Nonpenetrating femtosecond laser intrastromal astigmatic keratotomy in eyes having cataract surgery

Abstract

Dr. Day was supported by the National Institute for Health Research (NIHR) Biomedical Research Centre based at Moorfields Eye Hospital NHS Foundation Trust and UCL Institute of Ophthalmology. Dr. Stevens has been a consultant to Optimedica Inc., now part of Abbott Medical Optics.

Non-Penetrating Femtosecond Laser Intrastromal Astigmatic Keratotomy Performed during Laser-Assisted Cataract Surgery: Results on Keratometric Astigmatism

“…This analysis revealed a trend to undercorrection, with a mean DV value of 0.57 ± 0.34 D 3 months postoperatively. This trend has been also reported in previous studies [13] [16]. In our series, this trend to undercorrection was maintained during the 12-month follow-up.…”

“…Comparable to our study, Löffler et al [8] have recently reported a reduction of the magnitude of anterior corneal astigmatism in a prospective study enrolling 27 healthy corneas undergoing penetrating femtosecond laser-assisted keratotomy, with minimal effect on the magnitude of posterior corneal astigmatism. Chan et al [11] The reduction in corneal topographic astigmatism was associated with a reduction in refractive cylinder, as observed in other studies evaluating the effect of femtosecond-assisted ISAK in virgin [13], post-refractive surgery [18], and post-keratoplasty corneas [9] [10] [15]. Day and colleagues [13] found in a prospective case series including 196 eyes undergoing femtosecond laser-assisted ISAK that 0% of the eyes had a refractive cylinder of 0.50 D or less preoperatively, with an increase to 32.1% postoperatively.…”

“…Chan et al [11] The reduction in corneal topographic astigmatism was associated with a reduction in refractive cylinder, as observed in other studies evaluating the effect of femtosecond-assisted ISAK in virgin [13], post-refractive surgery [18], and post-keratoplasty corneas [9] [10] [15]. Day and colleagues [13] found in a prospective case series including 196 eyes undergoing femtosecond laser-assisted ISAK that 0% of the eyes had a refractive cylinder of 0.50 D or less preoperatively, with an increase to 32.1% postoperatively. In our sample, better outcomes were obtained, with 38.1% and 52.4% of eyes having a manifest cylinder of 0.50 D or lower preoperatively and at 1 month after surgery, respectively.…”

“…In our series, this trend to undercorrection was maintained during the 12-month follow-up. Similarly, Day and colleagues [13] found in a group of eyes undergoing ISAK a mean DV of 0.74 ± 0.38 D (range 0.00 to 2.25 D), with a mean corneal astigmatism correction of 63%. It should be considered that although the first corneal surface is the main source of astigmatism in healthy eyes, there are also other sources of astigmatism, such as the posterior corneal surface or the crystalline lens.…”

A Pilot Study To Compare Using Verion Imaging Guided System (Alcon) To Manual Marking In Assisting LRI (Limbal Relaxation Incision) To Reduce Cylinder Power In Cataract Surgery

“…In the study that compare multifocal toric IOL and multifocal IOL with LRI, the toric IOL still showed more predictable than LRI in multifocal IOLs [16]. Recently, LRI can also be performed by Femtosecond laser in laser assisted cataract surgery [17,18]. Despite the accuracy of the optical coherence tomography-guided LRI with femtosecond laser, there was a case report of corneal perforation [19].…”