Symptoms that need urgent assessment
Seek urgent care for sudden vision loss, a new field defect, severe pain, a red painful eye with nausea, chemical injury, penetrating injury or painful vision loss with contact lenses.
New double vision, drooping eyelid, unequal pupils or vision symptoms with weakness or speech difficulty may signal a neurological emergency.
What to do immediately
For chemical exposure, begin continuous rinsing with clean running water and continue while arranging care. Do not delay irrigation for a special solution.
Do not rub an injured eye, remove an embedded object, apply pressure to a possible open injury or use someone else’s drops.
Information that helps
Note when symptoms began, whether onset was sudden, associated pain or flashes, medicines and recent surgery or trauma. Bring reports if readily available, but never delay urgent care for paperwork.
Flashes, floaters and a curtain in vision
A few longstanding floaters are common, but a sudden shower of spots, new flashes or a shadow moving across vision may indicate a retinal tear or detachment. The eye can look normal from outside and may not hurt. A dilated retinal examination is time-sensitive, particularly after trauma, eye surgery or in a highly myopic eye.
Sudden painless loss can also result from retinal blood-vessel blockage or optic-nerve disease. Record the exact time the person was last known to see normally because some systemic stroke pathways and eye treatments depend on timing. Do not drive yourself if vision is suddenly impaired.
Redness, injury and chemical exposure
A red eye becomes urgent when accompanied by pain, reduced vision, marked light sensitivity, nausea, a cloudy cornea or recent surgery. Contact-lens wear increases concern for corneal infection. Remove the lens if it comes out easily, keep it and its case for the clinician, and do not patch the eye or begin leftover steroid drops.
For chemical splashes, immediate prolonged irrigation takes priority over searching for a clinic or identifying the product. After rinsing begins, arrange emergency assessment and bring the container or a photograph of its label if safe. For penetrating injury, shield without pressure and do not eat or drink until the emergency team advises.
Why telephone reassurance is not enough
Many urgent eye conditions share ordinary words such as blur, redness or floaters. Diagnosis may require vision measurement, pupil testing, pressure, slit-lamp examination and a dilated retinal view. A photograph cannot reliably exclude a corneal ulcer, pressure crisis or retinal tear. When warning signs are present, the safest question is where to obtain examination now—not which drop to try overnight.
Questions patients commonly ask
Is sudden blurred vision always an emergency?+
Sudden unexplained blur, a missing area of vision or vision loss with neurological symptoms needs urgent assessment. Gradual blur is less often emergent but still warrants examination.
What should I do after a chemical enters the eye?+
Start continuous rinsing immediately with clean running water and seek emergency care. Do not delay irrigation while looking for a special solution.
Can I use an old eye drop for a painful red eye?+
No. Old drops may be contaminated or inappropriate, and steroid drops can worsen infection or raise pressure. Painful redness with vision change requires examination.
Clinical references
This guide is informed by patient guidance from established public-health and professional medical bodies.