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 emergency help now if photophobia occurs with:
Sudden loss or major reduction of vision
A chemical splash, penetrating injury, or significant eye trauma
Severe headache with fever, stiff neck, confusion, fainting, or seizure
New weakness, trouble speaking, or loss of balance
Begin rinsing an eye immediately after a chemical splash while arranging emergency help.
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
Do not wait for the discomfort to increase.
Arrange same-day medical or eye care for a new painful red eye, cloudy or blurred vision, halos around lights, vomiting with eye pain, or marked sensitivity in one eye.
You also need prompt assessment if symptoms begin while wearing contact lenses or soon after eye surgery.
3
Does any of this apply?
Book an appointment
Book a routine appointment if the sensitivity keeps returning, lasts longer than expected, is getting worse, or limits work, driving, reading, or time outdoors.
Mention any new medicine and whether you also have headaches or vision changes.
Every sign above is quoted from the sofidex article on Photophobia. If you are not sure, err upward — it is always reasonable to be checked.