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When Yong Yong (pseudonym) navigates through the bustling exhibition hall, a soothing voice whisperers in his ear, guiding him past obstacles and pointing out objects in his path. Wearing a special pair of glasses, Yong Yong walks around on his own, overwhelmed by a newfound sense of freedom and independence – “as if I was not blind,” he said with a smile. Yong Yong, 30, was born with severe visual impairment. As his eyes can perceive only faint...