Applications of wavefront technology

Abstract

This review of wavefront technology looks at 2 major aspects. The first is the basics and principles of the optics of the eye, how to decompose the wavefront in a more adequate way for interpretation, and how these aberrations affect the visual acuity. It also addresses the diversity and complexity of wavefront sensors; how these devices transform the principles into clinically useful data, with the advantages and limitations of each system. The second major aspect is the clinical uses of the technology: wavefront-guided and newer and enhanced profiles related to wavefront as well as the limitations of the technology. Finally, recent innovations made possible by wavefront technology that are not limited to refractive surgery are reviewed.

Comparative study on optical performance and visual outcomes between two diffractive multifocal lenses: AMO Tecnis® ZMB00 and AcrySof® IQ ReSTOR® Multifocal IOL SN6AD1

“…The value usually decreases as the pupil increases, expanding the influence of optical aberrations that compromise quality. Larger or smaller values for similar pupil conditions correspond to better or worse visual quality (9) . Our results suggested equivalence between the two lenses.…”

“…Unlike other studies, we sought to evaluate aberrometry under conditions of mesopic pupil in an attempt to detect the manifestation of wavefront function under physiological conditions without the use of pharmacological mydriasis (13) . The following variables were collected: (1) total aberration, (2) high-order spherical aberration, (3) tilt, (4) coma, and (5) Strehl ratio (8,9) . Finally, the visual monocular defocus curve was evaluated in long-distance visual acuity, corrected using the same ETDRS chart at a distance of 4 m, at intervals of 0.50 spherical diopters from -5.00 to +2.50 D (21) .…”

“…The addition promoted by the lens, whether it is +2.5 diopters (D), +3.0 D, or +4.0 D, influences the best reading distance and depth of focus. These different compositions culminate in distinctly different optical aberrometric behaviors (8)(9)(10) . In this study, we compared visual parameters, optical performance, contrast sensitivity (CS), and wavefront analysis results between two different types of multifocal lenses currently available in the market: AcrySof® IQ ReSTOR® Multifocal IOL SN6AD1 (Alcon Laboratories, Inc., Irvine, CA, USA) and AMO Tecnis® ZMB00 (Abbott Medical Optics, Santa Ana, CA, USA).…”

Ocular Wavefront Aberrations and Optical Quality in Diabetic Macular Edema

“…This approach gives the clinician better information about the image-forming optical properties of the studied eye. [26][27][28] In our study, two different image quality metrics, Strehl ratio and MTF, were used to characterize visual function of patients with diabetes. Compared with control subjects, both the ocular and internal Strehl ratio and MTF calculated for HO aberrations were worse in the DME group.…”

Dysfunctional lens syndrome

“…Other instruments in addition to the iTrace (Tracey Technologies, Houston, TX) which can be used in the differential diagnosis or contributing to the diagnostic process of DLS via more analysis of the crystalline lens are such as HD Analyzer (Visiometrics, Barcelona) a double-pass wavefront device that measures light scatter which provides an optical scatter index (OSI) and a simulated visual acuity reading; Nidek/Marco OPD-Scan III (NIDEK CO., LTD.) with the ability to separate the internal and external aberrations; Oculus Pentacam (Oculus Optikgeräte GmbH, Wetzlar, Germany) to check the densitometry on different parts of crystalline lens on the Scheimpflug image [7].…”