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Ophthalmology-related (adult/child)

Problems related to the "eyes"

Suddenly unable to see clearly (vision is blurry or hazy/vision is poor) or Suddenly, part of the field of vision became obstructed as if a curtain were lowered (tunnel vision)
Suddenly began to see double
Sudden severe eye pain (Pain so bad that it is not possible to perform other actions or move)
None of the above are applicable.