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En jämförelse av två olika multifokala kontaktlinsdesigner och dess påverkan på den funktionella synen: En pilotstudie
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]

Syfte: Syftet med denna pilotstudie var att jämföra en center distance-design mot en center near-design på asfäriska multifokala kontaktlinser och se dess påverkan på den funktionella synen hos presbyoper. 

Metod: Totalt deltog 11 deltagare i åldrarna 45-55 år och genomgick mätningar av  synskärpa avstånd och nära, stereoseende avstånd och nära, kontrastkänslighet samt läshastighet. Testerna utfördes tre gånger, en gång med deltagarens refraktiva korrektion, en gång med center distance kontaktlinser och en gång med center near kontaktlinser i en randomiserad ordning. För testerna med normalfördelad data utfördes repeated measures ANOVA, och gällande testerna med icke normalfördelad data användes Friedmans non parametric ANOVA.

Resultat: Ingen statistisk skillnad kunde hittas mellan linsdesignerna i något av testerna. Varken vid testerna för den funktionella synen, eller vid tester för synskärpa. En statistisk signifikant skillnad (p<0,05)  hittades mellan linser och glasögonkorrektion vid tester för synskärpa, både vid avstånd och på nära håll, där en glasögonkorrektion gav bättre resultat. 

Slutsats: Denna studie kunde ej påvisa någon skillnad mellan en center distance-design och en center near-design på asfäriska multifokala kontaktlinser vid tester gällande den funktionella synen för presbyoper.

Abstract [en]

Aim: This pilot study aimed to compare a center distance design against a center near design for aspheric multifocal contact lenses and their performance regarding visual function in presbyopes

Method: 11 participants, between the age of 45-55, completed measurements in visual acuity for distance and near, stereoacuity for distance and near, contrast sensitivity and reading speed. These tests were performed three times, one time with spectacle correction, one time with a center distance contact lens design and a one time with a center near contact lens design in a randomized order. Regarding the tests with normally distributed data, a repeated measures ANOVA was conducted, and for the non-normally distributed data, a Friedman non parametric ANOVA was used.

Results: No statistical difference was found between the two lens designs in any of the tests regarding visual function or regarding visual acuity. A statistically significant difference was found (p<0,05) between spectacle correction and the two contact lenses regarding visual acuity for both distance and near, where a spectacle correction performed better.  

Conclusion: This study did not find any difference in the visual function in presbyopes between a center distance design and a center near design for aspheric multifocal contact lenses. 

Place, publisher, year, edition, pages
2023. , p. 38
Keywords [sv]
Multifokala kontaktlinser, Center Distance, Center Near, Kontrastkänslighet, Stereopsis, Läshastighet.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:lnu:diva-121663OAI: oai:DiVA.org:lnu-121663DiVA, id: diva2:1765538
Educational program
Optometry Programme, 180 credits
Supervisors
Examiners
Available from: 2023-06-22 Created: 2023-06-11 Last updated: 2023-06-22Bibliographically approved

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