Fig. 2. Visual blind board installation example. (A) If a child laterally flexes his head over 90 degrees, he can’t see the smart device. (B) If the child laterally flexes his head about 30 degrees, he can see only a part of the smart device. (C) If the child straightens his head, he can see the whole of the smart device.

J Korean Soc Phys Med 2022;17:31-40 https://doi.org/10.13066/kspm.2022.17.3.31

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