Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Get emergency help immediately if:
A chemical has entered the eye; begin continuous rinsing first
An object is embedded in the eye or appears to have entered it
The injury involved high-speed metal, glass, or machinery
The eye looks misshapen, the pupil is irregular, or fluid is leaking
There is blood inside the eye or sudden major vision loss
A severe blow or sharp object caused the injury
And for anyone, someone who:
is bleeding heavily and it will not stop with firm pressure
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Seek urgent same-day assessment for pain, light sensitivity, or blurred vision after an injury.
This is especially important if you wear contact lenses, cannot open the eye, cannot rinse out a particle, or develop increasing redness, discharge, or worsening pain.
Arrange prompt reassessment if symptoms are not clearly improving within 24 to 48 hours, return after healing, or vision remains blurred.
The article also says
Do not remove an embedded object, press on the eye, or apply a tight dressing.
If possible, protect the eye with a rigid shield that does not touch it.
For a diagnosed uncomplicated abrasion, follow your review plan.
Every sign above is quoted from the sofidex article on Corneal injury. If you are not sure, err upward — it is always reasonable to be checked.