China, officially the People's Republic of China (PRC), is a sovereign state in East Asia.
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A Landolt C, also known as a Japanese Vision Test, Landolt ring or Landolt broken ring, is an optotype, i.e. a standardized symbol used for testing vision.
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The classical Latin alphabet, also known as the Roman alphabet, is a writing system that evolved from the visually similar Cumaean Greek version of the Greek alphabet.
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Ophthalmology is the branch of medicine that deals with the anatomy, physiology and diseases of the eye.
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A Snellen chart is an eye chart that can be used to measure visual acuity.
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Visual Acuity (VA) commonly refers to the clarity of vision.
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