BACKGROUND The study is a retrospective review of the pattern of refractive errors in presbyopic patients seen in the eye clinic from January to December, 2009. PATIENTS AND METHODS The clinic refraction register was used to retrieve the case folders of all patients refracted during the review period. Information extracted includes patient's age, sex, and types of refractive error. Unaided an...

BACKGROUND To determine the change in refractive error and the incidence of myopia among school-aged children in the Yongchuan District of Chongqing City, Western China. METHODS A population-based cross-sectional survey was initially conducted in 2006 among 3070 children aged 6 to 15 years. A longitudinal follow-up study was then conducted 5 years later between November 2011 and March 2012. R...

The purpose of this letter is to present a simplified mathematical model of progressive myopia. A proposed hypothesis for refractive error development of the human eye requires that there is an optical signal related to the amount of refractive error which would in turn correct the refractive error of the eye. A specific first-order feedback system, defined by the transfer function F (s) = 1 / ...

INTRODUCTION Refractive errors are a major cause of visual impairment in the population. PURPOSE To find the pattern of refractive errors among patients evaluated in a tertiary care hospital in the western region of Nepal. MATERIALS AND METHODS The present hospital-based retrospective study was conducted in the Department of Ophthalmology of the Manipal Teaching Hospital, situated in Pokhar...

PURPOSE To assess the regression rate of conductive keratoplasty (CK) in patients with or without previous laser-assisted in situ keratomileusis (LASIK) or photorefractive keratectomy (PRK). SETTING University of Utah, Medical School, John A. Moran Eye Center, Salt Lake City, Utah. MATERIALS AND METHODS A retrospective, age-matched chart review identified records of 6 patients who underwent...

PURPOSE To assess the effects of systemic propranolol on refractive error in infants with periocular capillary hemangiomas. METHODS A single-center study of consecutive patients with capillary hemangiomas treated with systemic propranolol. Refractive data were analyzed using Long's matrix formalism and the methods of Harris and Kaye. RESULTS Seventeen patients were included. At 6 months pos...

Refractive errors are frequently found following cataract surgery and refractive lens exchange. Accurate biometric analysis, selection and calculation of the adequate intraocular lens (IOL) and modern techniques for cataract surgery all contribute to achieving the goal of cataract surgery as a refractive procedure with no refractive error. However, in spite of all these advances, residual refra...