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
Seek urgent or emergency care for symptoms that are not typical of ordinary hyperopia, including:
Sudden loss or major reduction of vision
A painful red eye with blurred vision, halos, headache, or nausea
New flashes, many new floaters, or a curtain-like shadow
Eye injury or chemical exposure
Sudden double vision or a new drooping eyelid
These symptoms may signal a different eye or nervous-system problem and should not be explained away as a change in glasses.
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
An eye turn that appears suddenly needs prompt medical assessment, especially when it comes with double vision, weakness, severe headache, or other neurological symptoms.
A persistent eye turn in a child also deserves timely evaluation because visual development may be affected.
3
Does any of this apply?
Book an appointment
Arrange a routine eye examination if near work is repeatedly blurry or uncomfortable, headaches occur after visual tasks, or your current glasses no longer provide clear vision.
Children should be assessed if they squint, avoid close work, have difficulty reading, or show an eye turn.
The article also says
Farsightedness itself is not an emergency.
Every sign above is quoted from the sofidex article on Farsightedness. If you are not sure, err upward — it is always reasonable to be checked.