Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services if sudden vision loss occurs with weakness, facial drooping, difficulty speaking, severe dizziness, or a sudden severe headache.
These can be signs of a neurological emergency rather than retinitis pigmentosa.
Get urgent same-day eye care for:
Arrange a routine eye appointment if you notice increasing difficulty seeing at night, slower adjustment to darkness, loss of side vision, or frequent collisions with objects.
These symptoms have several possible causes and need a proper eye assessment.
The article also says
If you already have retinitis pigmentosa, seek an earlier review for a noticeable change in central vision, new distortion, increasing glare, or difficulty with tasks that were previously manageable.
These changes may reflect a treatable complication rather than the expected gradual course.
Every sign above is quoted from the sofidex article on Retinitis pigmentosa. If you are not sure, err upward — it is always reasonable to be checked.