– Corneal Hysteresis (CH) Measurement: The ORA measures CH, which assesses the biomechanical properties of the cornea. It provides valuable information on glaucoma risk and progression, going beyond corneal thickness or topography.
This improves the assessment of glaucoma risk and helps set appropriate treatment goals.
– Measurements: Corneal Hysteresis (CH), Corneal Compensated Intraocular Pressure (IOPcc), Corneal Resistance Factor (CRF)
– Corneal Conditions: CH and CRF measurements reflect changes in corneal biomechanics in conditions like keratoconus and post-refractive surgery
The electro-optical system continuously monitors the cornea’s curvature throughout this process, collecting 400 data samples in just 20 milliseconds.
The Ocular Response Analyzer provides comprehensive pressure and cornea information, including:
1. IOPcc (Corneal Compensated IOP): This new IOP measurement is less affected by corneal properties, providing a more accurate assessment of intraocular pressure.
2. CH (Corneal Hysteresis): CH is a measure of the viscous damping in the cornea.
3. CRF (Corneal Resistance Factor): CRF represents the total viscoelastic response of the cornea, providing additional insights into its biomechanical properties.
4. IOPg (Goldmann Correlated IOP): IOPg is the traditional IOP measurement that can be used for historical reference.
Ocular Response Analyzer takes corneal biomechanical properties into consideration, providing Corneal Compensated IOP (IOPcc). The patented bi-directional applanation system enables the measurement of Corneal Hysteresis and IOPcc.
Intraocular pressure (IOP) is the only modifiable risk factor for glaucoma. As such, accurate measurement of IOP is critical for proper diagnosis and management. However, it is widely recognized that Goldmann and other tonometers are influenced by corneal properties. While corneal thickness has been accepted as an important factor contributing to the accuracy of IOP measurements, it has been shown that attempting to adjust IOP values by means of a corneal thickness correction formula does not add any value to the glaucoma decision making process. It is biomechanics, not thickness, that predominantly influence the accuracy of IOP measurements.
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