Walking alone (without assistance) is considered by the World Health Organization as the terminal independent walking milestone, typically achieved by 18 months. Children born with severe visual im...

中文翻译：

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一项改善 5 岁及以下失明或低视力儿童独立行走结果的研究

世界卫生组织认为独自行走（没有帮助）是终末独立行走的里程碑，通常在 18 个月内实现。出生时有严重视力障碍的儿童...