Can I get LASIK in Portland if I have thin or irregular corneas?
Some patients with thin corneas can still have LASIK, as long as enough corneal tissue will remain after treatment to keep the cornea strong. Irregular corneas are sorted by cause. An irregular cornea caused by keratoconus or a similar weakening condition rules LASIK out. Patients outside LASIK limits are usually evaluated for PRK, SMILE, the EVO ICL implantable lens or refractive lens exchange (RLE), which keep more of the cornea’s strength.
Steven Tersigni, MD, MPH, the only WCRS board-certified LASIK surgeon in Portland, performs every procedure at Tersigni Vision himself. Tersigni Vision offers PRK, SMILE, EVO ICL and Refractive Lens Exchange (RLE) alongside LASIK, so a patient whose corneas rule out LASIK can be evaluated for each alternative at the same practice.

How thin is too thin for LASIK in Portland?
Many surgeons treat a starting corneal thickness of about 500 microns as the screening line for LASIK, but the deciding number is the tissue left after treatment. The American Academy of Ophthalmology cites 250 microns of untouched tissue beneath the flap as a suggested minimum, and as of 2026 many surgeons hold to 300 microns. The Academy also links altering 40 percent or more of the cornea’s starting thickness to higher risk of corneal weakening.
Tersigni Vision notes that the average cornea measures about 540 to 550 microns, and that current laser technology has extended LASIK candidacy to some patients within that range and slightly below. Dr. Tersigni takes a conservative approach to candidacy. Measurements close to a limit lead to a PRK, SMILE or EVO ICL evaluation.
Does an irregular cornea or keratoconus rule out LASIK in Portland?
Keratoconus and other conditions that weaken and bulge the cornea rule out LASIK, because removing corneal tissue can speed up the weakening. Irregularity from other causes is different. A scar or uneven astigmatism on an otherwise stable cornea is evaluated case by case. The American Academy of Ophthalmology advises surgeons to confirm that irregular astigmatism is not a sign of keratoconus before any laser vision correction.
At Tersigni Vision, keratoconus is one of the eye conditions that rule out LASIK, and every patient’s corneal results are discussed directly with Dr. Tersigni. Just because someone has an irregular cornea or keratoconus, that doesn’t mean that there aren’t other options that could be available to correct the vision. Tersigni Vision has no high-pressure sales tactics, so a patient who isn’t a LASIK candidate hears why and what comes next.
How do Portland LASIK surgeons measure corneal thickness and shape?
Surgeons measure corneal thickness with pachymetry and corneal shape with topography or tomography, which map the cornea’s surfaces to screen for early keratoconus. Pachymetry reads thickness at the center and the thinnest point. Tomography maps both front and back surfaces. Surgeons read the results together with the prescription to calculate how much tissue a treatment would remove and how much would remain.
Every Tersigni Vision patient completes the 90-minute Tersigni Vision Advanced Ocular Analysis before any procedure is recommended. The exam includes detailed corneal mapping, pachymetry and wavefront analysis, and Dr. Tersigni goes through the results with each patient in person.
Is SMILE an option in Portland if my corneas are borderline thin?
SMILE, or small incision lenticule extraction, can be an option for nearsighted patients whose corneas are borderline thin but normally shaped. SMILE corrects vision through a small incision without cutting a flap, which leaves more of the cornea’s strong front layers intact. SMILE still removes tissue. The same limits on remaining thickness apply, and SMILE is not used on corneas with keratoconus.
Tersigni Vision performs SMILE on the ZEISS VisuMax, the same femtosecond laser used to create LASIK flaps at the practice. Dr. Tersigni chooses between SMILE, PRK and LASIK for a borderline-thin cornea using the measurements from the Tersigni Vision Advanced Ocular Analysis.
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Can topography-guided laser treatment in Portland correct an irregular cornea?
Topography-guided laser treatment can correct minor irregularity on a structurally healthy cornea, because it shapes the treatment to the cornea’s measured surface. Its U.S. FDA approval covers normal corneas. Treating scars or other significant irregularity this way is an off-label decision made case by case. Topography-guided treatment is not FDA-approved for keratoconus.
Dr. Tersigni completed fellowship training under Y. Ralph Chu, MD at Chu Vision Institute and has been involved in 10 U.S. FDA trials. At Tersigni Vision, irregular corneas, including scars from a past corneal injury, are evaluated one patient at a time using the corneal maps from the Tersigni Vision Advanced Ocular Analysis.
Can refractive lens exchange help Portland patients in their mid-40s who have thin corneas?
Refractive lens exchange (RLE) can correct vision for patients in their mid-40s and older whose corneas are too thin for laser treatment. RLE replaces the eye’s natural lens and does not reshape the cornea. The replacement intraocular lens is chosen to correct nearsightedness, farsightedness, astigmatism or age-related loss of near vision, called presbyopia. Corneal shape still matters. The cornea’s measurements guide the choice of lens power.
At Tersigni Vision, the lens used in Refractive Lens Exchange (RLE) is chosen around each patient’s daily vision needs, including multifocal designs for patients who want both near and distance vision. That choice is made with Dr. Tersigni as part of the concierge-level care Tersigni Vision provides.
Why is PRK often recommended for thin corneas in Portland?
PRK, or photorefractive keratectomy, is recommended for thin corneas because it reshapes the cornea without cutting a flap, which preserves more of the cornea’s thickness and strength than LASIK. The laser works on the surface after the thin outer layer of cells is removed. That layer regrows. Vision recovers more gradually than after LASIK, and PRK still needs enough tissue for the prescription being corrected.
Tersigni Vision is the only vision correction center in Oregon to offer the full portfolio of modern LASIK alternatives, so a PRK recommendation for a thin cornea is weighed alongside SMILE, EVO ICL and RLE. Many patients first learn about PRK during their Tersigni Vision Advanced Ocular Analysis.
Can EVO ICL correct my vision in Portland if my corneas are too thin for laser surgery?
EVO ICL can correct nearsightedness in patients whose corneas are too thin for laser surgery, because the lens is placed inside the eye and no corneal tissue is removed. The implantable collamer lens treats nearsightedness with or without astigmatism and sits behind the iris, in front of the eye’s natural lens. Candidacy depends on age and prescription. The space inside the eye is also measured before surgery.
Dr. Tersigni is the most experienced EVO ICL surgeon by volume in Oregon and has had EVO ICL himself. Tersigni Vision evaluates EVO ICL for patients ages 21 to 45, and EVO ICL is often the procedure considered when corneas are too thin for both LASIK and PRK.
Key Takeaways: LASIK With Thin or Irregular Corneas in Portland
- A thin, normally shaped cornea can still qualify for LASIK in Portland when 250 to 300 microns of untouched tissue will remain after treatment.
- Keratoconus and other conditions that weaken the cornea rule out LASIK, PRK and SMILE, and irregular astigmatism is checked for keratoconus before laser vision correction.
- PRK is the usual alternative for thin, normally shaped corneas because it reshapes the cornea without a flap and preserves more corneal tissue than LASIK.
- EVO ICL removes no corneal tissue, and Tersigni Vision evaluates it for patients ages 21 to 45 whose corneas are too thin for laser surgery.
- At Tersigni Vision in Portland, corneal thickness and shape are measured during the 90-minute Tersigni Vision Advanced Ocular Analysis before any procedure is recommended.
To find out which procedure fits your corneas, schedule a Tersigni Vision Advanced Ocular Analysis in Portland.
Steven Tersigni, MD, MPH grew up on the Oregon coast and founded Tersigni Vision, a modern vision correction boutique serving Portland from Lake Oswego.
Medically Reviewed By:
Steven Tersigni, MD
Board-Certified Ophthalmologist
Fellowship-Trained Refractive Surgeon, WCRS
Last reviewed October 12, 2026
source https://www.tersignivision.com/lasik/lasik-for-thin-or-irregular-corneas-in-portland-candidacy-and-alternatives/





