The normal optic nerve head on Heidelberg Retina Tomograph II.

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dc.contributor.authorAgarwal, Harish Cen_US
dc.contributor.authorGulati, Vikasen_US
dc.contributor.authorSihota, Ramanjiten_US
dc.date.accessioned2003-03-19en_US
dc.date.accessioned2009-05-29T09:01:15Z
dc.date.available2003-03-19en_US
dc.date.available2009-05-29T09:01:15Z
dc.date.issued2003-03-19en_US
dc.description.abstractPURPOSE: To study the characteristics of the optic nerve head using a scanning laser ophthalmoscope, the Heidelberg Retina Tomograph II (HRT II), in a normal population and to determine the specificity of HRT II diagnostic indices in the study population. METHODS: The optic nerve heads from 275 consecutive, randomly selected normal subjects were imaged on HRT II. Stereometric parameters were studied with respect to baseline variables such as age, gender, refractive error and disc size. The stereometric parameters and the results of Moorfields regression analysis (MRA) and discriminant function analysis were recorded. RESULTS: The average disc size in the population under study was 2.34 +/- 0.47 mm2. Age and gender had no significant effect on stereometric parameters. Myopic discs were larger than hypermetropic discs. MRA had a specificity varying between 85.5% and 98.2% depending upon the criteria used to define an abnormal disc. The specificity of MRA decreased with increasing disc size. The RB (R Bathija) and FSM (F S Mikelberg) discriminant functions had specificities of 96.4% and 87.3% respectively. CONCLUSIONS: Estimation of stereometric parameters of a normal disc can be used to indicate an abnormal one. Moorfields regression analysis and discriminant functions have a high specificity in our normal population; however caution must be exercised in interpreting the results for a disc area larger than 3 mm2.en_US
dc.description.affiliationDr. Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, India. vikasgulati@hotmail.comen_US
dc.identifier.citationAgarwal HC, Gulati V, Sihota R. The normal optic nerve head on Heidelberg Retina Tomograph II. Indian Journal of Ophthalmology. 2003 Mar; 51(1): 25-33en_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/71130
dc.language.isoengen_US
dc.source.urihttps://www.ijo.inen_US
dc.subject.meshAdolescenten_US
dc.subject.meshAdulten_US
dc.subject.meshAgeden_US
dc.subject.meshChilden_US
dc.subject.meshChild, Preschoolen_US
dc.subject.meshFemaleen_US
dc.subject.meshHumansen_US
dc.subject.meshLasers --diagnostic useen_US
dc.subject.meshMaleen_US
dc.subject.meshMiddle Ageden_US
dc.subject.meshOphthalmoscopyen_US
dc.subject.meshOptic Disk --anatomy & histologyen_US
dc.subject.meshOptic Nerve --anatomy & histologyen_US
dc.subject.meshOptic Nerve Diseases --diagnosisen_US
dc.subject.meshTomographyen_US
dc.titleThe normal optic nerve head on Heidelberg Retina Tomograph II.en_US
dc.typeComparative Studyen_US
dc.typeJournal Articleen_US
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