scholarly journals Improving the sensitivity of the OKP visual field screening test with a blue stimulus on a dark background

Eye ◽  
1996 ◽  
Vol 10 (5) ◽  
pp. 620-625 ◽  
Author(s):  
Izak F Wessels ◽  
Ruvdeep S Randhawa
Keyword(s):  
Visual Field ◽  
Screening Test ◽  
Field Screening ◽  
Dark Background

scholarly journals Visual Defects Associated with Vigabatrin: A Study of Epileptic Argentine Patients

2005 ◽  
Vol 32 (4) ◽  
pp. 459-464 ◽  
Author(s):  
María Cecilia Moreno ◽  
Brenda Giagante ◽  
Patricia Saidon ◽  
Silvia Kochen ◽  
Jorge Benozzi ◽  
...  
Keyword(s):  
Visual Field ◽  
Antiepileptic Drug ◽  
Screening Test ◽  
Screening Strategy ◽  
Visual Field Defects ◽  
Automated Perimetry ◽  
Field Screening ◽  
Full Field ◽  
Visual Defects ◽  
Field Defects

ABSTRACT:Objective:The aim of the present study was to assess visual alterations in a population of Argentine patients treated with the antiepileptic drug vigabatrin.Methods:Twenty patients receiving vigabatrin and 15 patients receiving carbamazepine were examined with automated perimetry using a Humphrey 120-point full screening strategy. In addition, scotopic flash electroretinograms were performed.Results:Of 20 patients treated with vigabatrin, two were unable to cooperate with testing. Of the remaining 18 patients, all but two showed at least one non-detected point inside the central 40° of the visual field of each eye. Of the 15 carbamazepine-treated patients, three were unable to perform the study. None of the remaining 12 patients showed visual field defects. Both a- and b-wave amplitudes of the scotopic electroretinogram were significantly reduced in 12 patients receiving vigabatrin.Conclusions:Visual field defects among patients on vigabatrin therapy may occur with a higher frequency than previously recognized. The Humphrey 120-points full field screening test and electroretinography are useful tools to assess the visual dysfunction associated with vigabatrin.

scholarly journals A comparison of the OKP visual field screening test with the Humphrey field analyser

Eye ◽  
1992 ◽  
Vol 6 (5) ◽  
pp. 521-524 ◽  
Author(s):  
Stephen A Vernon ◽  
Harry A Quigley
Keyword(s):  
Visual Field ◽  
Screening Test ◽  
Field Screening ◽  
Field Analyser

Fastpac visual field screening

1995 ◽  
Vol 2 (3) ◽  
pp. 117-121 ◽  
Author(s):  
Ivan M. Young ◽  
Julian L. Rait ◽  
Cathy A. Carson ◽  
Hugh R. Taylor
Keyword(s):  
Visual Field ◽  
Field Screening

scholarly journals What causes edge fixation in walking flies?

1990 ◽  
Vol 149 (1) ◽  
pp. 281-292 ◽  
Author(s):  
D. Osorio ◽  
M. V. Srinivasan ◽  
R. B. Pinter
Keyword(s):  
Visual Field ◽  
Lateral Inhibition ◽  
Lucilia Cuprina ◽  
Dark Side ◽  
Dark Line ◽  
Dark Region ◽  
Dark Background ◽  
Mach Band ◽  
Eye Region

The orientation of freely walking flies (female Lucilia cuprina) to lines and stripes in a circular arena is described. The following observations were made. 1. The flies walked straight towards a dark line using the frontal eye region, but a pale line on a dark background was only weakly attractive. 2. In bright conditions flies walked in a curved line towards a black-white edge, the path being convex towards the dark side of the border. The curves indicated that the flies were heading for a point about 5–10 degrees to the dark side of the edge. 3. In dim conditions the edge of a dark region was not especially attractive and flies headed towards any point in the dark area. These observations can be accounted for by assuming that the fly walks towards the darkest region in its visual field (scototaxis). In bright conditions the edges of a dark region become more attractive than its centre. This change could be explained if lateral inhibition creates a ‘Mach-band’ effect, making the edges appear darker than the centre. Thus, fixation behaviour in walking Lucilia females seems to be a simple taxis.

Sign in / Sign up

Export Citation Format

Share Document