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

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.