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BACKGROUND To evaluate long-term contrast sensitivity (CS) and visual acuity following implantation of monofocal, accommodating, refractive and diffractive multifocal intraocular lenses (IOLs) in patients with unilateral cataract. METHODS In this prospective non-randomized clinical trial, 87 patients with unilateral cataract were enrolled in four groups(More)
PURPOSE To compare the visual performance of patients with unilateral cataract following implantation of monofocal, accommodating, refractive, and diffractive multifocal intraocular lenses (IOL). DESIGN Prospective nonrandomized clinical trial. METHODS Eighty-seven patients with unilateral cataract were enrolled in 4 groups for phacoemulsification and(More)
We introduce certain linear positive operators and study some approximation properties of these operators in the space of functions, continuous on a compact set, of two variables. We also find the order of this approximation by using modulus of continuity. Moreover we define an rth order generalization of these operators and observe its approximation(More)
In the present paper, we study a Kantorovich type generalization of Meyer-König and Zeller type operators via generating functions. Using Korovkin type theorem we first give approximation properties of these operators defined on the space C [0, A] , 0 < A < 1. Secondly, we compute the rate of convergence of these operators by means of the modulus of(More)
PURPOSE The purpose of this study was to document the prevalence of anisometropia, anisoastigmatism, and anisometropic amblyopia in patients with neurofibromatosis-1 (NF1) and to compare it with that in age- and sex-matched controls. METHODS Fifty patients with NF1 and 150 age- and sex-matched controls were examined in this study. Cycloplegic(More)
In this paper, we present a sequence of linear positive bivariate operators and investigate the approximation properties of them. Next we study the rates of converge of this approximation by means modulus of continuity and functions from Lipschitz class. After we give a Voronovskaya type theorem for n Morever, we give an r th order generalization of these(More)
BACKGROUND The purpose of this study was to evaluate the results of tarsoaponeurectomy in patients with unsuccessful results after repetitive surgery or who developed post-traumatic blepharoptosis. METHODS The files of 107 patients (136 eyes) on whom surgery was performed between January 2010 and December 2014 due to blepharoptosis were scanned(More)
PURPOSE To evaluate of functional and cosmetic effectiveness of lower eyelid sling technique with fascia lata graft in patients with lagophthalmos due to facial paralysis. MATERIAL AND METHOD Ten patients with a mean age of 55.1 ± 19.77 years who underwent lower eyelid sling surgery with a fascia lata graft between September 2011 and January 2014 were(More)
PURPOSE To compare the outcomes of external dacryocystorhinostomy (E-DCR) by using two different flap anastomosis patterns and skin incision types. METHODS This study included 79 patients (88 eyes) with lacrimal drainage system disorders who underwent E-DCR surgery. Fifty eyes of 44 patients (group A) underwent E-DCR by suturing anterior and posterior(More)
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