It is common for people to have an STD
and have no genital symptoms, so they are quite tricky... Eye
problems with chlamydia are usually a slight redness, irritation, mild mucous, normal vision....usually only one eye. It often will occur, go away for a few weeks and then come back, go away, etc...It is surprisingly easy to transfer to your eye!
I'm not sure how it works in the UK, as I live in the USA.