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Irregular Astigmatism After Corneal Transplantation—Efficacy And

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Irregular Astigmatism After Corneal Transplantation—Efficacy And CLINICAL SCIENCE Irregular Astigmatism After Corneal Transplantation—Efficacy and Safety of Topography-Guided Treatment Inês Laíns, MD, MSc,*† Andreia M. Rosa, MD,*† Marta Guerra, MD, MSc,* Cristina Tavares, MD,* Conceição Lobo, MD, PhD,*† Maria F. L. Silva, PhD,‡ Maria J. Quadrado, MD, PhD,*† and Joaquim N. Murta, MD, PhD*† Key Words: astigmatism, corneal topography, corneal transplanta- Purpose: fi To analyze the ef cacy and safety of topography-guided tion, excimer, photorefractive keratectomy photorefractive keratectomy (TG-PRK) to treat irregular astigmatism after corneal transplantation. (Cornea 2016;35:30–36) Methods: This was a retrospective observational case series. Eyes with irregular astigmatism after penetrating keratoplasty treated with orneal transplantation (CT) is one of the most commonly TG-PRK (Allegretto Wave Eye-Q) with the topography-guided Cperformed transplant procedures throughout the world.1 customized ablation treatment protocol were included. All treatments Although it is generally successful, patients frequently present had been planned to correct the topographic irregularities, as well as with high irregular postoperative astigmatism, which pre- to reduce the refractive error after neutralizing the induced refractive cludes them from achieving satisfactory visual acuity.2 It can change. Clinical records, treatment plan, and the examinations affect up to 40% of the eyes3 and remains a challenge even for performed were reviewed and the following data were collected: experienced cornea specialists, as spectacles and rigid contact corrected and uncorrected distance visual acuities; manifest refrac- lenses often represent an unsuccessful option for visual tion; topographic parameters, and corneal endothelial cell count. rehabilitation.4 Results: We included 31 eyes [30 patients; mean age 45.0 6 13.4 In recent decades, excimer laser treatment has emerged 5 (SD) years]. At the last postoperative follow-up (mean 9.2 6 8.2 as an alternative. The conventional ablation procedures months), we observed a significant improvement in corrected (P = account only for lower-order aberrations, such as defocus fi 0.001) and uncorrected distance visual acuities (P , 0.001). There and regular astigmatism; therefore, their ef cacy is widely was a gain of $1 uncorrected distance visual acuity line in 96.8% limited for the highly aberrated post-CT corneas. When the (n = 30) of the eyes. Similarly, the refractive parameters also target is irregular astigmatism, customized ablation protocols 6 improved (cylinder P , 0.001; spherical equivalent P = 0.002). At must be considered. Currently, there are 2 options available: the last visit, 54.8% (n = 17) of the patients presented a spherical wavefront-guided and topography-guided (TG). Wavefront equivalent of 61 D. The 3-mm topographic irregularity also ablation considers the aberrations of the entire eye and assumes decreased significantly (P , 0.001). There was no significant that most, and potentially all, can be corrected by reshaping the 7 variation of the corneal endothelial cell count. cornea. However, mainly because of the limitations of the current wavefront sensors8 (aberrometers), these measurements Conclusions: This is the largest case series of TG-PRK to treat are difficult to obtain and are usually not accurate in highly irregular astigmatism in postcorneal transplantation eyes. Our results aberrated corneas.9 Additionally, this treatment protocol does confirm that TG-PRK is an efficient treatment, associated with not address their core pathology,10 as in these cases, higher- fi signi cant improvements of both visual acuity and refractive order aberrations and irregular astigmatism are mainly attrib- parameters. uted to corneal irregularities.6 Conversely, TG treatments rely only on topographic corneal height maps11 and thus can be more suitable. This 10 Received for publication June 11, 2015; revision received August 19, 2015; was highlighted in a recent review, which concluded that, accepted August 26, 2015. Published online ahead of print October 28, even with reliable wavefront measurements, in the presence 2015. of significant corneal irregularities, TG treatments may be From the *Department of Ophthalmology, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal; †Faculty of Medicine, University of Coimbra, superior. TG ablation is planned to reshape the irregular Coimbra, Portugal; and ‡Visual Neuroscience Laboratory, CNC.IBILI, cornea to a symmetric regular surface by fitting it to the best Faculty of Medicine, University of Coimbra, Coimbra, Portugal. asphere.10 The main skepticism of this approach is the The authors have no funding or conflicts of interest to disclose. theoretical lack of predictability of the final refractive Reprints: Joaquim N. Murta, MD, PhD, Department of Ophthalmology, outcome because of unknown changes induced by the Centro Hospitalar e Universitário de Coimbra, Praceta Prof. Mota Pinto, 7 3049 Coimbra, Portugal (e-mail: [email protected]). correction of irregularities. The new treatment protocols Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved. already take it into account, performing a final adjustment to 30 | www.corneajrnl.com Cornea Volume 35, Number 1, January 2016 Copyright © 2015 Wolters Kluwer Health, Inc. Unauthorized reproduction of this article is prohibited. Cornea Volume 35, Number 1, January 2016 Topography-Guided Treatment After Corneal Transplantation the manifest refractive error, but a second procedure may be charts (converted to logMAR values for analysis), manifest required to address it.12 refractive parameters (spherical equivalent, manifest cylinder Despite the current evidence that TG ablation treat- and sphere), applanation tonometry, corneal endothelial cell ments are more suitable for highly irregular corneas11 and density (cells per squared millimeter), topographic parameters therefore may represent the most appropriate option for post- (irregularities at the 3- and 5-mm zones), and central CT eyes, only small limited series4,8,11,13–15 have been pachymetry (Orbscan IIz system; Bausch & Lomb). Treat- published, and it is not widely adopted. ment characteristics were also collected, namely the maxi- To our knowledge, this study presents the largest case mum and central ablation treated, as well as the optical and series of irregular astigmatism after CT treated with ablation zones and the treated refractive error. Duration of topography-guided photorefractive keratectomy (PRK). Our follow-up and complications were also registered. aim was to evaluate the efficacy and safety of this approach. Surgical Plan and Surgical Technique MATERIALS AND METHODS All eyes had been treated with topography-guided This is a retrospective, noncomparative, consecutive customized ablation treatment (T-CAT) PRK with the Alle- case series, conducted at the Department of Ophthalmology, gretto Eye-Q 400-Hz excimer Wavelight (Germany) (wave- Centro Hospitalar e Universitário de Coimbra, Coimbra, length: 193 nm, pulse duration: 12 nanoseconds, repetition rate: Portugal. Before TG surgery, all patients were informed 400 Hz). TG-PRK was always performed at least: 12 months about the risks and benefits of the procedure. All patients after CT; 6 months after the removal of the last sutures—sutures signed an informed consent form in accordance with the were removed in the steepest meridian when topographic Declaration of Helsinki, in which they agreed that their astigmatism (Orbscan IIz system; Bausch & Lomb) was equal clinical data could be included in scientific studies. or superior to 3 diopters (D). If the astigmatism remained high despite this approach, all sutures were removed; 6 months of confirmed refractive stability, defined as less than 0.50 D Study Design and Population change; and adequate corneal thickness. Eyes submitted to TG-PRK were identified in our All surgical plans were performed by the same surgeon database, and their clinical records were reviewed. Only (A.M.R.), based on data obtained using the Allegretto Top- subjects who fulfilled the following inclusion criteria were olyzer (Germany). This is a Placido-based system with 11 considered for this study: (1) TG-PRK performed according rings that generates 22,000 measuring points and has an to the protocol described below, because of irregular integrated keratometer. It provides several topographic maps, astigmatism caused by CT; (2) Minimum follow-up of 6 which should be similar to each other. Up to 8 maps are months; (3) Availability in the preoperative evaluation and averaged by the system, and the percentage of the data the last appointment of corneal topography and pachymetry contained in the chosen optical zone is displayed. Highly obtained with the Orbscan IIz system (Bausch & Lomb, irregular corneas after CT, without a specific pattern of Rochester, NY), and the corneal endothelial cell count astigmatism, were treated as long as more than 90% of their obtained with the Topcon specular microscope. Irregular area was acquired (maps with less than 90% of data are astigmatism was considered as the presence of spectacle excluded automatically) and data were reproducible in 8 corrected distance visual acuity (CDVA) of one or more lines topographic maps. Eyes that did not fulfill these criteria were less than the visual acuity with a rigid contact lens or pinhole, not submitted to this treatment. To perform the surgical plans, 7 coupled with the presence of topographic changes—either the following protocol was followed stepwise : unequal slopes of hemimeridians
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