Even patients with no risk factors can develop ectasia. There is no current way to eliminate the risk entirely, according to Steven C. Schallhorn, MD.
Reviewed by Steven C. Schallhorn, MD
Researchers are considering a number of factors to determine if they could be used to assess what eyes may be at a higher at risk of developing ectasia.
Steven C. Schallhorn, MD, and colleagues performed a study of a large number of consecutive primary LASIK treatments (over 300,000 procedures performed between 2007 and 2011). Of that cohort, a number of patients experienced ectasia (213 eyes in 155 patients).
The researchers first looked at age and found that LASIK patients who developed ectasia tended to be younger than the overall population of those who underwent LASIK. But 38% of ectasia patients were over the age of 30 at the time of surgery.
So, while an older patient may be less likely to develop the condition, it certainly can still occur in older patients
The next factor examined was central corneal thickness. Patients that developed ectasia tended to have slightly thinner corneas than the rest of the cohort.
However, over 80% of ectasia patients had a central corneal thickness greater than 510 μm. So again, while a patient with a thick central cornea may appear to be less likely to develop ectasia, ectasia was observed with a corneal thickness of 600 μm.
The group next considered the thickness of the residual stromal bed.
Steven C. Schallhorn, MD
E: [email protected]
Dr. Schallhorn is chief medical officer for Carl Zeiss Meditec and medical advisor to Optical Express.