PURPOSE To investigate the refractive and biometric changes associated with adult-onset and adult-progression of myopia in an occupational group. METHODS The sample population consisted of 251 clinical microscopists aged 21 to 63 years. Subjects had their refraction and ocular dimensions measured on four occasions during a 2-year period, and a total of 166 subjects (332 eyes) completed the lo...

Background: High astigmatisms are usually induced during corneal suturing subsequent to tissue transplantation or any other surgery which involves corneal suturing. One of the reasons is that the procedure is intimately dependent on the surgeon's skill for suturing identical stitches. In order to evaluate the influence of the irregularity on suturing for the residual astigmatism, a prototype fo...

BACKGROUND The rabbit is a common animal model for ophthalmic research, especially corneal research. Ocular structures grow rapidly during the early stages of life. It is unclear when the rabbit cornea becomes mature and stabilized. We investigated the changes of keratometry, refractive state and central corneal thickness (CCT) with age. In addition, we studied the intra- and inter-observer rep...

BACKGROUND Biometric procedures such as keratometry performed shortly after contact procedures like gonioscopy and applanation tonometry could affect the validity of the measurement. This study was conducted to understand the short-term effect of gonioscopy on corneal curvature measurements and surface topography based Simulated Keratometry and whether this would alter the power of an intraocul...

PURPOSE To investigate the effects of constant flickering light on refractive development, the role of serotonin (i.e.5-hydroxytryptamine, 5-HT)and 5-HT2A receptor in myopia induced by flickering light in guinea pigs. METHODS Forty-five guinea pigs were randomly divided into three groups: control, form deprivation myopia (FDM) and flickering light induced myopia (FLM) groups(n = 15 for each g...

Pentacam Keratometric Values Unreliable for IOL Power Calculation After Refractive Surgery To the Editor: We read with interest the article by Gonen et al,1 which appeared in the August 2012 issue of the Journal of Refractive Surgery, on their study comparing keratometric data from 200 patients evaluated for refractive surgery using four different devices—an automated keratometer (KR 8800 [Topc...

in the retrospective investigation titled “risk factors evaluation of threshold retinopathy of prematurity” at a tertiary ophthalmic center in tehran, iran, the authors have studied 859 premature neonates during one year (2008-2009). 791 eyes have had retinopathy of prematurity (rop) and 7.4% of them presented threshold retinopathy (trop). the investigators aim has been to present and compare t...