- High myopia is severe nearsightedness, often caused by an elongated eyeball, and carries raised risk of retinal detachment, glaucoma and cataract.
- EVO ICL adds a lens inside the eye rather than removing corneal tissue, so corneal thickness and strength are preserved.
- EVO ICL treats nearsightedness to a far higher level than LASIK, making it the stronger option for severe prescriptions.
- The implanted lens can be removed or exchanged, so the procedure is reversible. LASIK is not.
- LASIK remains the better fit for many low to moderate prescriptions, including farsightedness, which EVO ICL does not treat.
What is high myopia? High myopia is a severe form of nearsightedness in which the eyeball is longer than normal, causing distant objects to appear very blurred. It often runs in families and is associated with a raised risk of retinal detachment, glaucoma, cataracts and retinal damage.
For several reasons, EVO ICL (Implantable Collamer Lens) is often considered a better treatment than LASIK (Laser Assisted In Situ Keratomileusis) for high myopia.
EVO ICL vs LASIK at a Glance
| Factor | EVO ICL | LASIK |
| Technique | Additive: a soft lens is implanted behind the iris | Subtractive: corneal tissue is removed and reshaped |
| Corneal tissue removed | None beyond a micro-incision | Yes, permanently |
| Nearsightedness treated | Up to around -20 diopters | Up to around -10 diopters |
| Astigmatism treated | Up to around 4 diopters with a toric lens | Yes, within its range |
| Farsightedness treated | No | Yes |
| Reversible | Yes, the lens can be removed or exchanged | No |
| Suitability with thin corneas | Generally suitable | Often unsuitable |
| Relative dry eye risk | Lower | Higher |
| Built-in UV filtration | Yes, within the lens material | No |
Corneal Preservation vs Reshaping: Key Differences in Surgical Technique
EVO ICL is an additive procedure. A soft lens is inserted behind the iris and in front of the eye’s existing natural lens. Only a micro-incision is made in the cornea to do this, so the cornea is left largely intact, with little disturbance to corneal nerves and no change to its strength or thickness. The procedure is reversible, because the lens can be removed or exchanged if a prescription changes or vision needs altered.
LASIK is more invasive in structural terms. A flap is created in the surface of the cornea so that tissue underneath can be removed with an excimer laser to reshape it. That is irreversible, because the removed tissue is removed. Healing can take longer since corneal thickness is altered and corneal nerves are disturbed.
You can compare both against the full range of laser vision correction procedures we offer.
High Prescription Limits: Why EVO ICL Outperforms LASIK for Severe Nearsightedness
What is a diopter? A diopter is the unit used to measure the focusing or refractive power of a lens, and therefore the strength of a prescription.
By reshaping the cornea, LASIK can correct low to moderate nearsightedness, generally up to around -10 diopters. By inserting a synthetic lens, EVO ICL can address severe nearsightedness up to around -20 diopters, and astigmatism up to around 4 diopters with a toric lens. Astigmatism is blurred vision caused by an irregularly shaped cornea.
The reason is structural. LASIK works by removing corneal tissue, and it is not practical or safe to remove large volumes of tissue to treat very high prescriptions. EVO ICL can use whatever lens power is required, without that constraint. It also brings other advantages, including a lower risk of dry eye, strong night vision performance and reversibility.
Further technical detail on lens design and approved treatment ranges is published on EyeWiki, maintained by the American Academy of Ophthalmology.
Night Vision Clarity, Dry Eye Reduction and Built-In UV Protection Advantages
Because EVO ICL works by inserting a new lens, the implanted lens can deliver several benefits:
- Night vision clarity: Crisp contrast in low light, with reduced problem glare and halos, because high-definition optics limit light scatter.
- Lower dry eye risk: There is no extensive incision and corneal nerves are largely undisturbed, so natural tear production is less affected. The biocompatible Collamer material works in harmony with the eye rather than drying the surface.
- Built-in UV protection: An ultraviolet filter within the lens material shields the eye from UVA and UVB radiation, which is associated with reduced long-term risk of conditions such as cataracts and macular degeneration.
The Reversibility Factor: Why Having a Removable Implanted Lens Matters Long-Term
LASIK reshapes the eye by permanently removing tissue and therefore cannot be reversed. EVO ICL implants a lens without otherwise altering the eye’s anatomy, so reversal is possible.
During EVO ICL the structure of the eye is preserved and a lens is simply placed in front of the existing natural lens. If your prescription changes or your visual demands shift, the lens can be exchanged for a more suitable one. If a cataract later develops on the natural lens, it can still be treated in the usual way. You are not permanently committed, and you retain the ability to take advantage of future technology or changed preferences.
Candidacy Breakdown: Identifying Who Benefits Most from EVO ICL vs LASIK
Both procedures correct refractive error, but they use fundamentally different techniques, which gives them different strengths.
EVO ICL is generally better for
- Thin or irregular corneas, where insufficient tissue can safely be removed.
- Severe nearsightedness beyond the range LASIK can treat.
- Existing dry eye, since EVO ICL causes minimal disturbance to corneal nerves.
- Patients who value the option of reversal.
LASIK is generally better for
- Low to moderate nearsightedness, farsightedness and astigmatism.
- Patients whose prescription has been stable for at least a year.
- Corneas that are thick and regular enough to allow safe tissue removal.
- Patients without significant pre-existing dry eye.
Before any eye surgery we carry out a full diagnostic assessment to determine which option is genuinely best for you. Book a free consultation to have your corneal thickness, prescription stability and anterior chamber depth measured.
Frequently Asked Questions
Is ICL better than LASIK for high myopia?
For high myopia, EVO ICL is usually the stronger option. It treats nearsightedness up to around -20 diopters compared with roughly -10 diopters for LASIK, it does not require removing large volumes of corneal tissue, and it is reversible. For low to moderate prescriptions, LASIK often remains the simpler and equally effective choice.
Can you have ICL surgery with thin corneas?
Yes. Because EVO ICL adds a lens rather than removing corneal tissue, it is frequently recommended for patients with thin or irregular corneas who are not suitable candidates for LASIK. Corneal thickness is measured at consultation to confirm this.
Does EVO ICL cause dry eye?
EVO ICL carries a lower risk of dry eye than flap-based laser surgery, because the micro-incision disturbs far fewer corneal nerves and natural tear production is less affected. It is often the preferred option for patients who already experience dry eye symptoms.
Can the ICL be removed later?
Yes. The implanted lens can be removed or exchanged by a surgeon if your prescription changes or your visual needs alter. This reversibility is one of the main practical differences between EVO ICL and LASIK.
