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
A curtain-like loss of vision, severe sudden vision loss or severe eye pain needs emergency eye assessment.
If you cannot reach your eye service promptly, use the local emergency department or emergency eye clinic.
Do not drive yourself.
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 is bleeding heavily and it will not stop with firm pressure
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
Contact your eye team urgently the same day if you develop:
New flashes or a sudden increase in floaters
A shadow, curtain or missing area in your vision
Vision that suddenly becomes much worse
Increasing redness, swelling, discharge or pain
Persistent headache, nausea or vomiting after treatment
3
Does any of this apply?
Book an appointment
Mention symptoms that last longer than expected at your routine follow-up.
The article also says
Mild grittiness, temporary blur and light sensitivity usually improve as the drops wear off.
Every sign above is quoted from the sofidex article on Laser photocoagulation - eye. If you are not sure, err upward — it is always reasonable to be checked.