15:00 21/03/2026
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Nguồn tham khảo
  1. World Health Organization: WHO. (2026, February 10). Blindness and vision impairment. https://www.who.int/news-room/fact-sheets/detail/blindness-and-visual-impairment
  2. Professional, C. C. M. (2026, March 12). Visual Acuity Test (Snellen Eye Test Chart). Cleveland Clinic. https://my.clevelandclinic.org/health/diagnostics/24421-visual-acuity-test
  3. Daiber, H. F., & Gnugnoli, D. M. (2023, May 29). Visual acuity. StatPearls – NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK563298/
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