Femtosecond Laser-Assisted Intrastromal Relaxing Incisions After Penetrating Keratoplasty: Effect of Incision Depth

Wetterstrand, Olli; Holopainen, Juha M.; Krootila, Kari

doi:10.3928/1081597x-20150623-06

Cited by 6 publications

(1 citation statement)

References 24 publications

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“…In eyes after penetrating keratoplasty, Wetterstrand and colleagues 13 evaluated the correlation between the efficacy of femtosecond laser-assisted intrastromal relaxing incisions and the posterior depth of corneal incisions. Using the IntraLase femtosecond laser, paired IS arcuate incisions were made inside the graft stroma, leaving 90 μm of intact anterior cornea including epithelium.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Femtosecond Laser Intrastromal Incision Location Using Optical Coherence Tomography

et al. 2017

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Purpose Using optical coherence tomography (OCT) to evaluate the femtosecond laser intrastromal (IS) incisions made during cataract surgery to reduce corneal astigmatism. Design Retrospective case series. Subjects 77 eyes of 77 patients were included. Methods Paired IS incisions were created using the Catalys femtosecond laser (Abbott Medical Optics, Inc.). The planned IS incision parameters were 20% uncut anterior, 20% uncut posterior, midpoint depth of 50%, and 90° side cut angle. OCT scans were obtained three weeks or more postoperatively to assess these four parameters, and actual values were compared to 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% to 36.9%) for uncut anterior, 32.5% ± 8.8% (range 6.0% to 57.9%) for uncut posterior, and 42.3% ± 6.6% (range 25.5% to 65.4%) for midpoint depth, which were all significantly different from the planned parameters (all P<0.05). The mean side cut angle was 88.5° ± 5.6° (range 71° to 114°) and was significantly different from the planned side cut angle of 90° (P<0.05). In 50 eyes that had paired IS 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 IS incision midpoint depth was significantly more anterior than the planned depth of 50%. The location of paired IS incisions in each eye were not correlated. Further improvements are needed to ensure the precise location of the IS incisions made with this device.

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Section: Discussionmentioning

confidence: 99%