Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency eye care for sudden severe vision loss, a dark curtain across the vision, many new floaters or flashing lights, or severe eye pain.
Call emergency services for vision loss accompanied by facial drooping, arm weakness, difficulty speaking, severe dizziness, or a sudden severe headache.
These can be signs of a stroke or another neurological emergency.
Seek urgent assessment from an eye service if you notice:
These changes may indicate wet AMD and should not wait for a routine appointment.
After an eye injection, urgent warning signs include worsening pain, increasing redness, marked light sensitivity, or rapidly worsening vision.
Arrange a routine eye examination if reading is becoming harder, colours seem duller, or your central vision has gradually become less clear.
Also attend your planned monitoring visits if you already have AMD.
Every sign above is quoted from the sofidex article on Macular degeneration. If you are not sure, err upward — it is always reasonable to be checked.