PURPOSE To evaluate the agreement between total corneal astigmatism calculated by vector summation of anterior and posterior corneal astigmatism (TCAVec) and total corneal astigmatism measured by ray tracing (TCARay). METHODS This study enrolled a total of 204 right eyes of 204 normal subjects. The eyes were measured using a Galilei double Scheimpflug analyzer. The measured parameters include...

BACKGROUND The aim of this study was to evaluate long-term efficacy, safety, stability, and predictability of photorefractive keratectomy (PRK) as treatment of astigmatism. MATERIAL/METHODS Ninety-four eyes of 52 patients, treated with PRK for compound myopic astigmatism, compound hyperopic astigmatism, and mixed astigmatism were studied during a 36-month period. Main outcome measures were un...

AIM The purpose of this study was to investigate the prevalence of astigmatism among a paediatric population. MATERIALS AND METHODS A total of 322 consecutive patients of the department of Orthodontics and Gnathology, Dental Clinic, University of L'Aquila, were enlisted for the study and 176 were selected according to the exclusion criteria. Pre- treatment diagnostic data, which included radi...

The article “Surgically Induced Astigmatism Assessment: Comparison Between Three Corneal Measuring Devices” by Ofir et al.1 was effective in demonstrating equivalence between three anterior corneal measuring devices (Lenstar LS900, Haag-Streit, Koeniz, Switzerland; IOLMaster 500, Carl Zeiss Meditec, Dublin, CA; and Atlas topographer, Carl Zeiss Meditec) by assessing the vectorial astigmatism ch...

Aims: To analyse the outcome of DALK in patients with keratoconus terms best corrected and uncorrected visual acuity, average K topographic astigmatism. Settings design: Prospective interventional case series study Material methods: 28 eyes diagnosed were evaluated from August 2009 – July 2011 a tertiary eye care hospital. All underwent outcomes assessed on 4 parameters: Average Keratometric re...

INTRODUCTION Astigmatism is a visually disabling refractive error, and at least 15%-20% cataract patients have corneal astigmatism of ≥1.50 diopters (D). One way to correct astigmatism simultaneously during cataract surgery is to place limbal relaxing incisions (LRIs). It is possible, however, that late corneal biomechanics may play an unfavorable role in refractive outcomes over time. Toric in...

Thirty-one patients with optic nerve hypoplasia (ONH) or septo-optic dysplasia and two patients with segmental ONH underwent retinoscopy. The results were compared with those of 20 normal subjects. There was a higher prevalence of astigmatism in the patients than in the controls. Two patients with segmental ONH had no evidence of astigmatism. The association of astigmatism with ONH has not hith...

Considering the rising number of MyoRing implantation procedures in keratoconic corneas and the refractive outcomes associated with this treatment modality, this study aimed to evaluate and compare the magnitude and axis orientation of total and corneal astigmatism between before and after MyoRing implantation in 34 eyes of 28 patients with keratoconus (KCN) (mean age: 29.41 ± 7.0 years). The i...

purpose: to report the outcomes of graft refractive surgery (grs) together with clear-cornea phacoemulsification and intraocular lens (iol) implantation in post-penetrating keratoplasty (pkp) eyes. methods: fourteen eyes of 13 patients who had received pkp underwent simultaneous grs (relaxing incisions with or without counter-quadrant compression sutures) and clear-cornea phacoemulsification wi...