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Påverkan av blåljusfiltrerande kontaktlinser på visuella funktioner.
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
The impact of bluelight filtering contact lens on visual functions. (English)
Abstract [sv]

Syfte:  Syftet med studien var att bedöma om en blåljusfiltrerande kontaktlins har en påverkan på visus, kontrastkänslighet och färgseende och om det skiljer sig från en normaltonad kontaktlins.

Metod: 29 emmetropa personer med frisk okulär hälsa deltog i studien. Varje deltagare testade två linstyper, varav en blåljusfiltrerande kontaktlins med en gul färg och en konventionell kontaktlins med en lätt hanteringsfärg. Visuella funktioner så som visus, kontrastkänslighet, färgseende bedömdes utan kontaktlins samt med de två linstyperna. De visuella funktionerna undersöktes med Metropsis System (Cambridge Research system) och analyserades med repeated measures ANOVA. Testerna utfördes binokulärt i ett mörkt rum.

Resultat:  Visus visade ingen signifikant skillnad mellan de tre förhållandena. Den blåljusfiltrerande kontaktlinsen visade en reducering med en bokstav på visus, dock var inte denna skillnaden statistiskt signifikant (p=0,181). Kontrastkänsligheten för fem spatiala frekvenser var lika för de två kontaktlinserna. Dock visade utan kontaktlins ge en signifikant skillnad i kontrastkänslighet i jämförelse till de två kontaktlinserna (p<0,05). Färgseendet visade ingen signifikant skillnad mellan de två linserna (p=0,117)

Slutsats Studien visade att den blåljusfiltrerande kontaktlinsen inte hade någon påverkan på visus, kontrastseende och färgseende till skillnad från en normaltonad kontaktlins. De visuella funktionerna för den blåljusfiltrerande kontaktlinsen var likadan som för den normaltonade kontaktlinsen och skulle kunna användas som ett alternativ till den normaltonade kontaktlinsen om den skyddar ögonen mot det kortvågiga, blåa ljuset.

Abstract [en]

The aim of this study was to evaluate if blue-light filtering contact lens has any impact on visual acuity, contrast sensitivity and colour perception and if the findings are different from a normal tinted contact lens.

Twenty nine emmetropic subjects without any ocular health problems were included in the study. Each subject tested two types of contact lenses, one was a conventional contact lens with a normal handling tint, and the other was a blue-light filtering lens with a yellow tint. Visual functions such as visual acuity, contrast sensitivity, colour vision were evaluated without any lenses and then with these two contact lenses. The visual function measurments were done with the Metropsis system (Cambridge Research System) and the results were analyzed with repeated measures ANOVA. The visual function tests was performed binocularly in a dark room.

Visual acuity showed no significant difference between the three conditions. There was a slight reduction of visual acuity with the blue-light filtering contact lens but this difference was not statistically significant (p = 0.181). The contrast sensitivity function across five different spatial frequencys were similar in both normal tinted and blue light filtering contact lenses. However, the unaided contrast sensitivity was significantly better than the contrast sensitivity obtained with the two contact lenses (p<0.05). Colour vision showed no significant difference between these two lenses (p=0.117).

This study showed that the blue-light filtering contact lens did not have any effect on visual functions such as visual acuity, contast sensitivity and colour vision. The visual functions for the blue-light filtering contact lens were similar to the normal tinted contact lens. The blue-light filtering contact lens can be used as an alternative to the normal tinted contact lens if they have an added benefit of protecting the eye from the blue-light.

Place, publisher, year, edition, pages
2018. , p. 25
Keywords [sv]
Blåljusfiltrerande kontaktlins, Kontrastkänslighet, Färgseende, Visus
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:lnu:diva-75905OAI: oai:DiVA.org:lnu-75905DiVA, id: diva2:1218538
External cooperation
Star-Lens AB
Subject / course
Optometry
Educational program
Optometry Programme, 180 credits
Supervisors
Examiners
Available from: 2018-06-17 Created: 2018-06-14 Last updated: 2018-06-17Bibliographically approved

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