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What Is an Implantable Collamer Lens (ICL)

An implantable collamer lens is a thin, flexible lens placed inside the eye to correct refractive errors such as myopia or astigmatism. The lens sits behind the iris and in front of the natural crystalline lens. It works by bending incoming light so it focuses properly on the retina. Because the natural lens stays in place, this procedure is considered additive rather than removing tissue. Many patients choose ICLs when they are not good candidates for laser vision correction.

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What Is an Implantable Collamer Lens (ICL)

An implantable collamer lens is a thin, flexible lens placed inside the eye to correct refractive errors such as myopia or astigmatism. The lens sits behind the iris and in front of the natural crystalline lens. It works by bending incoming light so it focuses properly on the retina. Because the natural lens stays in place, this procedure is considered additive rather than removing tissue. Many patients choose ICLs when they are not good candidates for laser vision correction.

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How Is an Implantable Collamer Lens Placed?

The surgeon makes a small incision at the edge of the cornea and inserts the folded ICL into the anterior chamber. The lens unfolds gently and slides behind the iris. Fine positioning ensures that the lens sits securely without touching the natural crystalline lens. The procedure usually takes less than thirty minutes and uses numbing drops.

What Are the Benefits of an ICL?

ICLs deliver sharp optical quality because the lens sits close to the eye's natural focusing system. People with higher prescriptions often appreciate the wider correction range. The eye tissue remains mostly unchanged since the cornea is not reshaped. The lens is removable if needed, giving flexibility in long term care.

Who Is a Good Candidate for an ICL?

ICLs are suitable for people with moderate to high myopia, thin corneas, or prescriptions outside the range of laser procedures. Patients must have a healthy anterior chamber and sufficient space for safe placement. An eye care professional uses imaging to confirm measurements before recommending the lens. People seeking a reversible refractive option also consider this approach.

What to Know Moving Forward

Implantable collamer lens (ICL) is a vision correction lens placed inside the eye, usually in front of the natural lens. If you are thinking about ICL, the next step is a full eye exam to confirm candidacy and take detailed measurements. After the procedure, follow-up visits matter because eye pressure and healing need to be tracked. If you notice worsening pain, sudden blurry vision, strong halos that do not settle, or increasing redness, contact your eye surgeon right away.

Frequently Asked Questions About an Implantable Collamer Lens (ICL)

Are ICLs permanent?

ICLs are long lasting but can be removed or exchanged if needed. Surgeons consider them stable for many years of wear.

Do ICLs treat presbyopia?

Standard ICLs correct distance vision but do not correct near vision loss from presbyopia. Additional procedures or reading glasses may still be needed.

Can I feel the ICL inside my eye?

No, the lens sits inside the eye without touching pain sensitive tissue. Most patients do not feel anything after healing.

Do ICLs increase eye pressure?

Older ICL designs sometimes affected fluid flow, but modern versions include a central port to support normal pressure. Regular checkups monitor eye health.

References

Implantable Collamer Lens. EyeWiki. https://eyewiki.org/Implantable_Collamer_Lens. Published on August 25, 2025

EVO/EVO+ VISIAN Implantable Collamer Lens (ICL) ? P030016/S035. U.S. Food and Drug Administration (FDA). https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpma/pma.cfm?id=P030016S035. Approved on April 18, 2022

Phakic IOLs for Myopia and Myopic Astigmatism. American Academy of Ophthalmology EyeNet. https://www.aao.org/eyenet/article/phakic-iols-for-myopia-and-myopic-astigmatism. Published on October 1, 2019

The Implantable Collamer Lens With a Central Port: Review of the Literature. Mark Packer. Clinical Ophthalmology. https://s24.q4cdn.com/405935222/files/doc_downloads/clinical_papers/Brian-Moore-1_Packer_opth-188785-the-implantable-collamer-lens-with-a-central-port-review-of-112618.pdf. Published in 2018