Reichert's Ocular Response Analyzer® (ORA G3) is the only tonometer that measures Corneal Hysteresis (CH), which is a superior predictor of glaucoma progression. Corneal Hysteresis is an indicatior of the biomechanical or visco-elastic properties of the cornea, differing from thickness or topography, which are geometrical attributes.
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In addition to Corneal Hysteresis measurement, the Ocular Response Analyzer is a precision tonometer, providing Corneal Compensated Intraocular Pressure (IOPcc), a better indication of the true pressure, proven to be less influenced by corneal properties than Goldmann or other methods of tonometry.
Reimbursement: Eective January 1, 2015, CPT® Code 92145 was published specifically for the Corneal Hysteresis measurement provided by the Ocular Response Analyzer (ORA G3).
Clinical Benefits: Low Corneal Hysteresis (CH) is independently predictive of progressive visual field loss. There is evidence showing that CH is a strong predictor of the magnitude of IOP reduction that can be expected when IOP lowering therapy is started. These facts make CH very relevant in diagnosis and management of glaucoma, including the critical area of setting treatment expectations. The Reichert ORA G3's ability to quantify the mechanical bending characteristics of the cornea, enables the device to provide a corneal compensated IOP measurement (IOPcc), that is less affected by corneal properties than Goldmann tonometry. IOPcc is not correlated with corneal parameters such as Central Corneal Thickness (CCT) and remains fairly stable after ablative refractive surgery procedures. IOPcc has been shown to be a better indicator of current status of visual field damage and is better correlated with optic nerve characteristics such as cup-to-disc ratio, APONs, notching, peripapillary atrophy, and disc hemorrhages. Corneal biomechanical properties are also very relevant to corneal specialists; especially those involved in refractive surgery and/or Keratoconus. Ocular Response Analyzer measurements have been shown to be useful in the detection of Keratoconus as an adjunct to topography.