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Product Overview

Reichert Ocular Response Analyzer® G3

Make a more confident glaucoma risk assessment with Corneal Hysteresis – a more objective predictor of glaucoma progression


Ocular Response Analyzer® (ORA) is the only device that measures Corneal Hysteresis (CH), a superior predictor of glaucoma progression. Corneal Hysteresis is an indication of the biomechanical properties of the cornea differing from thickness or topography, which are geometrical attributes.

In addition to Corneal Hysteresis, Ocular Response Analyzer provides 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.


Ocular Response Analyzer is made in the USA.

Corneal Hysteresis (CH): An indispensable tool in the glaucoma decision making process.

Corneal Hysteresis has consistently shown to be predictive of, or strongly associated with, glaucoma progression, and more powerfully so, than key indicators such as IOP and CCT, making it an indispensable tool in the glaucoma decision making process.

Glaucoma is the second leading cause of irreversible blindness in the world. Despite the fact that there are a variety of well-known risk factors, it can be difficult to diagnose. Beyond diagnosing, predicting an individual patient’s rate of future glaucoma progression is often extremely challenging for clinicians.

The Ocular Hypertension Treatment Study (OHTS), and similar studies, have brought to light the relevance of central corneal thickness (CCT) in glaucoma. Numerous studies utilizing the Ocular Response Analyzer have confirmed the importance of the cornea in glaucoma decision making and, in fact, demonstrated that Corneal Hysteresis is of far greater significance than CCT.


Corneal Compensated IOP (IOPcc): Less affected by corneal properties. 

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.


Corneal biomechanical properties can affect the accuracy of measured IOP values by as much as 17 mmHg in normal eyes and more than 20 mmHg in eyes with corneal pathology. IOPcc effectively eliminates these influences on the pressure measurement.


Compensated IOP (IOPcc) - A pressure measurement that is less affected by the cornea than other methods of tonometry. IOPcc is patented technology, exclusive to Reichert. 
- IOPcc is less affected by corneal properties than Goldmann
- IOPcc is a better indicator of glaucomatous damage than Goldmann tonometry


How is Corneal Hysteresis measured?

Corneal Hysteresis is the difference in the inward and outward pressure values obtained during the patented dynamic bi-directional applanation process utilized by the Ocular Response Analyzer. It is a characterization of the cornea’s ability to absorb and dissipate energy, which is a function of visco-elastic biomechanical properties of the cornea. 


Unparalleled user experience. 

Measurements could not be quicker or simpler with Ocular Response Analyzer G3. A single touch of the intuitive user interface initiates a fully automated alignment and measurement, simultaneously displaying Corneal Compensated IOP (IOPcc), Corneal Hysteresis (CH), Goldmann correlated IOP (IOPg), and Waveform Score (WS).


Confidence, reliability and efficiency.

The advanced, patent-pending Waveform Score feature, combined with Reichert’s unique intelligent averaging technique, enhances measurement reliability and repeatability so operators can be confident in the accuracy of the measurement results. Operators can easily access all functions through the integrated touch screen display, including export of patient data for effortless EMR integration. Delegate your tonometry and Corneal Hysteresis measurements to trained technicians with ease.


Non-contact saves time and money. 

Because the Ocular Response Analyzer G3 measurement is rapid and non-contact the use of topical anesthesia and/or fluorescein drops is not required, saving time and money. In addition, the risk of cross contamination is greatly reduced. The need for time-consuming sterilization of tonometer prisms, costly replacement of prisms, or use of expensive disposables is eliminated.


Unique design with patients in mind.

Ocular Response Analyzer G3 is designed with no chinrest, which saves time by simplifying patient positioning. This unique design also makes patients more comfortable and less intimidated by not feeling confined in a chinrest.


Patented air pulse, maximum comfort.

Reichert’s automatic, non-linear pressure ramp customizes the air pulse, in real time, for each eye being measured. This patented feature enables the softest possible air pulse, ensuring maximum patient comfort. In a pediatric study conducted on children between the ages of 4-18 years old found, “Overall cooperation was much better with ORA (89.8%) than with Goldmann applanation (78.7%), and all the children we questioned preferred this (ORA) technique.”7


CPT® Code 92145 published for Corneal Hysteresis.

A new CPT code, 92145, has been published specifically for the Corneal Hysteresis measurement provided by the Reichert® Ocular Response Analyzer®. In the 2015 CPT handbook, a new, permanent, Category I CPT code, 92145 (Corneal hysteresis determination, by air impulse stimulation, unilateral or bilateral, with interpretation and report), replaces the prior temporary, Category III CPT code, 0181T. The new code took effect January 1, 2015. For more information regarding CPT Code 92145, please consult your medical billing specialist.


Made in the USA.

Ocular Response Analyzer G3 is proudly made in the USA at our state-of-the-art world headquarters in Buffalo, New York.

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