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
Call emergency services or attend an emergency department for sudden complete vision loss, a serious eye injury, or severe eye pain with rapidly worsening sight.
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
Seek urgent same-day eye care for:
Sudden flashes with many new floaters
A curtain or shadow moving across your vision
A rapid drop in vision
A painful, red eye, especially with nausea or headache
3
Does any of this apply?
Book an appointment
Arrange a routine eye examination if you notice a persistent change in vision, a new or changing dark mark on the eye, or a change in the shape of the pupil.
These symptoms often have causes other than melanoma, but they should be assessed.
If you have already been treated, contact your eye or cancer team about new vision changes, increasing redness or discomfort, treatment side effects, or symptoms that continue between planned appointments.
Keep routine follow-up visits even when you feel well.
Every sign above is quoted from the sofidex article on Melanoma of the eye. If you are not sure, err upward — it is always reasonable to be checked.