A pilot study: LASEK with the Triple-A profile of a MEL 90 for mild and moderate myopia

Abstract

BackgroundTo investigate the visual and refractive outcomes in patients with mild to moderate myopia after laser-assisted subepithelial keratectomy (LASEK) using the 500 Hz pulse rate of the Triple-A profile.MethodsThirty-six eyes of 20 patients (mean age, 27.5 ± 4.6 years) were included in this prospective, consecutive study. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), corneal topography, and corneal aberrations were measured preoperatively and 1 day, 1 week, 1, 3 and 6 months post-operation.ResultsAt 1 week after surgery, UDVA was better than or equal to 20/25 in all eyes. At postoperative 6 months, the efficacy and safety index was 1.05 ± 0.13 and 1.12 ± 0.15, respectively; all eyes had a UDVA of 20/20 or better, and no eyes showed a loss in CDVA; 100% of the eyes were within ±1.00 D of the attempted spherical equivalent (SE) correction.ConclusionThe postoperative results indicate that using the Triple-A ablation profile of the MEL 90 excimer laser with a 500 Hz pulse rate is a safe, efficient, and predictable method to correct mild to moderate myopia.

Comparison of refractive outcomes after photorefractive keratectomy with different optical zones using Mel 90 excimer laser

“…Current laser ablation techniques have developed with an increase in frequency and improved tracking system enabling more precise corneal surface remodeling [5]. Furthermore, customized optic design has reduced postoperative mechanical complications and pain, and yielded faster recovery times with better clinical outcomes [6,8,23].…”

“…Photorefractive keratectomy (PRK) was introduced in 1983, and has become a safe and effective method for treating myopia [ 1 – 4 ]. The Mel 90 excimer laser with the advanced ablation algorithm (Triple-A) profile, developed by Carl Zeiss Meditec AG, was reported to achieve better visual acuity outcomes with lower ablation depth, and has frequencies up to 500 Hz with better a tracking system than previous excimer lasers [ 5 ]. Further optical design has been customized to reduce spherical aberration and irregular astigmatism [ 6 – 8 ].…”

“…Recent studies have reported various clinical outcomes after laser refractive surgery with a 6.5 mm optical zone [ 5 , 19 – 21 ], and one study compared a 6.0 mm optical zone with a 6.5 mm optical zone in terms of aberration values after PRK. In that study, the 6.5 mm optical zone group had a lower root mean square of higher order aberrations (RMS of HOAs) than the 6.0-mm optical zone group until 3 months postoperatively [ 22 ].…”

Comparison of refractive outcomes after photorefractive keratectomy with different optical zones using Mel 90 excimer laser

“…Photorefractive keratectomy (PRK) was introduced in 1983, and has become a safe and effective method for treating myopia [1][2][3][4]. The Mel 90 excimer laser with the advanced ablation algorithm (Triple-A) pro le, developed by Carl Zeiss Meditec AG, was reported to achieve better visual acuity outcomes with lower ablation depth, and has frequencies up to 500 Hz with better a tracking system than previous excimer lasers [5].…”

“…Recent studies have reported various clinical outcomes after laser refractive surgery with a 6.5 mm optical zone [5,[19][20][21], and one study compared a 6.0 mm optical zone with a 6.5 mm optical zone in terms of aberration values after PRK. In that study, the 6.5 mm optical zone group had a lower root mean square of higher order aberrations (RMS of HOAs) than the 6.0-mm optical zone group until three months postoperatively [22].…”