Assessing Visual Quality With the Point Spread Function Using the NIDEK OPD-Scan II

Abstract

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. 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. 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. 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.