Document Detail

Determination of the neuroretinal rim area using the horizontal and vertical disc and cup diameters.
MedLine Citation:
PMID:  8566824     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: This study evaluated whether the neuroretinal rim area can be calculated on the basis of the horizontal and vertical diameters of the optic disc and cup applying the formula of an ellipse. METHODS: Color stereo optic disc photographs of 587 normal subjects and 1193 patients with glaucoma were morphometrically examined. In a first method, the areas of the optic disc and cup were planimetrically measured and the area of the neuroretinal rim was determined as optic disc area minus cup area. In a second method, the optic disc and cup were assumed to have an elliptical shape. Their areas were calculated by applying the formula of an ellipse, taking into account their horizontal and vertical diameters. As in the first method, the rim area was then determined as disc area minus cup area. RESULTS: The values of the neuroretinal rim area as measured using the first method differed by 0.05 +/- 0.05 mm2 from the values as calculated by the second method. The average error was 2.8 +/- 2.9% for the normal group and 8.2 +/- 20.8% for the glaucoma patients. It increased with decreasing neuroretinal rim area and increasing mean visual field defect. CONCLUSIONS: For clinical purposes, the neuroretinal rim area can be determined on the basis of the horizontal and vertical diameters of the optic disc and cup. The horizontal and vertical disc and cup diameters being determinable upon ophthalmoscopy, this finding is important for the direct measurement of optic disc morphology during any ophthalmoscopic examination.
J B Jonas; D M Montgomery
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv für klinische und experimentelle Ophthalmologie     Volume:  233     ISSN:  0721-832X     ISO Abbreviation:  Graefes Arch. Clin. Exp. Ophthalmol.     Publication Date:  1995 Nov 
Date Detail:
Created Date:  1996-03-01     Completed Date:  1996-03-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8205248     Medline TA:  Graefes Arch Clin Exp Ophthalmol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  690-3     Citation Subset:  IM    
Department of Ophthalmology, University Eye Hospital, Erlangen, Germany.
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MeSH Terms
Aged, 80 and over
Child, Preschool
Fundus Oculi
Glaucoma / pathology*
Middle Aged
Ophthalmoscopy / methods
Optic Disk / pathology*
Optic Nerve / pathology*
Retina / pathology*

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