title: Technical note: the effect of refractive blur on colour vision evaluated using the Cambridge Colour Test, the Ishihara Pseudoisochromatic Plates and the Farnsworth Munsell 100 Hue Test.
abstract: The results of a prospective study examining the effect of refractive blur on colour vision performance in normal subjects measured with three different colour vision tests are reported. The Farnsworth Munsell 100 Hue (FM100) and Cambridge Colour Test (CCT) results were significantly affected at +6 D of spherical refractive blur, whereas those from the Ishihara Pseudoisochromatic Plate (IPP) test were not. In a clinical setting, correction of refractive error up to 3 D for colour vision testing with these tests may not be required. Poor colour vision should not be attributed solely to refractive causes of poor visual acuity (Snellen equivalent: >6/36). Fastest test times were achieved using IPP, followed by CCT.
authors.affiliation: Department of Ophthalmology, St Thomas' Hospital, London, UK. srithyagarajan@doctors.org.uk
authors.forename: Sri
authors.initials: S
authors.lastname: Thyagarajan
authors.forename: Philip
authors.initials: P
authors.lastname: Moradi
authors.forename: Luke
authors.initials: L
authors.lastname: Membrey
authors.forename: D
authors.initials: D
authors.lastname: Alistair
authors.forename: H
authors.initials: H
authors.lastname: Laidlaw
mesh_terms: D000328:Adult; D003118:Color Perception / Q000502:physiology*; D003119:Color Perception Tests / Q000379:methods*; D003117:Color Vision Defects / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008297:Male; D011446:Prospective Studies; D012030:Refractive Errors / Q000503:physiopathology*