Surgical Vision Correction Beyond LASIK: SMILE, ICL, and Refractive Lens Exchange

Why Look Beyond LASIK?

LASIK remains one of the most commonly performed elective surgical procedures in the United States, but it is not the right fit for every patient. People with thin corneas, high prescriptions, significant dry eye, or certain corneal irregularities may not meet standard LASIK candidacy criteria. Fortunately, the field of refractive surgery has evolved considerably, offering several well-established alternatives that address a broader range of visual needs.

Understanding what distinguishes these procedures — and who they are designed for — is an important first step toward an informed conversation with an eye care professional. See our overview of laser surgery candidacy factors for a deeper look at how eligibility is evaluated. It is also worth reviewing common vision correction myths before drawing conclusions about any procedure.

SMILE: A Flapless Laser Approach

SMILE — Small Incision Lenticule Extraction — is an FDA-approved laser refractive procedure that corrects myopia (nearsightedness) and, in some formulations, astigmatism. Unlike LASIK and PRK, SMILE does not create a corneal flap. Instead, a femtosecond laser carves a small disc of corneal tissue — called a lenticule — which is then extracted through a tiny arc-shaped incision.

Because no flap is created, some surgeons consider SMILE potentially advantageous for patients with concerns about flap-related complications or those engaged in high-contact activities. Research suggests SMILE produces comparable visual outcomes to LASIK for appropriate candidates, though long-term data continues to accumulate. Recovery is generally described as gradual over several days to weeks, with some patients noticing initial blurriness before vision stabilizes.

ICL: An Additive Lens Inside the Eye

The Implantable Collamer Lens (ICL) takes a fundamentally different approach: rather than altering corneal tissue, a surgeon implants a soft, biocompatible lens behind the iris and in front of the eye's natural lens. The procedure is FDA-approved for the correction of myopia and myopia with astigmatism, and is particularly relevant for patients who are poor candidates for corneal laser surgery.

ICL is considered an additive procedure — the natural lens remains intact — and it is reversible, meaning the implant can be removed if necessary. Candidates typically have higher degrees of myopia and adequate space within the anterior chamber of the eye. Because no corneal tissue is removed, ICL preserves corneal thickness, which may be clinically meaningful for certain patients.

Refractive Lens Exchange: Replacing the Eye's Natural Lens

Refractive lens exchange (RLE), also called clear lens extraction, involves removing the eye's natural crystalline lens and replacing it with an artificial intraocular lens (IOL) calculated to correct the patient's refractive error. The surgical technique is essentially the same as cataract surgery, but the target lens is still optically clear rather than clouded.

RLE is generally considered for older adults — particularly those experiencing presbyopia (age-related loss of near focus) — or for patients with very high prescriptions outside the range suitable for laser correction. Because the natural lens is removed, patients who undergo RLE will not develop a cataract in that eye in the future. However, younger patients who still have strong accommodative capacity (the ability to shift focus between distances) are typically not candidates, as removing the natural lens eliminates that function unless a premium IOL design partially compensates for it.

For those interested in understanding how these surgical options compare to non-surgical approaches, orthokeratology represents a non-surgical, temporary alternative worth exploring.

Choosing the Right Procedure: A Decision Made With Your Specialist

No single refractive procedure is right for everyone. The appropriate choice depends on a detailed pre-operative assessment that typically includes corneal mapping, measurement of corneal thickness, evaluation of anterior chamber depth, prescription stability history, age, and overall eye health. Clinicians also weigh patient lifestyle factors and expectations.

Patients should approach the consultation prepared to ask specific questions: What are the realistic visual outcomes for my prescription? What are the most common risks and how are they managed? What does the recovery period look like, and what limitations should I expect? Consulting guidance on eye exams and preventive eye care can also help patients understand the baseline assessments involved.

“The goal of refractive surgery has always been to match the right procedure to the right patient — not to apply a single solution universally. Advances like SMILE and ICL have meaningfully expanded the options available to people who were previously considered poor surgical candidates.”

— David R. Hardten, MD, Refractive and cataract surgeon; past president, American Society of Cataract and Refractive Surgery

This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified ophthalmologist or eye care professional regarding any surgical procedures or vision concerns.