ITrace Wavefront Aberrometer

Abstract

The Tracey Technologies iTrace is a 5-in-1 ophthalmic diagnostic platform combining patented sequential ray-tracing aberrometry (256 points at 655/785nm wavelengths) with Placido-disk topography (24 rings, 8,640 points), autorefraction (±15D sphere/±10D cylinder), keratometry, and pupillometry (2.5-8mm range), uniquely separating corneal from internal aberrations and featuring proprietary DLI™/CPI™/QVI™ indices, marker-free Toric IOL planning/verification, and no-dilation post-op assessment capabilities.

Technology Type: Sequential ray-tracing (forward aberration measurement)
Light Source: Near-infrared laser diode
Wavelength: 655 nm (topography) and 785 nm (ray tracing aberrometry)
Number of Measurement Points: 256 parallel laser beams projected sequentially
Measurement Principle: Measures where each light ray lands on the retina and quantifies light energy transfer
Unique Capability: Only aberrometer using forward ray-tracing (measures light going into the eye, not reflected back)

Corneal Topography

Technology: Placido disk-based system (Vista format by EyeSys Vision)
Number of Rings: 24 concentric rings
Measured/Analyzed Points: 8,640 data points
Corneal Coverage: 8 mm diameter on 42.5D sphere
Dioptric Range: 33.75 to 61.36 D

TECHNICAL SPECIFICATIONS

Refraction Measurements

Sphere Range: ±15.0 D
Cylinder Range: ±10.0 D
Measurement Accuracy: ±0.10 D
Reproducibility: ±0.10 D
Correlation with Manifest Refraction: T = 0.9925 (ranges -0.01 to -0.4 D)

Pupil Analysis

Pupil Scan Size Range: 2.5 mm to 8.0 mm diameter
Pupillometry: Automatic measurement under various lighting conditions
Day/Night Vision Analysis: Pupil size tracking for photopic and mesopic conditions

Keratometry

Measurement Type: Automated keratometry (flat and steep meridians)
Based On: Combined corneal topography and wavefront data
Applications: IOL calculations, toric lens planning, corneal power assessment

Aberration Analysis

Lower-Order Aberrations (LOA): Sphere, cylinder, defocus
Higher-Order Aberrations (HOA): Coma, trefoil, spherical aberration, secondary astigmatism, tetrafoil
Zernike Polynomial Analysis: Complete wavefront decomposition
Measurement Separation: Total, corneal, and internal (lenticular) aberrations analyzed separately

PHYSICAL SPECIFICATIONS

Footprint Dimensions: 13.0 inches (33.0 cm) × 17.0 inches (43.2 cm)
Weight: 27.4 lbs (12.4 kg / 20 kg depending on configuration)
Portability: Compact, space-saving design suitable for clinical settings
Capture Modes: Automatic and manual

CLINICAL ANALYSIS CAPABILITIES

Proprietary Indices (iTrace Prime Dashboard)

**Dysfunctional Lens Index (DLI™)**Quantifies vision loss attributed to the crystalline lensScale: 0-10 (objective grading)Used for cataract diagnosis and premium IOL candidacy
**Corneal Performance Index (CPI™)**Quantifies vision loss attributed to the corneaScale: 0-10 (objective grading)Identifies corneal aberrations and irregularities
**Quality of Vision Index (QVI™)**Combined total eye visual quality metricSum of corneal and lenticular contributionsComprehensive vision assessment tool
**Tear Film Index (TFI)**Assesses ocular surface stabilityEvaluates pre-operative tear film qualityCritical for refractive surgery screening

Visual Function Analysis

Retinal Spot Diagram (RSD): Graphical representation of total refraction, aberrations, and point spread function
Point Spread Function (PSF): Predicts retinal image quality
Modulation Transfer Function (MTF): Contrast sensitivity analysis
Multi-Zone Refraction Analysis: Refraction across different pupil zones
Wavefront Maps: Color-coded aberration maps (values in microns)

SPECIALIZED CLINICAL FEATURES

Toric IOL Planning & Verification

Toric Planner toric calculator using advanced iTrace keratometryPortable eye image maps for precise intraoperative lens alignmentUses natural iris landmarks for marker-free alignmentOptical alignment angle measurement
Toric Check (Post-Operative):NO DILATION REQUIRED - 30-second examinationDetermines if toric IOL is off-axis or off-powerCalculates predicted BCVA change with lens rotationProvides rotation recommendations

Premium IOL Candidacy Assessment

Visual Axis Identification: Locates patient's visual axis relative to pupil center
Optical System Alignment: Determines multifocal IOL compatibility
Kappa Angle Measurement: Assesses distance between visual axis and limbus center
Pre-screening Tool: Predicts which patients will benefit from premium lenses

Patient Education Tools

Visual Simulation: Shows patients their actual vision vs. corrected vision
Snellen E Simulation: Demonstrates blurred vs. clear vision with/without correction
Toric vs. Standard IOL Comparison: Visual comparison for astigmatic patients
Objective Metrics: DLI, CPI, QVI communicated in patient-friendly format

DATA PROCESSING & OUTPUT

Acquisition & Analysis

Scan Time: Under 1 minute for complete profile
Data Processing: Point-by-point sequential analysis
Internal Optometer: Automatic patient alignment and accommodation control
Fogging Range: +7D to -5D (eliminates accommodation)
Fixation: Binocular and monocular open-field (reduces accommodation)

Integration & Connectivity

DICOM Compliance: Full integration (Version 6.3+)
Network Capability: Networkable system
Worklist Import: Managed worklist reduces data entry errors
Batch Processing: Batch saving and printing capabilities
Report Generation: Comprehensive, easy-to-interpret printable reports

Measurement Capabilities

Over-Spectacle Measurement: Can measure through spectacles
Post-Operative Analysis: Functions through IOLs, contact lenses, after LASIK
Highly Aberrated Eyes: Effective even with significant optical irregularities
Pseudophakia: Accurate measurements in patients with IOLs
Cataract Assessment: Can measure through early cataracts

CLINICAL APPLICATIONS

Refractive Surgery

Pre-operative screening and planning
LASIK/PRK candidate evaluation
Post-operative outcomes assessment
Identifying causes of post-operative visual complaints
Wavefront-guided treatment planning

Cataract Surgery

Dysfunctional Lens Syndrome diagnosis
Premium IOL candidate selection (multifocal, toric, accommodating)
IOL power calculation optimization
Toric IOL axis planning and verification
Post-operative lens position assessment

General Ophthalmology & Optometry

Differential diagnosis of vision complaints
Corneal disease monitoring (keratoconus, irregular astigmatism)
Contact lens fitting optimization
Second-opinion evaluations
Progression tracking of lens and corneal dysfunction

Research Applications

Clinical studies requiring precise optical measurements
Aberration analysis in various patient populations
IOL performance evaluation
Normal population reference databases

SOFTWARE VERSIONS & UPGRADES

Current Version: iTrace 7.0 (iTrace Prime)

Key Features:

Prime Dashboard (DLI, CPI, QVI indices)
Enhanced imaging quality
Improved wavefront capture process
Enhanced navigation between displays
Batch saving and printing
Toric Planner customization improvements
Tech Triage icon (quality control for technicians)
Exam Results display (validates scan quality)

Previous Major Versions:

Version 6.3: Added DICOM compliance
Version 6.1: Introduced Toric Check feature
Version 6.0: Introduced Dysfunctional Lens Index (DLI)
Version 4.0: Made diagnostic aberrometry accessible to all physicians

Upgrade Policy: Existing iTrace owners can upgrade software to access latest features

MEASUREMENT ACCURACY & VALIDATION

Clinical Studies

High concordance with manifest refraction (T = 0.9925)
More accurate than Hartmann-Shack aberrometers in post-refractive surgery eyes
Excellent repeatability for spherical aberration and multiple aberrometric coefficients
Intraclass correlation coefficients (ICC) > 0.96 for angle kappa measurements

Repeatability

Low within-subject standard deviation (Sw) for most measurements
Coefficient of variation (COV) better for lower-order aberrations
Repeatability affected by tear film quality (assess tear film before imaging)

Interdevice Comparisons

Comparable to Pentacam, OPD-Scan, and other aberrometers for specific parameters
Unique capability to separate corneal from internal aberrations
Different measurement principles may yield non-interchangeable Zernike coefficients

COMPETITIVE ADVANTAGES

Only Ray-Tracing Aberrometer: Measures forward aberrations (how eye actually uses light)
Corneal vs. Internal Separation: Only device that mathematically separates corneal from lenticular aberrations
Post-Operative Capability: Accurate measurements through IOLs, contact lenses, after refractive surgery
No Dilation Toric Check: Unique post-operative toric assessment without dilation
5-in-1 Integration: Eliminates need for multiple separate devices
Patient Education: Visual simulation capabilities for enhanced patient communication
Compact Footprint: Space-efficient design vs. multiple standalone devices

COMPATIBILITY & INTEGRATION

Compatible with major EMR/EHR systems (via DICOM)
Integrates with surgical planning software
Exports data for IOL calculation programs
Network-ready for multi-location practices
Standalone computer included (HP Panel PC with Intel i5 processor)

CLINICAL VALIDATION & ADOPTION

Used extensively in research institutions for clinical studies
Adopted by thousands of ophthalmology and optometry practices worldwide
Referenced in numerous peer-reviewed publications
Standard of care for practices performing premium cataract surgery
Endorsed by leading ophthalmologists for toric and multifocal IOL procedures

Visreed