Titre du document / Document title

The effect of optic disc size on diagnostic precision with the Heidelberg Retina Tomograph

Auteur(s) / Author(s)

IESTER M. ⁽¹⁾ ; MIKELBERG F. S. ⁽¹⁾ ; DRANCE S. M. ⁽¹⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Department of Ophthalmology-University of British Columbia, Vancouver, British Columbia, CANADA

Résumé / Abstract

Purpose: The authors evaluated the ability of a confocal scanning laser ophthalmoscope to detect glaucomatous visual field loss by using their previously described discriminant formula on a prospectively obtained cohort. The relationship of optic disc size to diagnostic classification was also evaluated. Methods: One eye was chosen randomly from each of 153 subjects. Sixty control eyes had intraocular pressure less than 21 mmHg and normal visual fields; 93 glaucomatous eyes had intraocular pressure greater than 21 mmHg and abnormal visual fields. The optic disc status purposely was not used for classification purposes. All subjects were examined with the Heidelberg Retina Tomograph (HRT; Heidelberg Engineering GMBH, Heidelberg, Germany) and Humphrey Perimeter, program 30-2 (Humphrey Instruments, Inc., San Leandro, CA). Visual fields were considered abnormal by the authors' previously published criteria. The HRT classification used age, adjusted cup shape measure, rim volume, and height variation contour to classify the optic disc as normal or glaucomatous. Then the authors assessed the sensitivity, specificity, and diagnostic precision for the entire group, and for three subsets classified by disc area: disc area less than 2 mm², between 2 and 3 mm², and more than 3 mm². Results: The entire group had a sensitivity, specificity, and diagnostic precision of 74%, 88%, and 80%, respectively. The specificity was 83% when disc area was less than 2 mm² and improved to 89% when disc area was more than 2 mm². The sensitivity tended to improve from 65% to 79%, and to 83% if the disc area increased, but the difference was not statistically significant. Conclusions: In a prospective cohort of patients, the HRT discriminant analysis formula was capable of detecting glaucomatous visual field loss with good precision. Unusually small optic discs continue to present diagnostic difficulties.

Revue / Journal Title

Ophthalmology   ISSN 0161-6420   CODEN OPHTDG 

Source / Source

1997, vol. 104, n^o3, pp. 545-548 (12 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, New York, NY, ETATS-UNIS  (1976) (Revue)

Mots-clés anglais / English Keywords

Glaucoma (eye) ; Deficiency ; Visual field ; Size ; Optical disk ; Ophthalmoscope ; Laser ; Diagnosis ; Accuracy ; Human ; Eye disease ; Visual field disease ;

Mots-clés français / French Keywords

Glaucome ; Déficit ; Champ visuel ; Taille ; Disque optique ; Ophtalmoscope ; Laser ; Diagnostic ; Précision ; Homme ; Oeil pathologie ; Champ visuel pathologie ;

Mots-clés espagnols / Spanish Keywords

Glaucoma (ojo) ; Déficiencia ; Campo visual ; Talla ; Disco óptico ; Oftalmoscopio ; Laser ; Diagnóstico ; Precisión ; Hombre ; Ojo patología ; Campo visual patología ;

Localisation / Location

INIST-CNRS, Cote INIST : 18914, 35400006495304.0330