PURPOSE To evaluate whether a selected group of 9 children with history of congenital esotropia is capable of producing vergence eye responses to fusional disparity stimuli. METHODS Nine children with history of congenital esotropia and 5 age-matched children with normal binocular vision were examined. Using a full-field target, vergence responses to base out 3 prism diopters placed in front ...

purpose: to report the results of orthoptic training in two middle-aged patients according to current theories. case report: a 56-year-old female with decompensated exophoria and myopia and a 68-year-old male with decompensated esophoria and moderate hyperopia underwent vision therapy according to standard procedures for improving fusional vergences and ocular accommodation. sheard and percival...

PURPOSE To report orthoptic changes after photorefractive keratectomy (PRK). METHODS This interventional case series included 297 eyes of 150 patients scheduled for PRK. Complete ophthalmologic evaluations focusing on orthoptic examinations were performed before and 3 months after PRK. RESULTS Before PRK, 2 (1.3%) patients had esotropia which remained unchanged; 3 (2%) patients had far exot...

The purpose of the present study was to assess the occurrence of visual dysfunctions and associated symptoms in active duty warfighters during the subacute stage of blast-induced mild traumatic brain injury (mTBI). A comprehensive visual and oculomotor function evaluation was performed on 40 U.S. military personnel, 20 with blast-induced mTBI and 20 without. In addition, a comprehensive symptom...

We measured the ability to fuse dichoptic images of a horizontal line alone or in the presence of a textured background with different vertical disparity. Nonius-line measurements of vertical vergence were also obtained. Diplopia thresholds and vertical vergence gains were much higher in response to an isolated vertically disparate line than to one with a zero vertical-disparity background. The...

PURPOSE To compare base-in prism reading glasses with placebo reading glasses for the treatment of symptomatic convergence insufficiency (CI) in children aged 9 to <18 years. METHODS In a randomised clinical trial, 72 children aged 9 to <18 years with symptomatic CI were assigned to either base-in prism glasses or placebo reading glasses. Symptom level, measured with a quantitative symptom qu...

tern may possess fusional capacity that allows compensation for small perceived retinal size differences, but when the difference exceeds a certain level, the binocular system is unable to fuse these perceived image differences and may function as binocular inhibition resulting in a smaller binocular than monocular VER amplitude. Our results show that the binocular system may be able to compens...

Many studies have shown the benefits of augmented reality (AR) to improve manufacturing and control processes in industry. However, presentation AR content through optical see-through head-mounted displays may induce unnatural viewing conditions, which consequences on user’s visual system not been investigated yet. This study aimed at assessing whether using instructions guide a manual task, i....