Article

Thin-flap LASIK safe and predictable, study finds

Author(s):

Muscat, Sultanate of Oman-The Carriazo-Pendular microkeratome (Schwind eye-tech-solutions) has been shown to be safe and to produce flaps of predictable thickness with two different cutting head sizes and two different suction ring sizes in a large, multicenter European study.

Maria Clara Arbelaez, MD, Muscat Eye Laser Center, Muscat, Sultanate of Oman, plus Rainer Wiltfang, MD, and Martin Bechmann, MD, Smile Eyes Laser Eye Clinic, Munich, Germany, conducted a study in which they performed 1,354 LASIK procedures using the microkeratome to create the flaps.

In this study, the 110- and 130-µm heads were used. Data were analyzed based on the choice of the suction rings, 9 or 10 mm. A total of 667 eyes underwent LASIK at the Smile Eyes clinic, and 687 eyes were treated at the Muscat Eye Laser Center.

All eyes in the study were healthy and had not previously undergone a refractive procedure. The preoperative corneal thicknesses ranged from 500 to 679 µm. Patients with K-readings ranging from 38.88 to 48.32 D were treated. One blade was used to make one cut. The corneal thickness was measured with ultrasound pachymeter before and during the procedure; the difference between the two was taken as the flap thickness.

When the investigators combined the data from both surgical sites, they found that in the 406 eyes treated with the 110-µm head, the mean flap thickness was 107 ± 12.4 µm (range, 71 to 155 µm). In the 948 eyes treated with the 130-µm head, the mean flap thickness was 128 ± 13.9 µm (range, 86 to 171 µm) (See Figures 1 and 2.)

Commenting on these results, Dr. Arbelaez said, "With the 130-µm head, we achieved an 83% probability that the mean flap thicknesses using the two suction rings are identical. With the 110-µm head, we achieved a 91% probability that the mean flap thicknesses using the two suction rings are identical. This shows that the choice of suction ring does not affect the mean flap thickness."

The investigators found a significant correlation (p < 0.01) between the preoperative corneal thickness and the corneal flap thickness. The slopes of the trend lines for both heads were 0.13 (parallel trend lines), meaning that for each 100-µm change in the preoperative corneal thickness, the flap thickness changed by 13 µm.

A significant correlation (p < 0.01) also was observed between the average K-reading and the corneal flap thickness.

Newsletter

Don’t miss out—get Ophthalmology Times updates on the latest clinical advancements and expert interviews, straight to your inbox.

Related Videos
Lisa Nijm, MD, says preoperative osmolarity testing can manage patient expectations and improve surgical results at the 2025 ASCRS annual meeting
At the 2025 ASCRS Annual Meeting, Weijie Violet Lin, MD, ABO, shares highlights from a 5-year review of cross-linking complications
Maanasa Indaram, MD, is the medical director of the pediatric ophthalmology and adult strabismus division at University of California San Francisco, and spoke about corneal crosslinking (CXL) at the 2025 ASCRS annual meeting
(Image credit: Ophthalmology Times) ASCRS 2025: Taylor Strange, DO, assesses early visual outcomes with femto-created arcuate incisions in premium IOL cases
(Image credit: Ophthalmology Times) ASCRS 2025: Neda Shamie, MD, shares her early clinical experience with the Unity VCS system
Patricia Buehler, MD, MPH, founder and CEO of Osheru, talks about the Ziplyft device for noninvasive blepharoplasty at the 2025 American Society of Cataract and Refractive Surgeons (ASCRS) annual meeting
(Image credit: Ophthalmology Times) ASCRS 2025: Bonnie An Henderson, MD, on leveraging artificial intelligence in cataract refractive surgery
(Image credit: Ophthalmology Times) ASCRS 2025: Gregory Moloney, FRANZO, FRCSC, on rotational stability
Sheng Lim, MD, FRCOphth, discusses the CONCEPT study, which compared standalone cataract surgery to cataract surgery with ECP, at the 2025 ASCRS Annual Meeting.
(Image credit: Ophthalmology Times) ASCRS 2025: Steven J. Dell, MD, reports 24-month outcomes for shape-changing IOL
© 2025 MJH Life Sciences

All rights reserved.