Definitions
            
                
        Visual acuity
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
 
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