Nino Hirnschall1, Alja Crnej1, Vinod Gangwani1, Oliver Findl2. 1. From Moorfields Eye Hospital NHS Foundation Trust (Hirnschall, Crnej, Gangwani, Findl), London, United Kingdom; the Department of Ophthalmology (Hirnschall, Findl), Vienna Institute for Research in Ocular Surgery, a Karl Landsteiner Institute, Hanusch Hospital, Vienna, Austria. 2. From Moorfields Eye Hospital NHS Foundation Trust (Hirnschall, Crnej, Gangwani, Findl), London, United Kingdom; the Department of Ophthalmology (Hirnschall, Findl), Vienna Institute for Research in Ocular Surgery, a Karl Landsteiner Institute, Hanusch Hospital, Vienna, Austria. Electronic address: oliver@findl.at.
Abstract
PURPOSE: To compare forward and backward light scattering measurements to quantify posterior capsule opacification (PCO). SETTING: Vienna Institute for Research in Ocular Surgery, Vienna, Austria. DESIGN: Prospective single-center study. METHODS: This observational study comprised consecutive patients scheduled for neodymium:YAG (Nd:YAG) capsulotomy for regeneratory PCO. The corrected distance visual acuity (CDVA) using Early Treatment of Diabetic Retinopathy Study charts and the contrast sensitivity under mesopic and photopic conditions using Pelli-Robson charts were assessed before an Nd:YAG capsulotomy was performed. Retroillumination images, rotating Scheimpflug scans (Pentacam HR), and straylight meter (C-Quant) and point-spread function (PSF) meter (Optical Quality Analysis System) measurements were performed before and after Nd:YAG capsulotomy. RESULTS: The study enrolled 50 eyes of 50 patients. The mean uncorrected distance visual acuity and CDVA were 0.76 logMAR ± 0.18 (SD) and 0.68 ± 0.2 logMAR, respectively. The mean log contrast sensitivity (logCS) was 1.2 ± 0.15 logCS under photopic conditions and 1.05 ± 0.15 logCS under mesopic conditions. There was a moderate correlation between the Scheimpflug score and the Automated Quantification of After-Cataract score (r(2) = 0.37, P=.03). Furthermore, a moderate and close to significant correlation between the PSF meter and the straylight meter was observed (r(2) = 0.32; P=.07). CONCLUSION: Each of the 4 devices assesses different aspects of a patient's quality of vision. Further developments should focus on methods that measure forward scatter of light in a large visual angle and are not too patient or examiner dependent.
PURPOSE: To compare forward and backward light scattering measurements to quantify posterior capsule opacification (PCO). SETTING: Vienna Institute for Research in Ocular Surgery, Vienna, Austria. DESIGN: Prospective single-center study. METHODS: This observational study comprised consecutive patients scheduled for neodymium:YAG (Nd:YAG) capsulotomy for regeneratory PCO. The corrected distance visual acuity (CDVA) using Early Treatment of Diabetic Retinopathy Study charts and the contrast sensitivity under mesopic and photopic conditions using Pelli-Robson charts were assessed before an Nd:YAG capsulotomy was performed. Retroillumination images, rotating Scheimpflug scans (Pentacam HR), and straylight meter (C-Quant) and point-spread function (PSF) meter (Optical Quality Analysis System) measurements were performed before and after Nd:YAG capsulotomy. RESULTS: The study enrolled 50 eyes of 50 patients. The mean uncorrected distance visual acuity and CDVA were 0.76 logMAR ± 0.18 (SD) and 0.68 ± 0.2 logMAR, respectively. The mean log contrast sensitivity (logCS) was 1.2 ± 0.15 logCS under photopic conditions and 1.05 ± 0.15 logCS under mesopic conditions. There was a moderate correlation between the Scheimpflug score and the Automated Quantification of After-Cataract score (r(2) = 0.37, P=.03). Furthermore, a moderate and close to significant correlation between the PSF meter and the straylight meter was observed (r(2) = 0.32; P=.07). CONCLUSION: Each of the 4 devices assesses different aspects of a patient's quality of vision. Further developments should focus on methods that measure forward scatter of light in a large visual angle and are not too patient or examiner dependent.
Authors: Joan A Martínez-Roda; Carlos E García-Guerra; Fernando Diaz-Doutón; Jaume Pujol; Antoni Salvador; Meritxell Vilaseca Journal: Acta Ophthalmol Date: 2019-05-03 Impact factor: 3.761