A 32-year-old man planned to have laser in situ keratomileusis (LASIK) in both eyes. The preoperative manifest refraction was 6.50 + 1.00 80 in the right eye and 6.25 + 1.00 90 in the left eye, yielding a visual acuity of 20/20 in both eyes. Topography was normal. Ultrasound pachymetry was 581 mm in the right eye and 574 mm in the left eye. The LASIK procedure was performed with a femtosecond l...

Corneal refractive surgeries for the correction of myopia, hyperopia, astigmatism and hyperopia are quick and effective procedures, and have been growing in popularity over the last two decades. However, post-surgery corneal ectasia remains one of the most feared surgical complications. This is where the biomechanical integrity of the cornea begins to fail, with progressive thinning of the stro...

PURPOSE To compare the accuracy of intraocular lens (IOL) power calculation using conventional regression formulae or the American Society of Cataract and Refractive Surgery (ASCRS) IOL power calculator for previous corneal refractive surgery. METHODS We retrospectively reviewed 96 eyes from 68 patients that had undergone cataract surgery after keratorefractive surgeries. We calculated the fo...

A major story of the last 2 decades of the 20th century has been the emergence of refractive surgery. Initially extremely controversial, with modest predictability and debatable safety and long-term stability, surgical modification of corneal curvature has come to be well accepted by the profession and the public. The number of these procedures that will be performed in 2000 may exceed 1.5 mill...

Presbyopia corrections traditionally have been approached with attempts to exchange power, either at the cornea or the lens planes, inducing multifocality, or altering asphericity to impact the optical system. Treatments that affect the visual axis, such as spectacle and contact lens correction, refractive surgeries, corneal onlays and inlays, and intraocular lenses are typically unable to rest...

PURPOSE To investigate whether the gradual improvement in unaided visual acuity commonly seen after laser refractive surgery is attributable, in part, to neural adaptation to blur. METHODS Unaided logMAR visual acuity was measured at presentation (blur adapted) and immediately after refraction and removal of refractive correction (correction adapted) in 26 patients with low myopic residual re...

Purpose. To investigate refractive changes after strabismus correction procedures among adults. Methods. Retrospective chart review of adult patients who had horizontal recti muscles surgery with preoperative and postoperative cycloplegic refraction measurements. The preoperative refraction was mathematically subtracted from the postoperative refraction, and the induced refractive changes were ...

PURPOSE To analyze the possible predisposing factors of lawsuits involving ophthalmologists. METHODS Retrospective study of 70 lawsuits involving the practice of Ophthalmology. The patient's gender, age, medical and ophthalmic history were reviewed. The eye disorder that generated the prosecution, the pre-existing ophthalmic diagnosis, the preoperative exams and the operating room data were a...

There is a long history of corneal refractive surgery. Leonardo Da Vinci in 1508 said the theory of refractive errors. The first systematic analysis of the nature and results of refractive errors came from Francis Cornelius Donders. His classic treatise, “On the anomalies of accommodation and refraction of the eye”, outlined the fundamental principles of physiological optics. Ironically, in thi...