Eye Test For Laser Eye Surgery | Select carefully

Yesterday, we evaluated a patient who was being considered for Femto-LASIK. The refractive error was approximately −7.25 D in the right eye and −4.00 D in the left eye, with approximately −2.00 D in the other meridian of the left eye.

At first glance, this appeared to be a case where laser vision correction could potentially provide significant freedom from glasses. However, refractive power is only one part of the decision-making process before LASIK.

The more important question was whether the patient’s cornea was suitable and sufficiently safe for tissue-removing refractive surgery.

Why the Right Eye Raised Concern

During the preoperative assessment, we carefully reviewed the pachymetry, corneal topography and Sirius Contoura assessment of the right eye.

The corneal shape and maximum K readings raised significant concerns. Although, technically, we could have calculated a treatment plan that left a residual stromal bed of approximately 300–310 µm, we did not want to base the decision on residual stromal bed thickness alone.

This is an important distinction in LASIK patient selection.

Why We Chose Not to Operate

Once corneal stromal tissue is removed during LASIK, it cannot simply be restored. Therefore, when preoperative corneal tomography, topography and pachymetry raise concerns about the safety of tissue removal, the safest decision may be to avoid surgery.

We explained our concerns clearly to the patient and apologized that we could not safely proceed with Femto-LASIK at this stage.

This was not a decision based only on the amount of refractive error or the calculated residual stromal bed. It was a decision based on the overall corneal risk profile.

Looking for a Safer Refractive Option

Rather than proceeding simply because the refractive error could technically be treated, we plan to reassess the case carefully and consider other refractive options that may be more appropriate for this particular cornea.

This case is a useful reminder that LASIK candidacy is individualized. Corneal shape, pachymetry, tomography, refractive error, optical zone requirements and other risk factors should be considered together before deciding on surgery.

Patients with unfavorable preoperative findings may be at greater risk of postoperative visual quality problems such as halos, glare, starbursts or regression. These complications are not inevitable, but careful patient selection is one of the most important principles of safe refractive surgery.

The Take-Home Message

For patients considering LASIK, Femto-LASIK or SMILE, a low residual stromal bed is not, by itself, proof that the eye is safe to operate on.

Sometimes the best refractive surgery decision is to say no.

In this case, choosing not to proceed with Femto-LASIK was part of our responsibility to the patient: protecting the cornea and preserving long-term visual quality comes before correcting the refractive error.