ABSTRACT
PURPOSE: To present the use of the point spread function (PSF) metric pre- and postoperatively for the assessment of visual quality in cataract and refractive surgery. METHODS: Case examples of cataract and refractive surgery and the effect of accommodation are presented. All PSF measurements were obtained using the NIDEK OPD-Scan II, and corneal internal and total aberrations were simulated using the NIDEK OPD-Station software. All eyes underwent corneal topography, wavefront aberrometry, autorefraction, keratometry, and pupillometry measurements pre- and postoperatively using the OPD-Scan II. The PSF was used to assess visual quality. RESULTS: Four case examples including refractive surgery, aspheric multifocal intraocular lens (IOL) implantation, toric IOL implantation, and the difference in PSF due to accommodation are presented. CONCLUSIONS: The PSF in refractive and cataract surgery is a clinically valuable metric to evaluate the patient's visual quality pre- and postoperatively. The OPD-Scan II can measure the effect of accommodation and distant fixation providing an assessment of changes in visual quality.
Subject(s)
Cornea/physiopathology , Corneal Topography/methods , Myopia/physiopathology , Visual Acuity/physiology , Accommodation, Ocular/physiology , Adult , Aged , Cataract Extraction , Female , Humans , Keratomileusis, Laser In Situ/methods , Lens Implantation, Intraocular , Male , Myopia/surgery , Refraction, Ocular/physiologyABSTRACT
PURPOSE: To discuss the use of wavefront measurements generated from the NIDEK OPD-Scan II and OPD-Station for cataract surgery. METHODS: Case examples are presented along with information and relevant clinical data obtained from the OPD-Scan II aberrometer and OPD-Station software. All eyes underwent corneal topography, wavefront aberrometry, autorefraction, keratometry, and pupillometry measurements pre- and postoperatively using the OPD-Scan II. Optical and visual quality simulations, including modulation transfer functions, and visual quality attributable to corneal and internal aberrations, were performed using OPD-Station software. RESULTS: Twelve case examples from cataract surgery, including aspheric intraocular lens (IOL) implantation, diffractive IOLs, and toric IOL implantation, are presented. CONCLUSIONS: The wavefront analysis in cataract surgery was shown to be a fundamental tool in evaluating visual quality after IOL implantation. The OPD-Scan II distinguished between corneal and lenticular aberrations, allowing for evaluation of actual optical and visual performance attributable to the IOL. Our review of case examples also showed that for multifocal IOL implantation, a thorough investigation is necessary to correlate subjective and objective visual quality and for patient selection.