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Physician: Optical analysis technology the future of lens-based refractive surgery

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PARIS — The double-pass Optical Quality Analysis System from Visiometrics will soon become the gold standard for analyzing anterior segment-related quality of vision, according to a speaker here.

"The Optical Quality Analysis System is the only currently available system that provides all the information that is indispensable for complete and true evaluation of visual function because of its unique capability of measuring the combined effects of both high-order aberrations and the loss of ocular tissue transparency on the quality of retinal image," Damien Gatinel, MD, said at the annual meeting of the French Society of Ophthalmology.

All of the information provided by the Optical Quality Analysis System (OQAS) is gathered from the analysis of the point spread function (PSF), which is three-dimensionally represented by the system.

"This representation allows an easier and more accurate analysis and interpretation of the PSF," Dr. Gatinel said.

The main indices provided by the OQAS are the index of predicted contrast visual acuity at 100%, 50%, 20% and 9% contrast, taking into account the optical characteristics of the eye in terms of optical aberrations and light scattering; the curve of modulation transfer function, which represents the percentage of attenuation of contrast of the retinal image at different spatial frequencies, again taking into account the combined effects of scattering and higher-order aberrations; and the scattering index, which quantifies the degree of scattering caused by haze, corneal opacification, cataract and vitreous opacities, he said.

"The OQAS will be able to give precious information to all clinicians involved in the study and treatment of the different pathologies that lead to a reduction of ocular transparency, cataract in the first place," Dr. Gatinel said. "It will be a predictor of the optical performance of both monofocal and multifocal lenses.

"Current wavefront analyzers, like the Shack-Hartmann, are unable to detect and measure distortions in the wavefront induced by multifocal implants," he said. "Only double-pass aberrometry can provide objective estimation of the optical quality of multifocal implants."