Photophobia, visual blurring, keratitic precipitates (best seen with a slit lamp) and irregularity of the pupil are all features of iritis. Severe pain suggests scleritis and is not typical of iritis or the milder condition of episcleritis, where the inflammation usually affects just a sector of the globe of the eye. In scleritis the pain often disturbs sleep, and can literally drive people to bang their head against the wall and ask for the eye to be removed.
Scleritis is often associated with systemic symptoms and a manifestation of vasculitis: check an MSU for blood / protein, full blood count, renal / liver / bone function, inflammatory markers and autoimmune / vasculitic serology (in particular rheumatoid factor and serum ANCA).
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