Owl ophthalmology

RE: Owl ophthalmology

Richard Saunders — Thu, 16 Jul 2015 19:05:12 GMT

just a bit of pedantry here, but 20/20 vision is a term meaning that one can see, at 20 paces, a letter that an average human can see at 20 paces. ie average human vision. Diurnal raptors have visual acuity around the 20/5 to 20/2 level, im guessing an owl not to be as good as a diurnal raptor, but better than non raptors.

RE: Owl ophthalmology

Gillian Mostyn — Sun, 05 Jul 2015 19:27:59 GMT

Thanks grumpyoldman. The bird won't be released, so 20/20 eyesight not imperative this time.

RE: Owl ophthalmology

grumpyoldman — Sun, 05 Jul 2015 18:01:57 GMT

Birds pupil control is somatic not autonomic ,so it may be a good idea to check how it dark adapts compared to the other side before letting it go, if it cant hunt it will starve.

Re: Owl ophthalmology

Hannah Wynne Richards — Wed, 01 Jul 2015 16:45:43 GMT

Well done.

Wyne

Re: Owl ophthalmology

Gillian Mostyn — Wed, 01 Jul 2015 16:03:18 GMT

Phew...looking a bit better today. Area of opacity reduced and eye no longer as painful. As the area and density of the opacity has reduced, I can now see through it and am happy that there is definitely no lens luxation or uveitis. Bird still well in itself. Looks like it was the tiacil causing the deterioration. Doing better on fucithalmic.

I suspect is was originally a traumatic cause bit will continue to monitor...

Re: Owl ophthalmology

Gillian Mostyn — Mon, 29 Jun 2015 21:47:11 GMT

Thanks Marie. Other eye completely AOK so I also suspected trauma, will have another good look on Wednesday but I couldn't see any FB etc. Will also check the lens location and ask about pox.... although no problems have been reported.

Cheers.

Re: Owl ophthalmology

Marie Kubiak — Mon, 29 Jun 2015 20:31:07 GMT

Is it completely unilateral? Any evidence of lens luxation/trauma? If not clear on ophthalmic exam alone with the miosis then a quick scan may help identify lens changes if you have a high frequency probe.

Any birds in the rescue with pox lesions?

Everything fits with uveitis and so I would be worried about lens leakage or penetrating injury starting the process off and secondary glaucoma is a common sequel in raptors so worth reviewing IOP.

Marie

Re: Owl ophthalmology

Gareth C. — Mon, 29 Jun 2015 17:29:31 GMT

if you look behind the ear between the feathers you can get a good view of the back of the orbit to check for any trauma swelling etc. re miosis may well be reflex miosis from corneal pain.

Re: Owl ophthalmology

Gillian Mostyn — Mon, 29 Jun 2015 17:17:58 GMT

[quote user="Vikki Halliday"]

I'd be concerned about uveitis, purely because of the apparent miosis ( although this could be voluntary but couls also be pain related), corneal opacity and blepharospasm.

The Tiacil could be irritating the cornea, gentimycin is quite epithelo-toxic so I'd maybe stop this. Can you measure the IOP? It should be 10.8 +/-3.6 mm HG.

[/quote]

I do suspect the miosis is pain related .... Have started birdie on some analgesia today. Was also concerned about the tiacil....have already changed antibiosis drops. But if this is primarily an anterior uveitis..... cause...????

Re: Owl ophthalmology

Gillian Mostyn — Mon, 29 Jun 2015 17:14:41 GMT

[quote user="Gareth C."]Does it fully blink?[/quote]

Yes, no issues with that. It also has a normal tear film.... The light reflection on the surface of the eye looks awful in the photo but is actually good. Must admit didn't do an STT as looked very 'wet', but am seeing it again on Wednesday.

Re: Owl ophthalmology

Vikki Halliday LLB — Mon, 29 Jun 2015 17:06:39 GMT

I'd be concerned about uveitis, purely because of the apparent miosis ( although this could be voluntary but couls also be pain related), corneal opacity and blepharospasm.

The Tiacil could be irritating the cornea, gentimycin is quite epithelo-toxic so I'd maybe stop this. Can you measure the IOP? It should be 10.8 +/-3.6 mm HG.

I'd also measure STT with a strip cut in half lengthways.

Re: Owl ophthalmology

Gareth C. — Mon, 29 Jun 2015 16:34:58 GMT

Re: Owl ophthalmology

Gareth C. — Mon, 29 Jun 2015 16:26:37 GMT

Does it fully blink? The location of the ulcer may be indicative of exposure from lagophthalmus possibly. In dogs with KCS (and cushings) you often get calcium deposition in the cornea which is crystaline and causes pinpoint ulcers. try it on remend gel BID for exposure and make up some edta drops if it looks crystaline. could you do a stt? where are you based?