Abstract
The Tracey Technologies iTrace represents a sophisticated 5-in-1 diagnostic platform integrating autorefraction, corneal topography, ray tracing aberrometry, pupillometry, and autokeratometry in a single instrument. This system fundamentally differs from traditional Shack-Hartmann aberrometers through its proprietary ray-tracing methodology.
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Core Technology:
5-in-1 diagnostic platform: autorefraction, corneal topography, ray tracing aberrometry, pupillometry, and autokeratometry
Sequential ray-tracing methodology using 256 near-infrared laser beams at 655 nm wavelength
270 measurement points for mathematical prescription determination
Ray-Tracing Specifications:
Point-by-point retinal spot pattern analysis measuring light energy transfer and beam positioning
Forward ray-tracing analysis (entrance pupil to retina) vs. reverse ray-tracing in Shack-Hartmann systems
Real-time pupil tracking and dynamic measurement capability
Corneal Topography:
Placido disk system (Vista format by EyeSys Vision Inc.) with 655 nm laser diode</parameter>
Wavefront keratometric analysis using Zernike polynomial fitting within 4mm optical zone
Capability to subtract corneal aberrations from total ocular aberrations, isolating internal optics contributions
Measurement Parameters:
Sphere: -20.00D to +20.00D (0.25D steps)
Cylinder: 0.00D to -8.00D (0.25D steps)
Axis: 1° to 180° (1° steps)
Pupil diameter measurement range: 2.0mm to 9.0mm
Zernike polynomial analysis up to 7th order
Accommodation stimulus measurement capability
Clinical Advantages:
Superior accuracy for toric IOL calculations compared to simulated keratometry
Differentiation between corneal vs. lenticular aberrations for surgical planning
Dynamic pupillometry under photopic/mesopic/scotopic conditions
Point Spread Function (PSF) and Modulation Transfer Function (MTF) analysis
Quality metrics including Strehl ratio and RMS values
Workflow Integration:
Single-capture measurement protocol
DICOM connectivity and EMR integration
Comprehensive reporting with IOL calculation modules
Contact lens fitting nomograms and refractive surgery planning tools
The iTrace's ray-tracing approach provides clinically relevant forward aberration measurement, particularly valuable for premium IOL selection where understanding how light actually travels through the eye to the retina is critical for predicting postoperative visual quality.