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Exploring the Divergence Range for Stereopsis Maintenance With a Computer-Simulated Troposcope in Patients With Intermittent Exotropia.
Huang, Chu-Hsuan; Wang, Ai-Hou; Hu, Fung-Rong; Tsai, Tzu-Hsun.
Affiliation
  • Huang CH; Department of Ophthalmology National Taiwan University Hospital, Taipei, Taiwan.
  • Wang AH; Department of Ophthalmology, National Taiwan University College of Medicine, Taipei, Taiwan 3Department of Ophthalmology, Cathay General Hospital, Taipei, Taiwan.
  • Hu FR; Department of Ophthalmology National Taiwan University Hospital, Taipei, Taiwan 2Department of Ophthalmology, National Taiwan University College of Medicine, Taipei, Taiwan.
  • Tsai TH; Department of Ophthalmology National Taiwan University Hospital, Taipei, Taiwan 2Department of Ophthalmology, National Taiwan University College of Medicine, Taipei, Taiwan 4Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan.
Invest Ophthalmol Vis Sci ; 57(10): 4493-7, 2016 08 01.
Article in En | MEDLINE | ID: mdl-27571016
PURPOSE: To investigate whether sensory input or motor signal of the extraocular muscle is the main activator of suppression in human intermittent exotropia (X(T)). METHODS: A case-control study was performed. Ten subjects with X(T) and 10 control participants were enrolled. The divergence range between both eyes when binocular vision was maintained was measured by using stereotests with a self-written computer program mimicking a troposcope. The break point, defined as the deviation angle at which stereopsis broke during eye deviation, was compared between the experimental and control groups by using a t test. RESULTS: The median near deviation angle in the experimental group was 42.5 prism diopters (PD) (mean, 44.5 ± 10.82 PD). The mean break point was 40.45 ± 10.79 PD in the X(T) group and 26.86 ± 2.62 PD in the control group (P = 0.003). The mean ratio of the break point to the near deviation angle was 0.92 ± 0.23 in the X(T) group, with the ratio close to 1 in 7 of 10 subjects. CONCLUSIONS: Binocular vision can be maintained if similar images are projected onto corresponding retinas during the tropic phase of X(T). The antidiplopic mechanism in X(T) patients (i.e., suppression) is evoked by sensory input from binocular rivalry rather than by motor signal of the extraocular muscle.
Subject(s)

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Vision, Binocular / Visual Acuity / Exotropia / Diagnosis, Computer-Assisted / Depth Perception / Diagnostic Techniques, Ophthalmological / Oculomotor Muscles Type of study: Diagnostic_studies / Observational_studies Limits: Adult / Female / Humans / Male Language: En Journal: Invest Ophthalmol Vis Sci Year: 2016 Document type: Article Affiliation country: Taiwan Country of publication: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Main subject: Vision, Binocular / Visual Acuity / Exotropia / Diagnosis, Computer-Assisted / Depth Perception / Diagnostic Techniques, Ophthalmological / Oculomotor Muscles Type of study: Diagnostic_studies / Observational_studies Limits: Adult / Female / Humans / Male Language: En Journal: Invest Ophthalmol Vis Sci Year: 2016 Document type: Article Affiliation country: Taiwan Country of publication: United States