Home News & Insights Ray-tracing Wavefront Aberrometry: Advanced ocular diagnostics

Ray-tracing Wavefront Aberrometry: Advanced ocular diagnostics

Ray-tracing Wavefront Aberrometer

Ray-tracing wavefront aberrometry has ushered in a new era in diagnostic imaging, offering clinicians a powerful tool to assess and treat a range of visual aberrations. Among the many wavefront aberrometers available today, the iTrace stands out for its versatility and precision.

A glimpse into iTrace technology

Ray-tracing wavefront aberrometry has revolutionised the field of ophthalmology, and the iTrace, developed by Tracey Technologies, is at the forefront of this transformation.

This article delves deep into the technology behind the iTrace, its diverse applications in clinical practice, and how it’s changing the game in improving visual outcomes for patients.

iTrace is a unique diagnostic tool, combining ray tracing and Placido disk technology to capture two distinct measurements. This comprehensive analysis provides clinicians with a comprehensive overview of a patient’s visual function, including topography, wavefront, autorefraction, keratometry, day-to-night vision, pupillometry, white-to-white measurement, and more. All generated in a matter of milliseconds.

What makes the iTrace truly exceptional is its ability to provide insights into the structure of the eye and its function.

In contrast, many other devices rely on methods like Hartmann-Shack sensors or dynamic skiascopy to assess light reflected from the retina. While these methods work well for simpler optical systems, they tend to produce inaccuracies when dealing with complex cases such as highly aberrated eyes, pseudophakia, cataracts, contact lenses, or eyeglasses.

The iTrace, with its proprietary ray tracing technology, excels in replicating a patient’s vision under various conditions and circumstances.

Objectively assessing visual impairment

iTrace empowers healthcare professionals to gain a deeper understanding of the root causes behind their patients’ visual complaints. Issues like blurriness, double vision, glare, halos, night myopia, and starbursts often stem from higher-order aberrations like Coma, Spherical Aberration, and Trefoil.

Addressing these visual impairments effectively hinges on pinpointing whether these aberrations originate in the cornea or the internal optics of the eye. By leveraging the iTrace, practitioners can quickly and precisely determine whether symptoms are rooted in corneal or lens-related issues, allowing them to recommend the most appropriate course of action.

Assessing Lens Dysfunction

The iTrace goes beyond standard assessments. It gathers a range of numerical measurements and assigns grades (0-10) to a patient’s internal and corneal visual quality, using the Dysfunctional Lens Index (DLI) and the Corneal Performance Index (CPI). These values are then synthesised to create the Quality of Vision Index (QVI).

This comprehensive dataset offers precise insights into the underlying causes of vision problems, aiding in determining the optimal timing for vision correction procedures and identifying the most suitable correction approach for each unique case.

Determining Premium IOL eligibility

iTrace proves invaluable in evaluating candidates for premium intraocular lenses (PIOLs). Through iTrace scans, practitioners assess a patient’s visual axis, the pupil’s centre, and the limbus’s centre.

This data plays a pivotal role in pre-surgical planning, enabling clinicians to determine whether a patient’s optical system aligns with multifocal lenses. When the visual axis and the limbus centre closely align or fall within the same meridian, toric or multifocal lenses can produce highly favourable outcomes.

Additionally, the evaluation of the Angle Alpha and corneal wavefront is essential. When significant corneal aberrations are present, surgeons can avoid placing multifocal lenses behind a cornea with multifocal characteristics, as identified through this swift screening process.

Premium IOL demonstration

At the click of a button, the patient-friendly iTrace displays serve as a valuable tool for effortlessly conveying the distinctions between a standard and premium lens. Easily show patients with corneal astigmatism what their vision will be like after surgery, both with and without a toric lens upgrade.

Toric planning

iTrace’s Toric Planner enhances toric IOL surgical precision by utilising advanced wavefront keratometry data to determine cylinder amount and axis location. Additionally, the iTrace generates an external colour photograph that serves as a reliable reference for precise lens placement during surgery, effectively eliminating marking errors.

Toric check

iTrace Toric Check employs user-friendly maps to display the current toric lens axis location and power, providing guidance for optimising patient visual outcomes. Its ease of use is such that many surgeons rely on Toric Check screens for lens rotation assistance during surgery.

Post-operative assessment

The story doesn’t end with surgery; the iTrace remains essential for post-operative assessments. A quick 30-second iTrace exam allows clinicians to evaluate the alignment of toric lenses post-surgery, all without the need for pupil dilation. This examination calculates cross-cylinder values and checks for any off-axis or off-power toric IOLs.

Enhancing Toric IOL precision

iTrace’s post-surgical role is vital for assessing toric IOL alignment without dilation. It computes cross-cylinder values, checks for off-axis/off-power toric IOLs, and aligns lens cylinder power with corneal steep axis, confirmed by wavefront map and topography.

Unique ray tracing enables accurate post-surgical refraction predictions and rotation suggestions, enhancing patient discussions based on cylinder changes.

Versatile applications

While the iTrace’s prowess is evident in toric lens evaluations, its capabilities extend beyond these procedures. Its ability to accurately scan the complex architecture of premium IOLs makes it invaluable for identifying the causes of poor vision after premium lens implantation, all without the need for pupil dilation.

“iTrace gets it right the first time and is incredibly useful for problem patients. It highlights issues and provides solutions.” Mr Ged Ainsworth, Consultant Ophthalmologist, Lakeland Vision.

Seize the power of precision

The iTrace Ray Tracing Wavefront Aberrometer has carved out a unique niche in the field of ophthalmology. Its innovative combination of ray tracing and Placido disk technology empowers clinicians to provide comprehensive assessments and deliver tailored solutions to their patients.

From pre-surgical planning to post-operative evaluations, iTrace has proven its worth as an indispensable tool in improving visual outcomes and enhancing patient satisfaction.

With iTrace, ophthalmologists can not only diagnose visual aberrations with precision but also ensure that each patient receives the most suitable and effective treatment, thereby making strides in the quest for better vision and enhanced quality of life.