Post-graduate theses
Search command : Author="Μπριασούλης"
And Author="Γεώργιος"
Current Record: 768 of 1236
|
|
| Identifier |
000383260 |
| Title |
Διερεύνηση της μονο-όρασης με τη χρήση οπτικών χρόνων αντίδρασης |
| Alternative Title |
Investigation of monovision via reaction times |
|
Author
|
Παπαδάτου, Ελένη
|
|
Thesis advisor
|
Πλαϊνης, Σωτήρης
|
|
Reviewer
|
Παλλήκαρης, Ιωάννης
Murray, Jam
Τσιλιμπάρης, Μιλτιάδης
Κυμιωνής
|
| Abstract |
The evaluation of intermediate visual performance in Monovision using Simple Reaction
Times.
Methodology:
In the present study, the participants were 11 healthy adults (mean age: 29±6 years and mean
visual acuity: -0,23±0,07 logMAR) without any ophthalmopathological disorders or refractive
surgery background and without amblyopia or anisometropia.
To simulate Monovision, positive dioptric defocus was sed (from +0.50 D to +3.00 D, in 0.50
D steps), which was inserted in the dominant or the non– dominant eye, in addition to
refraction for best corrected vision. Additionally, recordings were repeated under binocular
viewing conditions. The stimulus used for reaction times recordings was a sinusoidal grating
[5]
with contrast 10%, spatial frequency of 4 c/deg and horizontal orientation. All recordings
were performed at 1m distance.
Reaction times were recorded for 1) a stimulus which was presented at the center of the visual
field (foveal vision), 2) by using pupil apertures (3 and 6mm) under cycloplegia, for the
stimulus’ presented in the periphery (up to 10deg). 3), and lastly. Visual acuity was also
measured with ETDRS charts.
Results:
Defocus, whether monocular or binocular, leads in all cases to an increase in the reaction
times although is more pronounced for the Binocular Defocus. No statistical significant
differences were found between the two Monovision conditions. Statistical differences
occurred between the two Monovision conditions and the Binocular Defocus (for defocus
levels ≥1.0D). Also, performance with Monovision was better with the 6mm compare to
3mm. In the case of eccentricity, statistical significant differences were found between
monovision conditions and binocular viewing with the effect being non- significant for 10deg
eccentricities.
Through quadratic equations obtained from Monovision and Binocular defocus conditions, it
was calculated the value of the binocular dioptric defocus where the values of Monovision
(reaction times, visual acuity) were corresponding (for defocus +1.00, +2.00, +3.00 D).
Lastly, the results from Reaction times/ Effective Contrast were combined with Visual
Acuity. Small changes in Visual Acuity lead to more abrupt changes in reaction times under
Monovision compare to Binocular defocus.
Conclusions:
The results demonstrate that an increase in the amount of monovision (ie the addition) leads
to an increase in reaction times, which is less pronounced compared to Binocular Defocus.
The faster reaction times for 6mm aperture may show that the luminance is a more important
factor for monovision compare to Depth of Focus (resulting from small apertures). Lastly,
Monovision seems to affect more the foveal vision than the periphery vision.
|
| Language |
Greek |
| Subject |
Monovision |
|
Reaction times |
|
Μονο-όραση |
|
Οπτικοί χρόνοι αντίδρασης |
| Issue date |
2014-04-10 |
| Collection
|
School/Department--School of Medicine--Department of Medicine--Post-graduate theses
|
|
|
Type of Work--Post-graduate theses
|
| Permanent Link |
https://elocus.lib.uoc.gr//dlib/4/e/b/metadata-dlib-1400237193-728609-2762.tkl
|
| Views |
191 |
Collections
