Contact Lenses Comfort and Wettability Diurnal Variation
Research type
Research Study
Full title
Spherical and Toric Contact Lenses Comfort and Wettability Diurnal Variation
IRAS ID
341662
Contact name
Michel Guillon
Contact email
Sponsor organisation
CooperVision International Limited
Duration of Study in the UK
0 years, 9 months, 1 days
Research summary
Habitual practice when fitting patients with low level of astigmatism with soft contact lenses is to fit them with spherical contact lenses correcting the average level of myopia (short sight) or hyperopia (long sight) ignoring the low level of astigmatism present. Such practice, whereas successful over many years doe not achieve optimal vision sharpness as shown in a recent study, particularly when lighting is low. A possible drawback of toric contact lenses that also correct astigmatism is that the geometry of their contact lens front surface is more irregular reportedly leading to less contact lens comfort due to the tear film having more difficulty to spread.
Because of the potential visual benefit of correcting astigmatism, before recommending that approach as a first choice it is important to understand how comfort vary between spherical and toric contact lenses , in particular towards the end of the day when contact lens comfort is poorest.
The rationale for the study is therefore to compare the comfort achieved with spherical contact lenses to that of toric contact lenses over a full wearing day and to measure how the tear film spreads over the contact lens as it is a significant factor controlling comfort.REC name
London - Surrey Borders Research Ethics Committee
REC reference
24/PR/0373
Date of REC Opinion
23 Apr 2024
REC opinion
Further Information Favourable Opinion