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- Title
Asymmetric All-Femtosecond Laser–Cut Corneal Allogenic Intrastromal Ring Segments.
- Authors
Bteich, Yara; Assaf, Jad F.; Gendy, Jeremiah E.; Müller, Fabian; Jacob, Soosan; Hafezi, Farhad; Awwad, Shady T.
- Abstract
Purpose: To describe a novel technique for cutting asymmetric allogenic segments using the femtosecond laser for the management of cases of keratoconus with non-coinciding astigmatism and coma axes. Methods: Four eyes of 2 patients with irregular keratoconus and asymmetric allogenic segments were included. Visual, refractive, tomographic, and aberrometric outcomes, and optical coherence tomography (OCT) sections were measured preoperatively and 6 months postoperatively. Evaluations included slit-lamp examination, manifest refraction, uncorrected (UDVA) and corrected (CDVA) distance visual acuity, and simulated and maximum anterior keratometry (Kmax) using anterior segment OCT. Results: Spherical and cylindrical refractive errors decreased from −2.38 ± 2.96 and −2.94 ± 2.16 to −1.81 ± 2.77 (P =.04) and −1.75 ± 2.07 (P =.01) diopters (D), respectively, 6 months postoperatively. There was an average gain of three lines of CDVA. Kmax decreased from 50.02 ± 1.99 to 47.89 ± 3.05 D (P=.03) and coma from 1.05 ± 0.21 to 0.21 ± 0.19 D (P =.01). Conclusions: Asymmetric femtosecond laser–cut allogenic segments allow a higher level of customization based on size, shape, and arc length, in contrast to the limited range of available synthetic asymmetrical segments. [J Refract Surg. 2023;39(12):856–862.]
- Publication
Journal of Refractive Surgery, 2023, Vol 39, Issue 12, p856
- ISSN
1081-597X
- Publication type
Article
- DOI
10.3928/1081597X-20231018-04