August 2016
Volume 16, Issue 12
Open Access
Vision Sciences Society Annual Meeting Abstract  |   September 2016
Dichoptic perceptual training in juvenile amblyopes with or without patching history
Author Affiliations
  • JunYun Zhang
    Department of Psychology and Peking-Tsinghua Center for Life Sciences, Peking University
  • XiangYun Liu
    Department of Ophthalmology, Tengzhou Central People's Hospital, Tengzhou, Shandong Province, China
  • Cong Yu
    Department of Psychology and Peking-Tsinghua Center for Life Sciences, Peking University
Journal of Vision September 2016, Vol.16, 30. doi:10.1167/16.12.30
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      JunYun Zhang, XiangYun Liu, Cong Yu; Dichoptic perceptual training in juvenile amblyopes with or without patching history. Journal of Vision 2016;16(12):30. doi: 10.1167/16.12.30.

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      © 2017 Association for Research in Vision and Ophthalmology.

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Abstract

Dichoptic training is becoming a popular tool in amblyopia treatment. Here we investigated the effects of dichoptic training on juvenile amblyopia no longer responsive to patching treatment (PT group) or never patch treated (NPT group). Training consisted of three stages. (1) 10 PT and 10 NPT amblyopes (8-17 years, 15-anisometropic, 3-ametropic, 1-strabismus, 1-mixed) received dichoptic de-masking training for 40 hours. They used AEs to practice contrast discrimination of Gabors that were dichoptically masked by a band-filtered noise pattern simultaneously presented in NAEs. Dichoptic learning is indexed by the increase of maximal tolerable noise contrast (TNC) for AE contrast discrimination. Training improved maximal TNC by 350% in PT and 480% in NPT, which translated to stereoacuity improvements by 4.6-lines in PT and 3.0-lines in NPT, and AE visual acuity improvements by 1.3-lines in PT and 2.1-lines in NPT. (2) The amblyopes further received stereopsis training for another 40 hours. Training improved stereoacuity by 2.4-lines in PT and 0.5-lines in NPT, and AE acuity by 0 line in PT and 0.5 lines in NPT. Seven PT amblyopes regained normal stereoacuity (20~50 arcsec) after two stages of training. (3) Extra monocular AE grating acuity training (30 hours) failed to improve grating acuity in both groups. Neither did it produce further AE acuity and stereoacuity gains. After training the visual acuity and stereoacuity gains persisted for at least one year. Dichoptic training improved vision in both PT and NPT juvenile amblyopes. The PT group with milder amblyopia benefited substantially more in stereoacuity (6.0-lines), probably because improved AE acuity (1.3-lines) could translate to greater balance of binocular vision and thus better stereoacuity. The NPT group benefited more in visual acuity (2.6-lines), consistent with our previous report (Liu et al., 2011). Our study confirmed the effectiveness of dichoptic training approaches in the treatment of juvenile amblyopia.

Meeting abstract presented at VSS 2016

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