Unusual pupil on one side

Wondering if someone has seen this before, the eye where the pupil is bigger her left, right hand side if looking at pic. We have seen a vet, there is no cancer or infection noted. It’s very unusual and pupil seems to pool at the bottom. It may be injury related as she was a stray or genetic? We adopted her a week ago but would appreciate any insight.

Hello!  Im interested in this line, 'We have seen a vet but there was no cancer or infection noted.'   In what circumstances was this vet consulted?  Does this mean, 'The vet had a good look at the eye and ruled out any cancer or infection' (and how would they have done this in a lesion fixed behind the cornea?  Did they biopsy it?  Did they write a report on the clinical notes?)  Or do they mean, 'a vet speyed the cat in a neuter clinic but they didnt mention the eye.'  There appears to be a significant abnormality here, with discolouration of the eye which may be a sign of uveal cysts or cancer eg melanoma (the two are notoriously difficult to tell apart).  Another possible differential is a developmental abnormality- caused as they eye was forming - or a reaction.  To my mind, if there is nothing in the notes, then the way to be sure would be to get someone to look at this in three dimensions and then to consult an opthalmologist.