Advanced

An improved method to estimate frequency of false positive answers in computerized perimetry

Olsson, J; Bengtsson, B LU ; Heijl, A LU and Rootzén, H LU (1997) In Acta Ophthalmologica Scandinavica1998-01-01+01:002008-01-01+01:00 75(2). p.181-3
Abstract

Reliability of patient performance in static computerized perimetry is important for evaluation of results. False positive answers tend to falsely increase measured threshold sensitivity. The frequency of false positive responses is traditionally measured by adding extra questions, catch trials, to the test. Catch trials are few and limited because of time constraints, leading to inexact estimates. We developed an improved method for estimation of false positive answers by using information already available in current ordinary computerized visual field testing, without increasing test time. We here describe the method and evaluate it in a prospectively collected material of 49 glaucoma eyes of 49 patients. The results show that the new... (More)

Reliability of patient performance in static computerized perimetry is important for evaluation of results. False positive answers tend to falsely increase measured threshold sensitivity. The frequency of false positive responses is traditionally measured by adding extra questions, catch trials, to the test. Catch trials are few and limited because of time constraints, leading to inexact estimates. We developed an improved method for estimation of false positive answers by using information already available in current ordinary computerized visual field testing, without increasing test time. We here describe the method and evaluate it in a prospectively collected material of 49 glaucoma eyes of 49 patients. The results show that the new method reduces measurement errors considerably and significantly as compared with the traditional catch trials method. Test-retest change was only half with the new method as compared to the traditional method of catch trials. Furthermore, it can reduce test time by eliminating the need to use catch trials to estimate the frequency of false positive responses.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Adult, Aged, Aged, 80 and over, Evaluation Studies as Topic, False Positive Reactions, Female, Glaucoma, Humans, Image Processing, Computer-Assisted, Male, Middle Aged, Predictive Value of Tests, Prospective Studies, Reproducibility of Results, Sensory Thresholds, Visual Field Tests, Visual Fields
in
Acta Ophthalmologica Scandinavica1998-01-01+01:002008-01-01+01:00
volume
75
issue
2
pages
3 pages
publisher
Wiley-Blackwell
external identifiers
  • Scopus:0030927853
ISSN
1395-3907
language
English
LU publication?
yes
id
f368e178-eda7-4749-a052-0abbb17bed72
date added to LUP
2016-08-30 17:10:43
date last changed
2016-09-16 08:55:32
@misc{f368e178-eda7-4749-a052-0abbb17bed72,
  abstract     = {<p>Reliability of patient performance in static computerized perimetry is important for evaluation of results. False positive answers tend to falsely increase measured threshold sensitivity. The frequency of false positive responses is traditionally measured by adding extra questions, catch trials, to the test. Catch trials are few and limited because of time constraints, leading to inexact estimates. We developed an improved method for estimation of false positive answers by using information already available in current ordinary computerized visual field testing, without increasing test time. We here describe the method and evaluate it in a prospectively collected material of 49 glaucoma eyes of 49 patients. The results show that the new method reduces measurement errors considerably and significantly as compared with the traditional catch trials method. Test-retest change was only half with the new method as compared to the traditional method of catch trials. Furthermore, it can reduce test time by eliminating the need to use catch trials to estimate the frequency of false positive responses.</p>},
  author       = {Olsson, J and Bengtsson, B and Heijl, A and Rootzén, H},
  issn         = {1395-3907},
  keyword      = {Adult,Aged,Aged, 80 and over,Evaluation Studies as Topic,False Positive Reactions,Female,Glaucoma,Humans,Image Processing, Computer-Assisted,Male,Middle Aged,Predictive Value of Tests,Prospective Studies,Reproducibility of Results,Sensory Thresholds,Visual Field Tests,Visual Fields},
  language     = {eng},
  number       = {2},
  pages        = {181--3},
  publisher    = {ARRAY(0x9011c10)},
  series       = {Acta Ophthalmologica Scandinavica1998-01-01+01:002008-01-01+01:00},
  title        = {An improved method to estimate frequency of false positive answers in computerized perimetry},
  volume       = {75},
  year         = {1997},
}