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Performance of a new binocular wavefront aberrometer based on a self-imaging diffractive sensor.

Laurence Warden¹, Yueai Liu, Perry S Binder

¹Ophthonix Inc, 1491 Poinsetta Ave, Vista, CA 92081, USA.

Journal of Refractive Surgery (Thorofare, N.J. : 1995)

|February 27, 2008

Summary

The Ophthonix Z-View aberrometer demonstrated superior accuracy in higher-order measurements compared to Hartmann-Shack systems. Wavefront refraction from the Z-View correlated well with manifest refraction in human eyes.

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Area of Science:

Ophthalmology
Optical Engineering
Medical Devices

Background:

Accurate wavefront measurement is crucial for refractive surgery and vision correction.
Aberrometry is a key technology for quantifying ocular aberrations.
Comparing different aberrometer technologies is essential for clinical adoption.

Purpose of the Study:

To evaluate the performance of the Ophthonix Z-View diffractive aberrometer.
To compare the Z-View against two Hartmann-Shack aberrometers (Alcon LADARWave and VISX WaveScan).
To assess accuracy, linearity, and repeatability of higher and lower order aberrations.

Main Methods:

The Ophthonix Z-View was tested against LADARWave and WaveScan using four model eyes and 68 human eyes.
Fixed and movable retinal surface model eyes were used to assess higher and lower order accuracy.
Manifest refraction spherical equivalent was compared with aberrometer-calculated values in human eyes.

Main Results:

The Z-View showed higher accuracy and lower noise in higher-order measurements of fixed model eyes (0.48 µm RMS difference).
Repeatability was excellent for all systems, with Z-View showing slightly lower inter-measurement standard deviation (0.024 µm).
Performance was similar across systems for the movable retina model and in comparing manifest refraction spherical equivalent.

Conclusions:

The Ophthonix Z-View aberrometer exhibits high accuracy and repeatability, particularly for higher-order aberrations.
Wavefront measurements from the Z-View show good correlation with clinical manifest refraction.
The Z-View is a viable alternative to existing Hartmann-Shack aberrometers for ophthalmic applications.