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Jämförelse mellan subjektiva och objektiva metoder för bedömning av synnervsutträdet
Linnaeus University, Faculty of Health and Life Sciences, Department of Medicine and Optometry.
2018 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Comparison of subjective and objective methods to estimate the cup-to-disc ratio (English)
Abstract [sv]

Syfte: Syftet med denna studie var att jämföra olika metoder för uppskattning av synnerven och gradering av cup/disk förhållandet.

Metod: 31 personer med friska ögon deltog i studien varav 25 kvinnor och 6 män. Undersökningen började med visuskontroll med hjälp av en log-MAR tavla. Därefter togs det bilder på synnerven på båda ögonen (med odilaterad pupill) med OCT som möjliggör en 3D visning av cupen och disken. Slutligen togs det bilder på synnerven via en funduskamera som visar en 2D bild. Fyra erfarna optiker fick bedöma 2D bilderna och gradera cup disk förhållandet subjektivt. Parametrarna som bedömdes var horisontell och vertikal cup/disk kvot, samt cup/disk area kvoten. Dessa parametrar jämfördes sedan med mätvärden som var uppskattade med hjälp av OCT maskinens program.

Resultat: Resultatet bestämdes med hjälp av ett parat t-test som visade en signifikant skillnad mellan den vertikala cup/disk kvoten (p<0,001) som var uppmätt och uppskattad av OCT och en funduskamera. Likadant för horisontell cup/disk kvoten och cup/disk area kvoten hittades det en signifikant skillnad (p <0,001) vid jämförelse av olika uppskattningsmetoderna. Optikernas cup/disk bedömning jämfördes och resultatet visade att bedömningarna inte var enade, då korrelationen var låg r <0,8.

Slutsats: Jämförelsen mellan de subjektiva och objektiva uppskattningarna av horisontell och vertikal cup/disk samt cup/disk area kvoten visade signifikant skillnad.

Abstract [en]

Aim: The aim of this study was to compare the different methods for estimating the optic nerve head and grading the cup-to-disc ratio.

Methods: In this study 31 subjects were included. The participants were aged between 19-32 years old and all of them had healthy eyes. An OCT was used to scan the optic nerve on both eyes and estimate the cup-to-disc ratio. The OCT scanning gives a 3D image of the optic nerve. Finally, the retina was photographed with a fundus camera, where the images were only 2D. Four experienced opticians graded the cup-to-disc ratio based on the 2D images. The parameters that got estimated were the horizontal and vertical cup-to-disc ratio, but even the cup-to-disc area ratio. Both subjective and objective parameters were compared to each other.

Results: A paired t-test was performed for the vertical cup-to-disc ratio that was both estimated by the graders and determined by the OCT; the t-test showed a statistically significant difference (p<0,001) between the two. Likewise, a paired t-test was performed for the horizontal cup-to-disc ratio and the cup-to-disc area ratio, which was graded by the opticians and determined by the OCT, and the results showed a significant difference (p<0,001).

The agreement between the graders were compared, and the correlation between the ratings of the cup-to-disc ratios was not high r<0,8.

Conclusion: The comparison between the subjective gradings from the opticians of the cup-to-disc ratio and the objective cup-to-disc parameters showed a significant difference.

Place, publisher, year, edition, pages
2018. , p. 24
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:lnu:diva-76068OAI: oai:DiVA.org:lnu-76068DiVA, id: diva2:1219773
Educational program
Optometry Programme, 180 credits
Supervisors
Examiners
Available from: 2018-06-25 Created: 2018-06-17 Last updated: 2018-06-25Bibliographically approved

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