acanthamoeba keratitis is a vision-threatening infection caused by pathogenic species of the genus acanthamoeba. in this study, 13 acanthamoeba keratitis cases were diagnosed among 52 keratitis patients. to confirm the identity of acanthamoeba at the genus level, a pcr-based method was used, and their pathogenic potential was determined using in vitro cytotoxicity assays on human corneal epithe...

purpose : acanthamoeba keratitis (ak) is a sight-threatening corneal infection with a rapidly increased incidence since 1990s along with the growing popularity of contact lenses. in this study we aimed to study patients with ak and its associated risk factors in farabi eye hospital of tehran, focusing on those with more severe corneal involvement. methods : patients with clinical or laboratory ...

purpose : to report clinical and pathological features of three cases of opacification with hydrophilic acrylic intraocular lenses (iols) case reports : in this interventional case report, we introduce the surgical and laboratory information about three hydrophilic acrylic iols which calcified after implantation for these patients with cataract. these lenses were explanted and analyzed with opt...

purpose : the objective of this study was to evaluate the outcome of acrysof toric intraocular lenses (iols) implantation in cataract surgery for the correction of regular corneal astigmatism. methods : twenty eyes of 16 patients with cataract and regular corneal astigmatism of 1.00-4.00 diopter (d) underwent surgery. depending on the amount of corneal astigmatism, an acrysof toric iol of type ...

purpose: to compare rose-k and conventional rgp contact lenses in terms of visual acuity, visual function and comfort in keratoconus patients. method: fifty-four patients with keratoconus were randomly fitted with rose-k and conventional rgp contact lens (wohlk contact lens), by one experienced ophthalmologist using a standard (three touch point) approach. general and demographic information, k...

Background: Awareness of the motives of the students for choosing to study medicine demonstrates their understanding of the nature of this major and their expectations from their future profession. The evaluation of the volume of students who choose this major with wrong motives is necessary for educational planning of professional commitment. This study was conducted to evaluate the motives of...

purpose: to determine the effect of using rigid gas permeable (rgp) contact lenses in improvement of involuntary eye movements and visual functions in hyperopic astigmatism patients with congenital nystagmus. methods: this prospective interventional case series study was conducted on patients with congenital nystagmus and hyperopia equal or more than +0.5 d and astigmatism more than -1 d, who w...

  Background: Increased oxygen free radical and reduced glutathione level in the eye lens are important risk factor for cataract formation. The antioxidative property and increasing cellular and extra cellular glutathione level have been reported by several herbal medicines including silymarin.  Objective: In present interventional study Silybum marianum L. seed extract (silymarin) was tested a...

A polymer-based flat microlens array is demonstrated. Within each pixel of the array, the polymer presents a circular central-symmetric inhomogeneous orientation. Pixel with such a structure behaves a lens-like character. A suitable amount of liquid crystal mixed in the polymer host can improve not only the lens flexibility but also the lens performance. Moreover, the polymer-based microlens ar...

Introduction: Critical organs and structures may receive significant amounts of irradiation even if they are not the target of radiotherapy or located outside the treatment field. Although the sensitive thyroid gland and lens are not directly the targets of treatment, they can be affected by irradiation during the treatment of tumours in head and neck region. The purpose of thi...