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OCULAR RESPONSE ANALYZER® G3

Quick Overview

Primary Application :
• Provide information about corneal thickness and IOP
• Measures corneal hysteresis and the corneal resistance factor, two newly defined parameters that describe the cornea’s viscoelastic properties.
• Refractive surgeons use the ORA to detect degenerative corneal disease (eg, keratoconus and Fuchs’ dystrophy) and, in some cases, to predict the risk of ectasia after corneal refractive surgery
• Preliminary research suggests that this instrument may also help clinicians to understand the relationship between corneal biomechanics and the pathophysiology of glaucoma

Product Description :
• In 2004, Reichert Ophthalmic Instruments, Inc. (Depew, NY) , introduced the Ocular Response Analyzer (ORA)
• It has built-in eye tracking software which automatically positions the instrument’s sensor over patients’ eyes. (Figure 1)
• Once ORA in place, it directs a stream of air toward the eye that first flattens (applanates) and then indents the cornea.
• During applanation, the infrared light reflected by the cornea aligns with the detector.
• This event is recorded as peak (P1) on the ORA’s signal plot (Figure 2)
• As the device continues to direct air toward the eye, the cornea becomes concave, the light disperses, and the applanation signal decreases
• The light realigns with the infrared detector after the air pulse is discontinued and the cornea passes through a second applanation event (recorded as P2 on the signal plot).
• At the end of the test, the cornea returns to its baseline convex shape.

Features & Benefits :
• The ORA provides four distinct measurements: two IOP values and two corneal biomechanical values.
• The first IOP value is an estimate of Goldmann IOP (IOPG) and corresponds to the IOP value at the first applanation point in the ORA waveform (P1) .
• The second IOP value, IOPCC, is an estimate of IOP corrected for the biomechanical properties of the cornea.
• The two biomechanical values provided by the ORA are called corneal hysteresis and the corneal resistance factor
• Corneal hysteresis is a quantification of the cornea’s ability to absorb and/or dissipate energy (viscous damping). Corneal Hysteresis (CH) , a superior predictor of glaucoma progression, differing from thickness or topography, which are geometrical attributes. It is calculated as the difference in pressure between the two corneal applanation events (P1 minus P2) in the waveform.
• The corneal resistance factor is also derived from these two pressure values but in a more complex calculation that provides a combined estimate of both the viscous and elastic nature of the corneal tissue.
• A convenient feature of the ORA is a built-in ultrasound pachymeter with a probe , although it requires anesthesia
• Effective January 1, 2015, CPT® Code 92145, was published specifically for the Corneal Hysteresis measurement provided by Ocular Response Analyzer
Unparalleled user experience : 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 eortless EMR integration.
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 timeconsuming 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.
Made in the USA : Ocular Response Analyzer G3 is made in the USA at state-of-the-art world headquarters in Bualo, New York

MANUFACTURER : Reichert Ophthalmic Instruments, Inc. (Depew, NY,USA)

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