Institute of Psychology, Chinese Academy of Sciences developed augmented reality technology for the treatment of amblyopia
When the input signal to one eye is poor, the signal from the other eye in the brain becomes more dominant. An extreme case of this phenomenon is amblyopia. Amblyopia has a high incidence in the population, which accounts for about 3% of the total population. The traditional intervention method of treatment is to cover good eyes to force patients to use weak eyes in their lives.
The Baomin Research Group, Key Laboratory of Behavioral Science, Institute of Psychology, Chinese Academy of Sciences, in collaboration with Beijing Tongren Eye Hospital and the University of Minnesota, USA, developed a wearable Augmented Reality (AR) technology to enable patients to treat amblyopia and increase their daily activities. Plastic eye balance system. The research group stated that this system can be considered as a special AR technology in a broad sense. The difference from the common AR technology is that it does not superimpose objects (such as arrow tips, web pages) that are not present in the environment on the screen shot by the camera. (Window), but some of the visual properties of the original camera shooting picture after a special algorithm changes and then presented to the wearer, that is, the wearer sees the picture is a real world after some kind of change. Therefore, this system is also called a change reality system. The system will present the video of the complementary eyes of the two eyes in real time. When the wearer interacts with the surrounding environment in real time, he is forced to use the two eyes to watch the world.
The system overcomes some deficiencies of traditional laboratory training through AR technology. For example, the method electronically adjusts the visual input of the real environment through computer programs, so that visual adaptation training can be integrated into daily life. In this way, the patient does not need to spend time to the designated research institution for treatment, nor does it prevent them from viewing the real scene because of long-term viewing of specific experimental stimuli, thereby affecting learning, work, and life. The research team measured and tracked the rebalance effect of both eyes based on binocular competition tasks. The experimental results show that in the 3-hour daily, 5-day training period, normal adults with unbalanced eyes perceive that the ratio of the grating length from the strong eye to the weak eye gradually approaches; The proportion of perceived duration of the two eyes becomes closer as time goes by; this effect reaches a maximum in two months after the end of training and can still be observed in four months. The study group also used a similar training procedure for 18 patients with amblyopia. The patient had visual acuity improvement in amblyopic eyes with 1.5 lines (logMAR). In another group of subjects, the research team tested the effects of six different visual tasks except for binocular competition on the effects of adaptive training. It was found that this adaptive training significantly changed the performance of eye movement consistency, visual acuity, Ebbinghaus illusion and interocular phase integration tasks.
The study found that "in the two months after the training, the subjects lived in a normal visual environment, the eye dominance continued to become more balanced" phenomenon is the first report in the related research field, and it is also the first time that our country's scientists have established visual plasticity. Research results combined with AR technology development and application.
Related research results are published online on Psychological Science. The study was funded by the National Natural Science Foundation of China and the key deployment projects of the Chinese Academy of Sciences.
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