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Jämförelse av korneal astigmatism uppmätt med olika kliniska instrument
Linnaeus University, Faculty of Health and Life Sciences, Department of Medicine and Optometry.
Linnaeus University, Faculty of Health and Life Sciences, Department of Medicine and Optometry.
2023 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

Bakgrund

Kornea är det högsta brytande mediet i ögat där små skillnader i dess form kan ändra brytkraften vilket leder till kornealastigmatism. Detta är viktigt att kunna mäta för synkorrektion och behandling av sjukdomstillstånd. 

 

Syfte

Syftet med studien var att undersöka repeterbarhet och jämförbarhet för de tre instrumenten Essilor WAM700+, Topcon TRK-2P och CSO/BON Sirius gällande kornealastigmatism.

 

Metod

Denna kvantitativa tvärsnittsstudie hade bara ett urvalskriterie vilket var att deltagarna skulle vara utan kända patologiska ögontillstånd. Minst tre mätningar per deltagare utfördes per instrument utefter ett framtaget protokoll.

 

Resultat

Majoriteten av de 64 personer som undersöktes var <50 år och 122 ögon ingick i analyserna då några uteslöts p.g.a. inkompletta resultat. Det fanns inga signifikanta skillnader mellan instrument gällande J180 och Power scalar-komponenter, däremot fanns en signifikant skillnad för J45-komponenten. ICC-värdena för samtliga datagrupper blev >0,90, vilket visar på hög repeterbarhet. CR hamnade för P-komponenten på ~0,50DC för samtliga instrument.

 

Slutsats

Resultaten av denna studie visar att vid fallet av friska ögon krävs mer än en mätning för att undersöka kornealastigmatism. Skillnaden mellan instrumenten i studien är bara kliniskt signifikant vid sned astigmatism.

Abstract [en]

Introduction

Cornea is the medium with the highest power of refraction in the eye. This means that small differences in the curvature affects the refractive power which can lead to corneal astigmatism. Measuring of corneal astigmatism is essential in some cases for finding the correct prescription and treatment of corneal dystrophies.

Purpose

The purpose of this study was to examine the repeatability and comparability of Essilor WAM700+, Topcon TRK-2P and CSO/BON Sirius when it comes to corneal astigmatism.

Methods

This quantitative, cross-sectional study’s only exclusion criteria was that the participants did not have any known pathological eye conditions. At least three measurements were made per participant per machine according to a protocol.

 

Results

The majority of the 64 patients in the study were <50 years of age. In total 122 eyes were used in analysis after the exclusion of cases with incomplete data. No significant difference was found for either the J180 or the power scalar component, whereas the J45-compontent showed a significant difference. The ICC-values for all data groups were calculated to >0,90 which means the repeatability is good. The CR for P in all instruments was calculated to ~0,50DC. 

 

Conclusion

The results of this study shows that, in healthy eyes, more than one measurement is necessary in measuring corneal astigmatism. The differences found between the instruments are only clinically significant for oblique astigmatism. 

Place, publisher, year, edition, pages
2023. , p. 24
Keywords [sv]
kornealastigmatism, topografi, keratometri, keratoconus
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:lnu:diva-121517OAI: oai:DiVA.org:lnu-121517DiVA, id: diva2:1764354
Subject / course
Optometry
Educational program
Optometry Programme, 180 credits
Supervisors
Examiners
Available from: 2023-06-19 Created: 2023-06-08 Last updated: 2023-06-19Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • nn-NB
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  • Other locale
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