I am pretty sure that what looks as though it could be UO is actually LIO, meaning lente intraocular. CP is cámara posterior. And AO, as noted in an earlier question, is ambos ojos.

This patient has had an operation for cataract.

http://en.wikipedia.org/wiki/Intraocular_lens
http://es.wikipedia.org/wiki/Lente_intraocular

https://www.google.es/search?num=100&q="posterior chamber in...

http://en.wikipedia.org/wiki/Posterior_chamber_of_eyeball

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Note added at 32 mins (2014-08-09 19:50:09 GMT)
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In English the abbreviation PC IOL can be used for this:
http://bjo.bmj.com/content/88/6/734.full

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Note added at 1 day1 hr (2014-08-10 20:47:42 GMT)
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In fact an English-speaking ophthalmologist would express this as PCIOL OU (the OU standing for oculus utrique: both eyes). If you search for this string you'll find examples (most often with PCIOL run together). Ophthalmologists really like their abbreviations. Here's the list I posted on another of your questions:
http://www.aao.org/yo/newsletter/2013-print/article02.cfm

And a lot more here:
http://www.ophthobook.com/extras/eyeabbreviations

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Note added at 1 day1 hr (2014-08-10 20:49:34 GMT)
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Pardon me: oculus uterque, not utrique.