Amblyopia is considered to be a permanent reduction in vision that arises from abnormal visual experience early in life, affecting 2-3% of the general population. The primary treatment for amblyopia in children, for the last 250 years has consisted of patching the fellow eye. Patching is considered to be ineffective in adults and is seldom, if ever used. Our main aim is to develop new interventions that embed visual training in active and rewarding visuomotor tasks for restoring both visual acuity and stereopsis in adults and children with amblyopia and to compare it to the traditional treatment of patching. The first such intervention is action videogame playing. This activity enhances aspects of vision in young healthy eyes that are known to be deficient in amblyopic eyes. We ask whether action video game playing may be useful in restoring visual functions in amblyopic eyes. Specifically we will develop and test a customized videogame which enables the presentation of """"""""designer"""""""" targets. An important goal is to promote coordination between the two eyes, therefore we will develop a new interface that uses filtering to degrade the image being sent to the fellow eye in order to match the level of the amblyopic eye. Training will therefore require patients to play an action video game with roughly balanced binocular input. While action games appear most effective in enhancing vision in young adults with normal vision, these games are not appropriate for pediatric populations, thus we also propose to develop and test a videogame that is """"""""child friendly"""""""" using the same principles. The second intervention, focused directly on retraining stereopsis, is visually guided hand movements in a virtual-reality environment in which we can manipulate different cues to depth and in which patients receive implicit performance feedback embedded in the task. We ask whether this virtual reality training, which capitalizes on our previous work on how monocular and stereo cues combine to support depth perception, may promote fusion and stereopsis. A strength of this joint proposal between UC Berkeley and U of Rochester is in our outcome measures. We will evaluate and quantify a broad range of visual functions including stereopsis in amblyopic subjects. Our pilot data suggests that improving visual acuity and stereopsis is an achievable goal even in adult patients. A commercially available video game has been adapted to the needs of this project in collaboration with game designers, and will be made freely available to eye clinics for a randomized clinical trial if the project is successful.

Public Health Relevance

Amblyopia is the most frequent cause of vision loss in infants and young children. The primary treatment for amblyopia in young children consists of patching the fellow eye, however, patching is considered to be ineffective in older children and adults. The relevance of this project is in developing new, effective interventions for restoring visual acuity and stereopsis in adults and children with amblyopia.

Agency
National Institute of Health (NIH)
Institute
National Eye Institute (NEI)
Type
Research Project (R01)
Project #
5R01EY020976-03
Application #
8282845
Study Section
Central Visual Processing Study Section (CVP)
Program Officer
Araj, Houmam H
Project Start
2010-09-01
Project End
2014-05-31
Budget Start
2012-06-01
Budget End
2014-05-31
Support Year
3
Fiscal Year
2012
Total Cost
$589,171
Indirect Cost
$111,585
Name
University of California Berkeley
Department
Type
Schools of Optometry/Ophthalmol
DUNS #
124726725
City
Berkeley
State
CA
Country
United States
Zip Code
94704
Zomet, Ativ; Polat, Uri; Levi, Dennis M (2016) Noise and the Perceptual Filling-in effect. Sci Rep 6:24938
Chopin, Adrien; Levi, Dennis; Knill, David et al. (2016) The absolute disparity anomaly and the mechanism of relative disparities. J Vis 16:2
Ding, Jian; Levi, Dennis M (2016) Binocular contrast discrimination needs monocular multiplicative noise. J Vis 16:12
Chung, Susana T L; Kumar, Girish; Li, Roger W et al. (2015) Characteristics of fixational eye movements in amblyopia: Limitations on fixation stability and acuity? Vision Res 114:87-99
Vedamurthy, Indu; Nahum, Mor; Bavelier, Daphne et al. (2015) Mechanisms of recovery of visual function in adult amblyopia through a tailored action video game. Sci Rep 5:8482
Levi, Dennis M; Knill, David C; Bavelier, Daphne (2015) Stereopsis and amblyopia: A mini-review. Vision Res 114:17-30
Vedamurthy, Indu; Nahum, Mor; Huang, Samuel J et al. (2015) A dichoptic custom-made action video game as a treatment for adult amblyopia. Vision Res 114:173-87
Li, Roger W; Ngo, Charlie V; Levi, Dennis M (2015) Relieving the attentional blink in the amblyopic brain with video games. Sci Rep 5:8483
Zhang, Jun-Yun; Cong, Lin-Juan; Klein, Stanley A et al. (2014) Perceptual learning improves adult amblyopic vision through rule-based cognitive compensation. Invest Ophthalmol Vis Sci 55:2020-30
Wang, Rui; Zhang, Jun-Yun; Klein, Stanley A et al. (2014) Vernier perceptual learning transfers to completely untrained retinal locations after double training: a ""piggybacking"" effect. J Vis 14:12

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