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Thursday, July 23, 2009
❝Gonioscopy Prac❞
it's been a really long time it seems since i last blogged. i think mainly because it's my reluctance to go through the hassle of plugging in my LG handphone to import the pics into the LG software installed into my laggy laptop. and also becos i have no confidence in my literary skills and decided it's better i distract you guys with the pics instead. grumble grumble... ok that's all side track.

anyways if that's the excuse for not blogging, i've run out of it. cos the pics you're going to see are exported directly from the lab com that's attached to the slit-lamp directly. this should help you guys see the structures better.

anyway gonioscopy is a way of assessing the anterior chamber depth quantitatively as you can see exactly the different structures as far as the AC depth allows us to see. some crash course for beginners: the more the structures of the eyes seen, the more open the angle it is, and therefore better. which mean liquid which is constantly being replenished in the eye can be diffused exteriorly, maintaining a balanced intraocular pressure.

but the lesser structures we can see, the worst it is. means the angle (ie the drainage system) is closed. that sucks. means you're refilling water into a balloon non-stop and the pressure just keeps going up. the pressure has no where else to go and so it just has to push backwards on the back of the eye: optic nerve head. which basically is the cause of acute angle closure glaucoma.

the pics below are some of those i had taken on peiyik's eyes. of course, 0.5% of proparacaine has to be instilled first before all these torture can take place.

using a 2-mirror gonio lens, the image on the right is in fact a mirror image on the left part of the eye. means if this is the left eye, then i'm actually looking at the nasal part. we are only interested in the 1st white band from the left of the pic. but if we look close enough at the white band, from the left, we can see a hint of greyish band which shows the ciliary body. this is followed by a really ambiguous streak of brighter white line which counts for the scleral spur. the adjacent brown, pigemented region which is the trabecular meshwork. and the white part is the scwhalbe's line. if you see the ciliary body, it means you've got great angle of grade 4. if you see only the scwalbe's line or nth at all, you're in grace danger, my apprentice.


another shot of the same thing, same place


reflected part of the superior angle


inferior


temporal


*bear in mind that these pics are on the left eye.


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Hello my name is jonathan chen. glad being able to start (yes...again) another blog after previous failures... pls read this blog with your own discretion. hope the cynical ones will take them with a pinch of salt and the gullible ones just believe them.
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