Syfte: Syftet med denna studie var att undersöka om en sfärisk endagars silikonhydrogel lins (clariti® 1day) vid sporadiska tillfällen kan ordineras istället för en torisk endagars silikonhydrogel lins (clariti® 1day toric) vid -0,75 DC i astigmatism. Metod: I studien undersöktes 26 personer varav 14 kunde delta. Deltagarnas ålder var mellan 18-40 år. Mätningarna genomfördes på 14 vänster ögon med astigmatism på  -0,75 DC. Kontaktlinserna som testades var clariti® 1day och clariti® 1day toric. Ett biomikroskop användes för att mäta inklinationen på linserna, undersöka central och korneal täckning samt passform och rörelse i olika led. Även undersökning med flouresecin och blått ljus utfördes på mätögat för att se om signifikanta stainings fanns(≥ grad 2). En ETDRS logMAR syntavla på 4 meters avstånd användes för att mäta hög (100%)  – och lågkontrast (10%). Resultat: Resultatet av denna studie visar ingen klinisk signifikant skillnad i visus dock blev det visusförändringar vid både hög – och lågkontrast mätningar. En förbättring med 0,08 logMAR (4 optotyper) påträffades med de toriska linserna jämfört med de sfäriska vid högkontrast visusmätningar samt 0,03 logMAR (1,5 optotyp) bättre med de toriska vid lågkontrast visusmätningar. Slutsats: Denna studie visar ingen klinisk signifikant skillnad i visus mellan clariti® 1day och clariti® 1day toric. Dock blev det visusförändringar med de toriska linserna vid både hög – och lågkontrast mätningar med 1,5-4 optotyper mer. / The purpose of this study was to determine whether there is a significant difference in visual acuity or not between a spherical one day silicone hydrogel lenses (clariti® 1day) and a toric one day silicone hydrogel lenses (clariti® 1day toric). The study was conducted with the help of an ETDRS logMAR chart, with a testing distance of 4 meters. Both high and low contrast visual acuity was examined. If no statistical significant difference is showed between these two lenses then clariti® 1day may be prescribed instead of clariti® 1day toric, in some infrequently occasion as short vacations. Toric lenses could be harder to find in stores then the spherical lenses, if needed right away. The toric lenses could also be more expensive than the spherical lenses. If clariti® 1day could be prescribed for some occasions and still be able to maintain a good visual acuity when using them, then it might be possible to prescribe them when needed right away. In this study overall 26 eyes were tested, out of which 12 were excluded in the inclusion criteria due to that the participants had more or less astigmatism than what was needed or they had the astigmatism in the right eye. A total of 14 left eyes were examined. Two of the participants were men and 12 were women. All the participants had a cylinder of -0.75 D in the left eye. The participant were first corrected with a clariti® 1day spherical lens using their spherical eqvivalent power and after that with a torical lens (clariti® 1day toric). Both high and low contrast visual acuity were measured monoculary with both lenses in a photopic lightning. The study showed that the visual acuity in both high and low contrast was 1,5-4 letters better with the torical lenses than with the spherical lenses, even with -0.75 D astigmatism. However in this study there is no statistical significant improvement in visual acuity at a cylinder of -0,75D in either high or low contrast visual acuity measurements. That could be due to a small amount of participants in this study.