Ray-tracing Wavefront Aberrometer: Advancing Ocular Diagnostics

"iTrace gets it right the first time and is really useful for problem patients, highlighting issues and providing solutions." - Mr Ged Ainsworth, Lakeland Vision.

Ray-tracing Wavefront Aberrometry has transformed diagnostic imaging and, the iTrace, developed by Tracey Technologies , is a standout in this field. It combines ray tracing and Placido disk technology to swiftly capture a comprehensive set of measurements, offering a complete view of a patient's visual function, including:

→ topography

→ wavefront

→ autorefraction

→ keratometry

→ day-to-night vision

→ pupillometry

→ white-to-white measurement, and more.

iTrace's proprietary ray tracing technology projects 256 parallel light rays through the pupil, recording their landing positions on the retina and the transmitted light energy. This precision reveals invaluable insights into overall visual performance.

Unlike other devices relying on methods like Hartmann-Shack sensors or dynamic skiascopy, the iTrace's ray tracing excels in replicating a patient's vision accurately, making it ideal for complex cases.

iTrace assists in diagnosing the origins of visual problems, particularly those arising from higher-order aberrations like Coma, Spherical Aberration, and Trefoil. It distinguishes whether these issues stem from the cornea or internal optics, facilitating appropriate treatment recommendations.

The device also evaluates lens dysfunction, using the Dysfunctional Lens Index (DLI) and the Corneal Performance Index (CPI) to rate internal and corneal visual quality, ultimately generating a Quality of Vision Index (QVI). This comprehensive dataset guides precise vision correction recommendations.

For premium IOL candidates, the iTrace is invaluable. It determines visual axis alignment, pupil centre, and limbus centre, aiding in multifocal lens planning. The Angle Alpha and corneal wavefront are also assessed, helping surgeons avoid multifocal lens placement on corneas with multifocal characteristics.

Patient communication is enhanced through user-friendly displays, enabling patients with corneal astigmatism to visualise post-surgery outcomes with and without toric lenses easily.

For toric IOL surgery, iTrace's Toric Planner utilises advanced wavefront keratometry data to calculate cylinder correction magnitude and axis orientation. External colour photographs aid precise lens placement, minimising errors.

Post-surgery, a 30-second iTrace exam evaluates toric lens alignment without dilation. It checks for off-axis or off-power toric IOLs, ensuring alignment with the corneal steep axis. Ray tracing allows accurate post-surgical refraction predictions and lens rotation suggestions, enhancing patient discussions.

iTrace's capability to scan premium IOLs is key for diagnosing the causes of poor vision after premium lens implantation, making it a versatile tool for ophthalmologists.

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