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gonio allows for _____ view of angle
direct
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contraindications of gonio
- hyphaema
- lacerated/perforated globe
- recent ocular surgery
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perform gonio with caution
- corneal/conj abrasion, inflammation or infection
- recurrent corneal erosion syndrome
- recent ocular trauma
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limitations of gonio
- needs experience
- positioning of lens
- px line of gaze
- pupil dia variations
- differences in grading schemes used
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alternate non invasive techniques to gonio
- gonio is gold standard
- ultrasonic biomic
- scheimflug imaging
- OCT
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aq hum
- secreted into post ch
- circulates via pupil into ant ch
- AH turnover ~2hrs
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6 layers seen in gonio
- schwalbes line
- TM
- canal of schlemm
- SS
- CB
- iris
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schwalbes line
- if pigmented = sampolesis line
- most ant structure
- termination of dece membr
- line becomes 'dusted' with age
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TM
- non pig = ANT
- pig = post
- effect greater with age + in inf
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schlemm canal
- typically NOT visible
- only seen if canal contains blood
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SS
- light coloured landmark - defined
- pt of attachment of CB to sclera (TM attaches ant, CB post)
- if not seen, angle closure!!
- if unusually wide, indicator for angle recession
- iris processes and peripheral ant synechiae may cover SS
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