Abstract
To investigate the relationship between biomechanical properties of the cornea and postoperative refractive changes in patients with low-level astigmatism after cataract surgery. This prospective study recruited patients undergoing cataract surgery involving 2.8-mm superior incisions. Biomechanical properties of the cornea were evaluated preoperatively using the Ocular Response Analyzer, and corneal profiles were evaluated using a Scheimpflug system (Pentacam HR). Topographic astigmatism, total corneal aberrations (TCA) and higher-order corneal aberrations (HOCA) analyses were performed preoperatively and during 1- and 3-month postoperative exams. The incidences of surgically-induced astigmatism (SIA) and HOCAs were calculated using vector analyses. Associations of the preoperative biomechanical properties of the cornea with SIA and HOCAs were evaluated. This study included 28 eyes of 28 patients. The preoperative corneal hysteresis (CH) was 8.68 ± 1.86 mmHg, and the corneal resistance factor (CRF) was 8.66 ± 1.61 mmHg. At the 1-month postoperative evaluation, significant changes were observed in HOCAs (p=0.023), TCAs (p=0.05), astigmatism (p=0.02), and trefoil (p=0.033); in contrast, differences in coma (p=0.386) and spherical aberration (SA) were not significant (p=0.947). At the 3-month visit, significant changes were only observed in TCAs (p=0.02) and HOCAs (p=0.012). No relationships between the preoperative corneal hysteresis and corneal resistance factor and postoperative SIA and HOCA were identified, other than a positive correlation between the 3-month postoperative incidence of corneal hysteresis and spherical aberration. Despite the observed lack of relationships of preoperative biomechanical properties of the cornea with SIA and postoperative aberrations (except for SA), further studies involving larger patient groups are needed to explore the unexpected refractive deviations after cataract surgery.
Highlights
Método: Neste estudo prospectivo, recrutamos os pacientes submetidos a cirurgia de catarata com incisões superiores de 2,8 mm
The 21st century will be characterized by the development of sophisticated intraocular lenses (IOLs)
The present study aimed to investigate the effects of biomechanical properties of the cornea on refractive changes after cataract surgery in patients with low-level astigmatism
Summary
The 21st century will be characterized by the development of sophisticated intraocular lenses (IOLs) Such lenses will be developed with the basic aim of allowing patients to achieve both close and distance vision without a requirement for corrective glasses[1]. These lenses reduce internal aberrations and compensate for corneal astigmatism and aberrations, these benefits are minimized in the context of an uncorrected astigmatism exceeding 0.75 diopters (D). Submitted for publication: January 23, 2016 Accepted for publication: July 23, 2016 1 Ophthalmology Department, Ulucanlar Eye Training and Research Hospital, Ankara, Turkey. 2 Ophthalmology Department, Kafkas University Kars, Turkey. Submitted for publication: January 23, 2016 Accepted for publication: July 23, 2016 1 Ophthalmology Department, Ulucanlar Eye Training and Research Hospital, Ankara, Turkey. 2 Ophthalmology Department, Kafkas University Kars, Turkey. 3 Dünyagöz Hospital, Ankara, Turkey. 4 Kayserigöz Hospital, Kayseri, Turkey.
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