AIMS To determine long-term efficacy of riboflavin/ultraviolet A corneal cross-linking (CXL). METHODS Thirty patients (30 eyes) who had undergone CXL following epithelial removal 4-6 years previously were examined. RESULTS At 1-year mean, spherical equivalent error (SEQ) increased by +0.72 dioptres (D) (p<0.002), corrected distance visual acuity (CDVA) improved (p<0.005), mean simulated ker...

PURPOSE To determine the effect of using toric soft contact lenses on corneal biomechanical properties. METHODS We enrolled 33 healthy patients with mean age of 23.18 ± 4.06 and minimal cylinder power of 1 D (-1.98 ± 0.808 SD) and negative history of contact lens use; keratoconic patients were excluded from the study. Toric soft contact lenses (BIOFINITY, Comfilcon A, Coopervision, Southampto...

Swept-source optical coherence tomography (OCT) is the latest advancement in anterior segment imaging. There are limited data regarding its performance after laser in situ keratomileusis (LASIK). We compared the reliability of swept-source OCT and Scheimpflug imaging for evaluation of corneal parameters in refractive surgery candidates with myopia or myopic astigmatism. Three consecutive measur...

PURPOSE To evaluate the clinical outcomes of implantation of Ferrara intrastromal corneal ring segments (ICRS) in patients with astigmatism after penetrating keratoplasty (PKP). SETTING Private clinic, Belo Horizonte, Brazil. DESIGN Retrospective consecutive case series. METHODS Chart records of post-PKP patients who had ICRS implantation from May 2005 to September 2009 were retrospective...

前眼部光干渉断層計（OCT）のトーリックカリキュレーターにはKeratometry（K）を用いたBarrett Toric式（BT式）と、Fourier Real power Cylinder（FRCyl）を用いたCASIA Toric式（CT式）があり、両式による術後乱視誤差を検討した。

PURPOSE To analyse visual, refractive and topographic outcomes of combining transepithelial photorefractive keratectomy (tPRK) with simultaneous corneal crosslinking for the visual rehabilitation of contact lens intolerant keratoconus patients. METHODS Patients with topographically significant keratoconus, limited corrected vision and intolerant of contact lenses were prospectively recruited,...

OBJECTIVE Describe the ocular biometric parameters and their associations in a population of cataract surgery candidates. METHODS A cross-sectional study of 13,012 eyes of 6,506 patients was performed. Biometric parameters of the eyes were measured by optical low-coherence reflectometry. The axial length (AL), mean keratometry (K) and astigmatism, anterior chamber depth (ACD) (epithelium to l...

PURPOSE To evaluate staged combined treatment for keratoconus with intrastromal corneal ring segment (ICRS) implantation followed by corneal collagen crosslinking (CXL) with riboflavin-ultraviolet-A (UVA) and then toric implantable collagen copolymer phakic intraocular lens (pIOL) implantation. SETTING Large private ophthalmic hospital system. DESIGN Case series. METHODS Eyes with progres...

PURPOSE To evaluate refractive, visual, and aberrometric changes in corneas with pellucid marginal degeneration (PMD) implanted with intracorneal ring segments (ICRS) during a 6-month follow-up. DESIGN Retrospective, consecutive case series. PARTICIPANTS We included 21 consecutive eyes of 15 patients ranging in age from 21 to 73 years old and with a diagnosis of PMD. This diagnosis was made...

Objective To compare the performance of Sanders-Retzlaff-Kraft/Theoretical, Hoffer Q, Barrett Universal II, Kane, and Hill-radial basis function formulas to calculate intraocular lens power in eyes with normal axial length, terms predicting target refraction by using partial coherence interferometry technology. Methods Phacoemulsification implantation were performed 135 patients an length betwe...