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. 2023 Jun 27;12(13):4311.
doi: 10.3390/jcm12134311.

One-Year Results of Photorefractive Keratectomy for Myopia and Compound Myopic Astigmatism with 210 nm Wavelength All Solid-State Laser for Refractive Surgery

Anna M Roszkowska  1   2 , Giuseppe Tumminello  1 , Carmelo Licitra  1 , Alice A Severo  1 , Leandro Inferrera  1   3 , Umberto Camellin  1 , Domenico Schiano-Lomoriello  4 , Pasquale Aragona  1
Affiliations

One-Year Results of Photorefractive Keratectomy for Myopia and Compound Myopic Astigmatism with 210 nm Wavelength All Solid-State Laser for Refractive Surgery

Anna M Roszkowska et al. J Clin Med. .

Abstract

Background: To examine the 12-month clinical and refractive outcomes of PRK performed with a UV all-solid-state laser.

Methods: The study included healthy patients with myopia and/or compound myopic astigmatism enrolled for refractive surgery and treated with PRK using a 210 nm wavelength, 2 kHz repetition rate, UV all-solid-state laser (LaserSoft, Katana Technologies GmbH, Kleinmachnow, Germany). All subjects were examined at baseline and after 1, 3, 6, and 12 months after the treatment with a slit lamp, refraction, visual acuity assessment (logMAR chart), tonometry, ophthalmoscopy, and corneal tomography with a Scheimpflug camera. The outcome measures considered were uncorrected (UDVA) and corrected (CDVA) distance visual acuities, refraction, central corneal thickness, and transparency. The efficacy, safety, predictability, and stability were determined.

Results: The study included 34 eyes of 19 patients. The mean UDVA changed from 1.20 ± 0.43 to -0.05 ± 0.10 logMAR at 12 months, and the mean CDVA changed from -0.03 ± 0.06 to -0.06 ± 0.09 logMAR, respectively. The mean spherical equivalent (SE) changed from -4.90 ± 2.12 D to -0.01 ± 0.40 D and was within ±0.50 D of the intended correction in 91% of eyes and within ±1.00 D in 97% of eyes at 12 months. No eyes lost lines of visual acuity, and 64% of eyes gained one or more lines.

Conclusions: PRK with the 210 nm wavelength, 2 kHz repetition rate, all-solid-state laser LaserSoft system proved to have good visual, refractive, and clinical outcomes after the follow-up at 12 months. The emerging gas-free, solid-state technology might be considered a valid alternative for the gas operating lasers for corneal refractive surgery.

Keywords: 210 nm wavelength; photorefractive keratectomy; refractive surgery; solid-state laser.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Visual outcomes after photorefractive keratectomy (PRK) with solid-state laser (LaserSoft, Katana Technologies GmbH, Kleinmachnow, Germany). (A) Cumulative 12-month postoperative uncorrected distance visual acuity (UDVA) and preoperative corrected distance visual acuity (CDVA). (B) Changes in Snellen lines of preoperative and postoperative CDVA. (C) Attempted vs. achieved spherical equivalent refraction. (D) The accuracy of spherical equivalent refraction (SEQ) to the intended target at 12 months after surgery. Black line: equality. Space between the two green lines: error range within 0.5D. Space between the two purple lines: error range within 1D. (E) Comparative distribution of preoperative and 12-month postoperative refractive cylinder. (F) Stability of spherical equivalent refraction at 1, 3, 6, and 12 months after surgery. (G) Percentages of preoperative and postoperative refractive cylinder at 12 months.
See this image and copyright information in PMC

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