Search results for "Heterophoria"
showing 5 items of 5 documents
Binocular Vision in Patients with Multiple Sclerosis.
2021
Amparo Gil-Casas,1,2 David P Piñero-Llorens,2 Ainhoa Molina-Martin2 1Clínica Optométrica, Fundació Lluís Alcanyís, University of Valencia, Valencia, Spain; 2Optics and Visual Perception Group (GOPV), Department of Optics, Pharmacology, and Anatomy, University of Alicante, Alicante, SpainCorrespondence: Ainhoa Molina-MartinDepartment of Optics, Pharmacology, and Anatomy, University of Alicante, Carretera San Vicente del Raspeig, San Vicente del Raspeig, 03690, Alicante, SpainTel +34 965 903-400Email ainhoa.molina@ua.esPurpose: Oculomotor disorders have been reported in multiple sclerosis (MS) in up to 80% of cases. There have …
Heteroforiju izmaiņas pēc ilgstošas disociācijas un prizmu adaptācijs testa
2021
Maģistra darbs ir uzrakstīts angļu valodā uz 46 lapām. Tas satur 14 attēlus, 8 tabulas un 80 atsauces uz literatūras avotiem. Mērķis bija izvērtēt verģences adaptācijas ietekmi uz heteroforiju novērtējumu un prizmu adaptācijas testa pielietojumu klīniskajā praksē. Pirmajā daļā 40 dalībniekiem tika novērtētas heteroforija izmaiņas 2 minūšu laikā pēc disociācijas. Otrajā daļā tika novērtēta verģences adaptācija, izmantojot prizmu adaptācijas testu. Rezultāti parādīja, ka heteroforijas lielumu būtiski ietekmē disociācijas ilgums. Dalībniekiem ar diagnosticētu verģences anomāliju novēroja samazinātu verģences adaptāciju. Secinājums: verģences adaptācijai ir nozīmīga ietekme uz heteroforijas nov…
Monocular Versus Binocular Calibrations in Evaluating Fixation Disparity With a Video-Based Eye-Tracker
2015
When measuring fixation disparity (an oculomotor vergence error), the question arises as to whether a monocular or binocular calibration is more precise and physiologically more appropriate. In monocular calibrations, a single eye fixates on a calibration target that is taken as having been projected onto the center of the fovea; the corresponding vergence state represents the heterophoria (the resting vergence position), which has no effect on the calibration procedure. In binocular calibrations, a vergence error may be present and may affect the subsequent measurement of the fixation disparity during binocular recordings. This study includes a test of the precision of both monocular and …
Smartphone viewing distance during active or passive tasks and relation to heterophoria
2019
Our aim was to analyze viewing distance for smartphone users (aged 18-45 y.) in terms of passive or active task, relation to heterophoria, type of refractive error and smartphone font size. Participants were asked to read out loud text message (passive task) and afterwards rewrite the same text and send back (active task). For the text message we used sentence consisting of 23 words and 200 characters (with spaces). Participants used their own smartphones (font size monitored). For both passive and active task we measured task time and viewing distance at the end of the task. We found significantly shorter viewing distance for digital active task compared to passive task (29.3 ± 4.7 and 32.…
<title>Selective filters for improvement of color discrimination</title>
2003
Colored filters have been used as possible aids for perception in case of congenital color vision abnormalities. Higher stimulation for L cones in one eye (red filter) and for M cones (green) in other eye acts as a simple method to interfere in human color vision processing. Influence on subjective and objective vision performances as binocular functions, fusion, stereopsis and color vision has been tested. Special colored glasses have been created, taking into account each subjects refraction for distance and tested for the 5 months adaption time. No negative influence on binocular functions, no changes of heterophoria and lowering in fusion ability and stereopsis have been stated due to u…