and contact sports for up to a month afterward.
PRK removes the outer layer of the cornea entirely instead of creating a flap, then reshapes the tissue beneath. Because no flap is involved, PRK is the go-to option for people whose corneas are too thin for LASIK, or those with certain corneal irregularities or a high risk of eye trauma (think military personnel or contact-sport athletes). It can correct a slightly wider range of nearsightedness, up to about -9.75 diopters. The trade-off is a longer, more uncomfortable recovery since the outer corneal layer needs to regenerate.
SMILE uses a laser to create a small disc of tissue inside the cornea, which the surgeon removes through a tiny incision. There’s no flap at all, making it appealing for corneal stability. It’s approved for nearsightedness from -1.0 to -10.0 diopters with astigmatism up to 3.0 diopters, but it doesn’t currently treat farsightedness.
Implantable Lenses for High Prescriptions
When your prescription is too strong for laser correction, or your corneas are too thin, an implantable collamer lens (ICL) is an alternative. Rather than reshaping the cornea, a surgeon places a small lens behind the iris and in front of your natural lens. It works like a permanent contact lens inside the eye.
ICL is particularly well suited for high myopia (prescriptions stronger than -6.0 diopters). Research comparing ICL to LASIK for high myopia found that ICL produced fewer higher-order visual distortions and better refractive stability over time. Patients with large pupils also tend to get better visual quality with ICL, since laser procedures on the cornea can introduce more glare and halos in those cases. Your prescription needs to have been stable for at least two years before you’re a candidate, and unlike laser surgery, ICL is reversible since the lens can be removed.
Cataract Surgery and Lens Replacement
Cataracts develop when the eye’s natural lens becomes cloudy, usually with age. Surgery is the only treatment, and it’s one of the most commonly performed procedures in the world. The surgeon removes the clouded lens through a small incision and replaces it with a clear artificial intraocular lens (IOL).
The type of IOL you choose shapes what your vision will be like afterward. There are three main categories:
- Monofocal IOLs correct vision at one distance, typically far away. They’re the standard option, but most people still need reading glasses afterward.
- Multifocal IOLs are designed to reduce dependence on glasses at multiple distances, including reading, computer work, and driving. They work well for many people but can sometimes introduce halos around lights at night.
- Toric IOLs correct pre-existing astigmatism, reducing or eliminating the need for astigmatism-correcting glasses after surgery.
Multifocal and toric lenses are considered premium options and often aren’t fully covered by insurance, with patients paying the difference out of pocket. The choice depends on how much astigmatism you have, how important glasses-free living is to you, and your budget. Recovery from cataract surgery involves avoiding swimming for up to four weeks, skipping heavy lifting, and keeping your head above your waist (no downward-facing yoga poses). Light walking is usually fine within days.
Refractive Lens Exchange for Age-Related Vision Loss
Presbyopia, the gradual loss of near vision that typically starts in your early to mid-40s, happens because the natural lens stiffens and can no longer change shape to focus up close. Two surgical approaches can address it.
Refractive lens exchange (RLE) is essentially the same procedure as cataract surgery, but performed before a cataract develops. The surgeon removes the natural lens and replaces it with a multifocal IOL that provides clear vision at multiple distances. Because the artificial lens doesn’t age, the correction is permanent, and you’ll never develop cataracts in that eye. RLE is often recommended for people over 40 whose prescriptions are outside the range laser surgery can correct, or who want to address presbyopia and distance vision at the same time.
Monovision LASIK is a different approach. One eye is corrected for distance and the other for near vision, and the brain learns to rely on each eye for different tasks. It works well for some people but can reduce depth perception, so a trial with contact lenses is usually recommended before committing to surgery.
Corneal Transplant Surgery
When the cornea is damaged by disease, injury, or genetic conditions, a corneal transplant replaces the affected tissue with donor tissue. The specific technique depends on which layer of the cornea is involved.
Penetrating keratoplasty (PK) is the traditional full-thickness transplant, replacing the entire cornea. It has excellent long-term graft survival: 98% at five years and 92% at ten years in a large study. However, recovery is slow and the cornea takes many months to stabilize.
Newer partial-thickness techniques have become preferred when only the inner layer of the cornea is diseased, which is the case in Fuchs’ dystrophy, the most common reason for corneal transplantation. DMEK and DSAEK selectively replace just the thin inner layer, leaving most of the patient’s own cornea intact. This means faster visual recovery and a more stable eye structure. Five-year graft survival is 92% for DMEK and 86% for DSAEK, with ten-year rates of 75% and 73% respectively. While those numbers are lower than full-thickness transplants, the quicker recovery and reduced risk of astigmatism make these techniques the first choice for many patients.
Surgery for Glaucoma
Glaucoma damages the optic nerve, usually because pressure inside the eye is too high. Surgery for glaucoma doesn’t restore vision that’s already been lost, but it can lower eye pressure to prevent further damage.
Minimally invasive glaucoma surgery (MIGS) has become increasingly popular, especially for people with mild to moderate glaucoma who are also having cataract surgery. These procedures use tiny implants or instruments to improve the eye’s natural drainage. Common devices include the iStent, Hydrus Micro-Stent, and the Kahook Dual Blade technique. When combined with cataract surgery, MIGS produces a meaningful additional drop in eye pressure compared to cataract surgery alone. Recovery is generally quicker and carries fewer risks than traditional glaucoma surgeries, which involve creating new drainage pathways and tend to be reserved for more advanced disease.
Retinal Surgery
A retinal detachment occurs when the light-sensitive tissue at the back of the eye pulls away from its supporting layer. Without surgery, it leads to permanent vision loss. Vitrectomy is the most common repair method: the surgeon removes the gel filling the eye, reattaches the retina, and fills the eye with a gas bubble or silicone oil to hold the retina in place while it heals.
Anatomical success, meaning the retina stays reattached, ranges from about 55% to 76% depending on the severity and cause of the detachment. In terms of visual outcomes, roughly 54% of patients see improvement after surgery, while 36% experience worsened vision and 10% remain stable. Up to 13% of patients ultimately achieve 20/20 vision, but up to 32% end up with no usable vision in that eye. These wide ranges reflect the fact that outcomes depend heavily on how much of the retina was detached, whether the central vision area (the macula) was involved, and what caused the detachment in the first place.
What Insurance Typically Covers
Surgeries that treat a medical condition, like cataracts, glaucoma, retinal detachment, and corneal disease, are generally covered by health insurance. Refractive surgeries like LASIK, PRK, SMILE, and ICL are almost always considered elective and cosmetic, so insurance won’t pay for them. Some vision plans offer discounts on laser eye surgery, but full coverage is rare.
There are exceptions. Insurance may cover refractive surgery if your vision problems resulted from an injury or a previous surgery, if your refractive error is severe, or if you have a documented physical inability to wear both glasses and contact lenses. There’s no universal threshold for what qualifies as “severe enough,” so coverage decisions vary between insurers.