Risk one: cataract
The ICL sits just in front of the natural crystalline lens. If it sits too close, or if the surgeon's instruments contact the lens during implantation, the front of the natural lens can develop an opacity called an anterior subcapsular cataract. This was a real problem with early lens generations and low vaults. With the current EVO design and modern sizing, published ten-year data put the rate of visually significant cataract in the range of roughly 1 to 3 percent, with most cases in older patients and higher prescriptions.
The important nuance: every patient will eventually develop an ordinary age-related cataract. The ICL is simply removed at that time and a standard lens implant is used. So the question is not whether you will ever have cataract surgery, but whether the ICL brings it forward. For most patients under 40 with correct vault, it does not appreciably.
Risk two: intraocular pressure
Pressure rises after ICL come in two forms. The first is a short spike in the first 24 hours from retained viscoelastic, which is why day-one checks are non-negotiable. The second is chronic: a lens that vaults too high narrows the angle and can push pressure up over months. The EVO's central port was designed to let fluid circulate and essentially eliminated pupillary block, but angle narrowing from an oversized lens still happens and is corrected by exchanging the lens.
Steroid drops after surgery can also raise pressure in susceptible patients. A surgeon should schedule a pressure check at week one and month one, and you should keep annual pressure checks for life.
Risk three: endothelial cell loss
The corneal endothelium is a single layer of cells that keeps the cornea clear and does not regenerate. Everyone loses cells slowly with age. Intraocular surgery of any kind causes a small one-time loss, and a lens that sits too close to the cornea can cause ongoing loss. Long-term ICL studies report annual losses close to natural aging when vault is appropriate, and faster losses when the anterior chamber is shallow. This is exactly why chamber depth and a baseline cell count are candidacy requirements, and why annual specular microscopy is recommended.
What good long-term follow-up looks like
- Baseline endothelial cell count before surgery, written in your file
- Vault measured by OCT at week one, month one, and yearly
- Pressure at every visit
- Dilated lens exam yearly to catch early opacity
Who carries higher risk
- Patients over 45 (higher baseline cataract risk; often steered toward lens replacement instead)
- Prescriptions above -15 D
- Shallow anterior chambers near the 2.8 mm floor
- Low baseline endothelial counts
How this compares with LASIK and PRK
LASIK and PRK carry no intraocular risk at all; their risks live in the cornea (dry eye, ectasia, flap issues). The ICL trades corneal risk for intraocular risk. For a high myope with a thin cornea, that trade is usually worth it. For a -4 D patient with a thick cornea, it usually is not. See our three-way comparison.
Follow-up when you had surgery abroad
If you have your ICL in Colombia, arrange a US or Canadian ophthalmologist before you leave home who is willing to do annual vault and endothelial checks. Bring the operative report with lens size and serial number. Most comprehensive ophthalmologists can manage ICL follow-up once they have that information.
Frequently asked questions
Does the ICL cause cataracts?
It can bring one forward in a small minority, mostly with low vault or in older patients. Current data put clinically significant cataract at roughly 1 to 3 percent over a decade.
Can the ICL cause glaucoma?
An oversized lens can narrow the drainage angle and raise pressure. This is caught on follow-up and fixed by lens exchange.
How often should I be checked after ICL?
Day one, week one, month one, then yearly for life, with vault, pressure and endothelial cell count.
Want a surgeon who documents vault and cell counts?
We only refer to Colombian surgeons who give you a full operative report and a follow-up plan you can hand to your doctor at home.
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