|
|
| Identifier |
000407825 |
| Title |
Οπτικοί χρόνοι αντίδρασης με ειδικούς φακούς επαφής |
| Alternative Title |
Visual reaction times with specific contact lenses |
|
Author
|
Πενταράκης, Κυριάκος
|
|
Thesis advisor
|
Πλαϊνης, Σωτήρης
|
|
Reviewer
|
Τσιλιμπάρης , Μιλτιάδης
Ian, Bailye
Δετορακής, Ευστάθιος
Σιγανός, Χαράλαμπος
|
| Abstract |
Purpose:
The evaluation of visual reaction times method to be used in tests for participation in special
οlympics.
Methodology:
In this study involved 9 subjects 5 healthy and 4 patients with optic nerve problem. The study focused on five healthy (3 males and 2 females) aged 24-39 with no previous ophthalmic problem, only a small refractive error which was corrected with the use of their glasses.
In healthy observers used specially made contact lenses (3 pairs) to impaired vision in various stages to record measurements in reaction times and vision evoked potentials.
The reaction times were measured for a stimulus (Gabor) which is circular with vertical gratings and edges deteriorates the contrast. Each measurement started with 100% contrast and gradually reduced until it reaches the threshold of the test.
In VEPs using two categories: Pattern Reversal Pattern Appearance and to compare the methods that the reaction times. In pattern Reversal used checkerboard stimulus with 20 and 10 arcmin for 100% contrast. In pattern Appearance used checkerboard stimulus 22 and 11arcmin for 80% contrast.
Results:
The results show for reaction times that as the slope of the reaction time increases with 1 / Contrast smaller sensitivity that is worse vision. For evoked potential that decreases as the vision both shifted to the right by the P100 and decreases the amplitude at the pattern Reversal and pattern Appearance.
Conclusions:
From the study we can conclude that the reaction times are as good visual evaluation method with several advantages over the vision evoked potentials. This follows from the statistical verification that we measured on our experience from the study. There was often difficult to take measurements of evoked potentials in low vision and especially in subjects with optic nerve disease in contrast to the visual reaction times we did it without much difficulty. Another advantage of the methods is the speed of these measurements are in contrast to the measurements of evoked potentials which last longer.
|
| Language |
Greek, English |
| Issue date |
2017-03-29 |
| Collection
|
School/Department--School of Medicine--Department of Medicine--Post-graduate theses
|
|
|
Type of Work--Post-graduate theses
|
| Views |
292 |
Οπτικοί χρόνοι αντίδρασης με ειδικούς φακούς επαφής
