title: Measuring Visual Function Using the MultiQuity System: Comparison with an Established Device.
abstract: Purpose. To compare measures of visual acuity (VA) and contrast sensitivity (CS) from the Thompson Xpert 2000 and MultiQuity (MiQ) devices. Methods. Corrected distance VA (CDVA) and CS were measured in the right eye of 73 subjects, on an established system (Thompson Xpert) and a novel system (MiQ 720). Regression was used to convert MiQ scores into the Thompson scale. Agreement between the converted MiQ and Thompson scores was investigated using standard agreement indices. Test-retest variability for both devices was also investigated, for a separate sample of 24 subjects. Results. For CDVA, agreement was strong between the MiQ and Thomson devices (accuracy = 0.993, precision = 0.889, CCC = 0.883). For CS, agreement was also strong (accuracy = 0.996, precision = 0.911, CCC = 0.907). Agreement was unaffected by demographic variables or by presence/absence of ocular pathology. Test-retest agreement indices for both devices were excellent: in the range 0.88-0.96 for CDVA and in the range 0.90-0.98 for CS. Conclusion. MiQ measurements exhibit strong agreement with corresponding Thomson measurements, and test-retest results are good for both devices. Agreement between the two devices is unaffected by age or ocular pathology.
authors.affiliation: Macular Pigment Research Group, Department of Chemical & Life Sciences, Waterford Institute of Technology, Waterford, Ireland.
authors.forename: Patrycja
authors.identifier: 0000-0003-2491-8249
authors.initials: P
authors.lastname: Smolarek-Kasprzak
authors.affiliation: Macular Pigment Research Group, Department of Chemical & Life Sciences, Waterford Institute of Technology, Waterford, Ireland ; Institute of Vision Research, Whitfield Clinic, Waterford, Ireland ; Macular Pigment Research Group, Vision Research Centre, Carriganore House, Waterford Institute of Technology, West Campus, Carriganore, Waterford, Ireland.
authors.forename: John M
authors.initials: JM
authors.lastname: Nolan
authors.affiliation: Macular Pigment Research Group, Department of Chemical & Life Sciences, Waterford Institute of Technology, Waterford, Ireland ; Institute of Vision Research, Whitfield Clinic, Waterford, Ireland.
authors.forename: Stephen
authors.identifier: 0000-0001-7620-7903
authors.initials: S
authors.lastname: Beatty
authors.affiliation: Macular Pigment Research Group, Department of Chemical & Life Sciences, Waterford Institute of Technology, Waterford, Ireland.
authors.forename: Jessica
authors.initials: J
authors.lastname: Dennison
authors.affiliation: Macular Pigment Research Group, Department of Chemical & Life Sciences, Waterford Institute of Technology, Waterford, Ireland.
authors.forename: Kwadwo Owusu
authors.initials: KO
authors.lastname: Akuffo
authors.affiliation: Sightrisk Ltd., Carriganore House, Waterford Institute of Technology, West Campus, Carriganore, Waterford, Ireland.
authors.forename: Robert
authors.initials: R
authors.lastname: Kuchling
authors.affiliation: Macular Pigment Research Group, Department of Chemical & Life Sciences, Waterford Institute of Technology, Waterford, Ireland.
authors.forename: Jim
authors.identifier: 0000-0003-4392-4564
authors.initials: J
authors.lastname: Stack
authors.affiliation: Sightrisk Ltd., Carriganore House, Waterford Institute of Technology, West Campus, Carriganore, Waterford, Ireland.
authors.forename: Graham
authors.initials: G
authors.lastname: O'Regan