Quantifying Suppression in Anisometropic Amblyopia With VTS4 (Vision Therapy System 4)
| Autor: | Shivalika Sehgal, PremNandhini Satgunam |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Adult medicine.medical_specialty Visual acuity genetic structures Adolescent Biomedical Engineering Visual Acuity VTS Positive correlation Amblyopia Vision therapy Article 03 medical and health sciences Young Adult 0302 clinical medicine Ophthalmology medicine Humans lazy eye Child vision therapy Depth Perception Vision Binocular Monocular business.industry Blind spot Stereo acuity suppression eye diseases Stereoscopic acuity 030104 developmental biology Stereopsis Cross-Sectional Studies 030221 ophthalmology & optometry sense organs medicine.symptom business |
| Zdroj: | Translational Vision Science & Technology |
| ISSN: | 2164-2591 |
| Popis: | Purpose Visual acuity (VA) of the amblyopic eye is usually considered for monitoring improvement with therapy. However, participation of the amblyopic eye under binocular viewing conditions is also important. This study investigated the use of a clinically available tool VTS4 (Vision Therapy System 4) to quantify the participation or suppression of the amblyopic eye under binocular viewing conditions. Methods A cross-sectional study on patients with anisometropic amblyopia was undertaken. Monocular VA was thresholded. Stereo acuity was measured with Randot stereo test. Simultaneous macular perception (SMP) targets in VTS4 were dichoptically presented. SMP target size was reduced till the amblyopic eye's target disappeared (suppression scotoma size). An average of three measurements was taken for the suppression scotoma size. Results Twenty-eight patients participated (aged 6 to 21 years). The mean interocular VA difference was 0.50 ± 0.27 logMAR. The mean scotoma size was 8.2° ± 5.4°. Mean stereo acuity was 2.06 ± 0.34 log arc seconds from 21 patients on whom stereopsis could be measured. Suppression scotoma size showed a significant (P < 0.001) positive correlation with both interocular VA difference (r = 0.59) and stereoacuity (r = 0.72). Conclusions Participation of the amblyopic eye under binocular viewing condition can be assessed by measuring the suppression scotoma size in VTS4, even when stereoacuity is poor or not measurable. Smaller the suppression scotoma, better is the amblyopic eye's participation. Translational Relevance VTS4 can be used in monitoring amblyopia therapy by quantifying suppression of the amblyopic eye. |
| Databáze: | OpenAIRE |
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