Stimulus type vs. convergence measures

The aim of this study was to investigate if near point of convergence (NPC) would improve when a fixation target with centrally placed 3-D features (to increase binocular disparity stimulus) was used in comparison to a target using only centrally...

Driving with the use of spectacle mounted telescopes (bioptics)

The authors discuss the current perspectives of spectacle mounted telescopes (bioptics) whilst driving among patients with visual impairment. The history, design and driving laws surrounding the use of bioptics is discussed in detail. In 1977, William Feinbloom developed a bioptic...

Three methods of suppression measurement

Test-retest reliability and interchangeability are evaluated for three filter bars available to measure density of suppression: Sbisa bar, Bagolini filter (BF) bar and neutral density filter (NDF) bar. The study involved 10 strabismic adults. Testing conditions were altered and effects...

Iranian prevalence of convergence / accommodative disorders

The aim of this study was to investigate the frequency of accommodative and convergence disorders in an optometric clinical population and ascertain tests with the highest sensitivity and specificity in detecting these anomalies. The authors gathered information on symptoms, near...

The rarebit vision test for macular conditions

Rarebit testing is used to measure low degrees of neuro-visual damage and is available for free on the internet. It consists of a fixed bright light dot presented on a black background. During testing it is presented briefly at different...

Dyslexic reading improved by vergence training

The aim of this study was to evaluate if reading performance could be improved by a period of compensatory vergence training in dyslexic children with otherwise normal binocular vision. The study included 13 children with dyslexia – mean age of...

Effect of oxygen levels on binocular summation of dark vision

Previous studies have reported conflicting results on the existence of binocular enhancement of dark vision. This study compares monocular and binocular absolute thresholds of dark adaptation in two different populations (healthy individuals and those with chronic respiratory insufficiency). The study...

Reliability of kinetic perimetry in children and young adults

This study reports on normative visual field area, feasibility and repeatability of testing for a large sample size of healthy children and young adults, using Octopus semi-automated kinetic perimetry. Sample included 221 healthy volunteers aged 5-22 years. The study was...

Reported cases of hemifield slide phenomenon

This article reports three cases of hemifield slide, a phenomenon whereby there is an inability to stabilise and fuse visual hemifields. It occurs with heteronymous visual field loss and is thought to result from the loss of corresponding retinal points....

Use of technology in low vision rehabilitation

This article is a review of the accessibility features available on tablets and smartphones for the visually impaired. It explains exactly what the accessibility features are, how to access them and how to use them as well as some useful...

Screening for stroke-related visual problems

The aim was to report the initial development and evaluation of a suitable screening tool for detecting visual problems after stroke. The tool has four components. The first three include questions asked by examiners about patients’ ocular history and symptoms,...

Visual defects in deaf children and young adults

This literature review article serves as a great update on the current evidence relating to visual defects in the young deaf population. There is a good introduction with background information and demographic data relating to UK hearing impairment. The authors...