Li Wang1, Lai Jiang1, Katie Hallahan1, Zaina N Al-Mohtaseb1, Douglas D Koch2. 1. Cullen Eye Institute, Department of Ophthalmology, Baylor College of Medicine, Houston, Texas. 2. Cullen Eye Institute, Department of Ophthalmology, Baylor College of Medicine, Houston, Texas. Electronic address: dkoch@bcm.edu.
Abstract
PURPOSE: To use optical coherence tomography (OCT) to evaluate the femtosecond laser intrastromal incisions made during cataract surgery to reduce corneal astigmatism. DESIGN: Retrospective case series. PARTICIPANTS: Seventy-seven eyes of 77 patients. METHODS: Paired intrastromal incisions were created using the Catalys femtosecond laser (Abbott Medical Optics, Inc., Santa Ana, CA). The planned intrastromal incision parameters were 20% uncut anterior, 20% uncut posterior, midpoint depth of 50%, and 90° side cut angle. Optical coherence tomography scans were obtained 3 weeks or more after surgery to assess these 4 parameters, and actual values were compared with intended values. MAIN OUTCOME MEASURES: Percentages of uncut anterior and posterior tissue, midpoint depth, and degrees of side cut angle. RESULTS: The mean values were 17.2±5.8% (range, 7.2%-36.9%) for uncut anterior, 32.5±8.8% (range, 6.0%-57.9%) for uncut posterior, and 42.3±6.6% (range, 25.5%-65.4%) for midpoint depth, which all were significantly different from the planned parameters (all P < 0.05). The mean side cut angle was 88.5°±5.6° (range, 71°-114°) and was significantly different from the planned side cut angle of 90° (P < 0.05). In 50 eyes that had paired intrastromal incisions scanned by the OCT, there was no correlation between the paired incisions for midpoint depth and side cut angle (correlation coefficient, r = -0.063 and -0.067, respectively; P > 0.05). CONCLUSIONS: The intrastromal incision midpoint depth was significantly more anterior than the planned depth of 50%. The locations of paired intrastromal incisions in each eye were not correlated. Further improvements are needed to ensure the precise location of the intrastromal incisions made with this device.
PURPOSE: To use optical coherence tomography (OCT) to evaluate the femtosecond laser intrastromal incisions made during cataract surgery to reduce corneal astigmatism. DESIGN: Retrospective case series. PARTICIPANTS: Seventy-seven eyes of 77 patients. METHODS: Paired intrastromal incisions were created using the Catalys femtosecond laser (Abbott Medical Optics, Inc., Santa Ana, CA). The planned intrastromal incision parameters were 20% uncut anterior, 20% uncut posterior, midpoint depth of 50%, and 90° side cut angle. Optical coherence tomography scans were obtained 3 weeks or more after surgery to assess these 4 parameters, and actual values were compared with intended values. MAIN OUTCOME MEASURES: Percentages of uncut anterior and posterior tissue, midpoint depth, and degrees of side cut angle. RESULTS: The mean values were 17.2±5.8% (range, 7.2%-36.9%) for uncut anterior, 32.5±8.8% (range, 6.0%-57.9%) for uncut posterior, and 42.3±6.6% (range, 25.5%-65.4%) for midpoint depth, which all were significantly different from the planned parameters (all P < 0.05). The mean side cut angle was 88.5°±5.6° (range, 71°-114°) and was significantly different from the planned side cut angle of 90° (P < 0.05). In 50 eyes that had paired intrastromal incisions scanned by the OCT, there was no correlation between the paired incisions for midpoint depth and side cut angle (correlation coefficient, r = -0.063 and -0.067, respectively; P > 0.05). CONCLUSIONS: The intrastromal incision midpoint depth was significantly more anterior than the planned depth of 50%. The locations of paired intrastromal incisions in each eye were not correlated. Further improvements are needed to ensure the precise location of the intrastromal incisions made with this device.
Authors: Tommy C Y Chan; George P M Cheng; Zheng Wang; Clement C Y Tham; Victor C P Woo; Vishal Jhanji Journal: Am J Ophthalmol Date: 2015-05-14 Impact factor: 5.258
Authors: Mario Augusto Pereira Dias Chaves; André Lins de Medeiros; César Martins Cortez Vilar; Klayne Rafaella Pereira Magalhães; Michelle Rodrigues Gonçalves; Patrick Frenzel de Moraes Tzelikis; Wilson Takashi Hida; Pedro Carlos Carricondo; Milton Ruiz Alves Journal: Clin Ophthalmol Date: 2019-02-14