Visual acuity

The ability to visually identify forms, letters and symbols at a standardized distance away.

When to seek immediate medical care

See a doctor immediately if:

  • Severe eye pain or irritation
  • Vision loss, double vision, eye floaters, flashes of light, or halos around lights
  • Severe headache, nausea, or vomiting
  • Numbness or weakness on one side of the body
  • Confusion, dizziness, or trouble talking

When to make a doctor's appointment

Make an appointment to see a doctor if:

  • Impaired ability to read or write comfortably, drive safely, or do everyday activities

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