Blanka Golebiowski1, Eric Papas, Fiona Stapleton. 1. Vision CRC and School of Optometry and Vision Science, University of New South Wales, Sydney, Australia. b.golebiowski@visioncrc.org
Abstract
PURPOSE: To determine the repeatability of an unequal staircase technique (Garcia-Perez Staircase, GPS) to measure corneal mechanical threshold using the CRCERT-belmonte Aesthesiometer, and to compare this with a previously-reported psychophysical method (method of constant stimuli, MOCS). METHODS: The GPS, utilising unequal ascending and descending steps, was used to obtain a threshold measurement from the mean of six response reversals. repeatability was determined for the GPS and MOCS methods (N = 14), and threshold results obtained with each method were compared (N = 10). RESULTS: The GPS (65.0 +/- 16.9 mL min(-1); CoR +/- 18.3 mL min(-1)) method was more repeatable than the MOCS (64.0 +/- 15.7 mL min(-1); CoR +/- 37.3 mL min(-1)) and the absolute values obtained with the two methods were not significantly different. CONCLUSIONS: Although each method gave equivalent threshold results, the GPS method was more repeatable and quicker to apply and hence should reduce the influence of patient fatigue and help to minimise possible carry-over effects.
PURPOSE: To determine the repeatability of an unequal staircase technique (Garcia-Perez Staircase, GPS) to measure corneal mechanical threshold using the CRCERT-belmonte Aesthesiometer, and to compare this with a previously-reported psychophysical method (method of constant stimuli, MOCS). METHODS: The GPS, utilising unequal ascending and descending steps, was used to obtain a threshold measurement from the mean of six response reversals. repeatability was determined for the GPS and MOCS methods (N = 14), and threshold results obtained with each method were compared (N = 10). RESULTS: The GPS (65.0 +/- 16.9 mL min(-1); CoR +/- 18.3 mL min(-1)) method was more repeatable than the MOCS (64.0 +/- 15.7 mL min(-1); CoR +/- 37.3 mL min(-1)) and the absolute values obtained with the two methods were not significantly different. CONCLUSIONS: Although each method gave equivalent threshold results, the GPS method was more repeatable and quicker to apply and hence should reduce the influence of patientfatigue and help to minimise possible carry-over effects.
Authors: Fiona Stapleton; Carl Marfurt; Blanka Golebiowski; Mark Rosenblatt; David Bereiter; Carolyn Begley; Darlene Dartt; Juana Gallar; Carlos Belmonte; Pedram Hamrah; Mark Willcox Journal: Invest Ophthalmol Vis Sci Date: 2013-10-18 Impact factor: 4.799
Authors: Carlos Belmonte; Jason J Nichols; Stephanie M Cox; James A Brock; Carolyn G Begley; David A Bereiter; Darlene A Dartt; Anat Galor; Pedram Hamrah; Jason J Ivanusic; Deborah S Jacobs; Nancy A McNamara; Mark I Rosenblatt; Fiona Stapleton; James S Wolffsohn Journal: Ocul Surf Date: 2017-07-20 Impact factor: 5.033
Authors: Mariela C Aguilar; Alex Gonzalez; Cornelis Rowaan; Carolina de Freitas; Karam A Alawa; Heather Durkee; William J Feuer; Fabrice Manns; Shihab S Asfour; Byron L Lam; Jean-Marie A Parel Journal: Biomed Opt Express Date: 2018-10-18 Impact factor: 3.732