Optic disc diameter influences the ability to detect glaucomatous disc damage

Research output: Contribution to journalArticle

Abstract

We studied the influence of optic disc diameter on the diagnostic power of subjective disc evaluation of glaucoma. One hundred and thirteen colour disc photographs of 91 patients with primary open angle glaucoma and 174 photographs of 89 randomly selected normal subjects were studied. Five ophthalmologists independently classified all eyes as glaucomatous or normal by disc appearance using a masked forced choice design. Sensitivities and specificities varied strongly as a function of disc diameter. Overall sensitivity for recognizing glaucoma by disc inspection was 58% in small discs, 72% in the middle group and 85% in the group of large discs. These differences were significant, and the odds of recognizing a glaucomatous disc as such increased by a factor of 2.07 between each group. Overall specificity was 99.6% in small discs, 95% in the middle group, and 79% in large normal discs. Thus, larger discs were more likely to be classified as glaucomatous whether they were glaucomatous or not, while small discs were more likely to be classified as normal.

Details

Authors
Organisations
External organisations
  • Skåne University Hospital
  • Lund University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Ophthalmology

Keywords

  • Adult, Aged, Aged, 80 and over, Fundus Oculi, Glaucoma, Open-Angle/pathology, Humans, Image Processing, Computer-Assisted, Middle Aged, Optic Disk/pathology, Optic Nerve/pathology, Photography, Random Allocation, Reproducibility of Results, Sensitivity and Specificity
Original languageEnglish
Pages (from-to)122-9
Number of pages8
JournalActa Ophthalmologica
Volume71
Issue number1
Publication statusPublished - 1993 Feb
Publication categoryResearch
Peer-reviewedYes