title: Use of suprathreshold test data to predict the results of quantitative testing in the nasal periphery.
abstract: We compared the results of suprathreshold testing of the nasal periphery with those of quantitative assessment of the same area. One eye each from 81 patients in four categories (normal [21 subjects], low-risk ocular hypertensive [20 subjects], high-risk ocular hypertensive [20 subjects] and early glaucoma [20 subjects]) was tested with the nasal suprathreshold points of the Octopus G1 program and the Sargon peripheral field-nasal (PFN) program. Simple algorithms were developed to generate from the nasal suprathreshold points of the G1 program two "qualitative indices", mean defect-qualitative (MD-Q) and loss variance-qualitative (LV-Q); these are analogous to the indices mean defect and loss variance respectively, which were calculated from the PFN program data. MD-Q and LV-Q were found to be well correlated with their quantitative counterparts. They provide a uniform method for interpreting the nasal suprathreshold points of the G1 program and help identify patients in whom further quantitative testing is likely to yield useful information.
authors.affiliation: Department of Ophthalmology, Dalhousie University, Halifax.
authors.forename: A
authors.initials: A
authors.lastname: Orr
authors.forename: M
authors.initials: M
authors.lastname: Rubillowicz
authors.forename: R
authors.initials: R
authors.lastname: LeBlanc
authors.forename: C
authors.initials: C
authors.lastname: Seamone
authors.forename: C
authors.initials: C
authors.lastname: Mann
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000465:Algorithms; D000704:Analysis of Variance; D005902:Glaucoma, Open-Angle / Q000175:diagnosis*; D006801:Humans; D007429:Intraocular Pressure; D008875:Middle Aged; D009798:Ocular Hypertension / Q000175:diagnosis*; D011237:Predictive Value of Tests; D012307:Risk Factors; D058609:Visual Field Tests / Q000379:methods; D014794:Visual Fields