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Post Info TOPIC: ocular Response Analizer


Executive

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Posts: 437
Date: Tue May 16 7:43 AM, 2006
ocular Response Analizer
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Hiere is a new devise wiith possible aplications on KC early dedction and which certainly will provide more info on our desease.

http://www.ocularresponseanalyzer.com/

KC cornea is more soft than a normal one, less elastic, more mould, etc...Presumably because of the lack of crosslinks. So he devise measures in vivo such biomechanical properties of the cornea.

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yarsky


Phase Two

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Date: Wed May 17 1:58 AM, 2006
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Yarsky... thats a pressure testing machine... is it not... it works the same as any eye pressure tester ... i think... maybe a latest model though...

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Executive

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Date: Wed May 17 3:53 PM, 2006
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Not exactely...The IOL is one thing. The corneal viscoelastic properties is another. The KC changes the viscoelastic properties (through the destruction of cross-links between the collagene fibers). And this machine detects the chages....


An extract: The Ocular Response Analyzer utilizes a rapid air impulse, and an advanced electro-optical system to record two applanation pressure measurements; one while the cornea is moving inward, and the other as the cornea returns. Due to its biomechanical properties, the cornea resists the dynamic air puff causing delays in the inward and outward applanation events, resulting in two different pressure values.The average of these two pressure values provides a repeatable, Goldmann-correlated IOP measurement (IOPG). The difference between these two pressure values is Corneal Hysteresis (CH); a new measurement of corneal tissue properties that is a result of viscous damping in the corneal tissue. The ability to measure this effect is the key to understanding the biomechanical properties of the cornea.The CH measurement also provides a basis for two additional new parameters: Corneal-Compensated Intraocular Pressure (IOPCC) and Corneal Resistance Factor (CRF). IOPCC is an Intraocular Pressure measurement that is less affected by corneal properties than other methods of tonometry, such as Goldmann (GAT). CRF appears to be an indicator of the overall resistance of the cornea



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yarsky


Phase Two

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Date: Thu May 18 2:58 AM, 2006
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This is the way pressure is read

Please Click Here

I think different thickness matters and the rubberness or plasticness of the cornea in determining eye pressure... although the readings can be assessed as being of high eye pressure or low if they are known too by some measure.

-- Edited by QuintriX at 02:59, 2006-05-18

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Executive

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Date: Thu May 18 11:53 AM, 2006
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Hi Quintrix,


imagine two identical plastic balls with the same liquid inside.


now change one ball's material from plastic to iron.


The pressure of the liquid inside the balls will be the same but the balls' material is different


the ORA machine measures the difference in ball materials.



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yarsky


Phase Two

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Date: Thu May 18 12:12 PM, 2006
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currently there is no way of measuring eye pressure with out the influance of the "material" effecting the readings.



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Executive

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Date: Thu May 18 2:55 PM, 2006
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yes, but that is the way to measure the viscosity/elasticity of the material without the influence of the inside pressure

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yarsky


Phase Two

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Date: Mon May 22 2:25 AM, 2006
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Click on this link and turn up the volume!... things are explained! by voice! ...and a slide show!


http://medcompare.fullviewmedia.com/asc/reichert/ocular_analyzer.html



-- Edited by QuintriX at 02:29, 2006-05-22

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