PURPOSE: To evaluate biomechanical changes measured with the ORA (Ocular Response Analyzer®; Reichert Ophthalmic Instruments, Buffalo, New York, USA) after Lasik with the Moria One Use Plus and to compare the biomechanics changes after myopic and hyperopic ablations. METHODS: Fourteeneyes for hyperopia (H) and 19 eyes for myopia (M) were evaluated with the ORA preoperatively and 1 month after Lasik with thin flap (100 microns) using SBK-OUP (Sub-Bowman Keratomileusis – One Use Plus, Moria®).CH (Corneal Hysteresis), CRF (Corneal Resistance Factor), […]

A case report of a 59 years old woman who has had ocular primary melanosis for four years, associated with episodes of corneal epithelial recurrent erosions. The patient underwent resection of the affected conjunctiva, superficial keratectomy and topical mitomicin C after the surgery. The pathologic examination confirmed the diagnosis of primary acquired melanosis, with mild to moderate nuclear atypia. One year after the treatment, she had only a small area of pigmented epithelium located in the lower corneal surface, showing […]

PURPOSE: To compare topographic features of patients with keratoconus between two systems: Orbscan IIz® (Bausch & Lomb, Rochester, New York, USA) and Wavetek Chroma®. METHODS: Twenty-nine patients that were diagnosed with keratoconus based on clinical and topographic characteristics were evaluated on their visit to Ophthalmology Hospital of Sorocaba in March 2010. Topographic variables, like maximum and minimum keratometric readings (Sim K) within 3 and 5 mm of central zone, and maximum keratometry, were analyzed by Orbscan IIz® and Wavetek Chroma®. […]

PURPOSE: To verify the morning to evening variations of refraction, visual acuity, intraocular pressure and biomechanical parameters on patients operated by radial keratotomy who presented for refractive re-treatments; and to correlate the biomechanical parameters with refraction, visual acuity and their variations among morning and evening. METHODS: 19 patients were examined, respectively thirty-eight eyes in the morning (9 am) and evening (6 pm), recording sphere-cylindrical dynamic refraction, visual acuity (logMAR) without correction (AVsc) and corrected (AVcc) and ORA (Ocular Response Analyzer) […]

PURPOSE: Measure of efficacy and the security of intraoperative of mitomycin C (MMC) in the pterygium surgery. METHODS: Realized prospective analysis of 102 patients (204 eyes) divided in two groups submitted intraoperative MMC 0.02 % for 2 minutes or saline solution 0.9%. The patients were available in 1º, 7 º, 21º, 30º, 60º and 90º days of postoperative. RESULTS: The pterygium was more prevalence in females (58,33%). The age various 33 to 69 years. The recidive (9) was in the […]

Case report of a patient, with a thick cornea, for Fuchs dystrophy in its early stages, yet with preserved corneal transparency (subclinical corneal edema), associated with normal intraocular pressure (IOP) by Goldman applanation tonometry (GAT), which was however, the diagnosis of primary open-angle glaucoma on the basis of structural changes of the optic nerve. The tomographic study showed a pattern of spatial pachymetry compatible with subclinical edema. The corneal biomechanical study with ORA (Ocular Response Analyzer, Reichert ®) associated with […]

OBJECTIVE: To verify possible correlations between the biomechanical state of the cornea before surgery and the results of stromal ring segments implant for keratoconus. METHODS: Nineteen eyes of 19 patients with keratoconus were evaluated before and 12 months after stromal ring segment implant surgery. The implant of one or two Ferrara ring segments was performed accordingly to the nomogram, considering corneal thickness, ectasy pattern on topography and astigmatism. The Wilcoxon test was performed to verify the differences between visual acuity […]

PURPOSE: To assess the repeatability of central corneal thickness measurement at the geometrical center (Central Corneal Thickness – CCT) given by the Pentacam High Resolution (HR) Comprehensive Eye Scanner (Oculus, Wetzlar, Germany) over time. METHODS: Prospective, single center, observational study. Two separate CCT measurements were taken by the Pentacam corneal tomography exam (CTm) 3 to 12 months apart, and compared. RESULTS: One hundred and sixteen eyes (n=116) of 62 health patients were included in this study. Average CCT in first […]