MyDay Single Vision vs. MyDay Toric Centration
Research type
Research Study
Full title
MyDay Single Vision vs. MyDay Toric Non Dispensing Centration Pilot Study
IRAS ID
300441
Contact name
Ruchi Gupta
Contact email
Sponsor organisation
CooperVision International Limited
Duration of Study in the UK
0 years, 6 months, 25 days
Research summary
Contact lenses to achieve optimal visual performance need to be optimally centered over the pupil but contact lens position is influenced by the shape of the cornea, the centre of which is not the same as the centre of the pupil. Typically, contact lenses are slightly off centered from the pupil, which for complex optics such as multifocal contact lenses to correct distance and near vision in presbyopic wearers, affects vision quality.
The other contact lens characteristics that affects the fit is the contact lens geometry, which is either a spherical (to correct short or long sight) or a toric (to correct astigmatism). To date we have some information regarding the centration of spherical contact lenses but not toric contact lenses. Hence, the proposed study to produce initial data on the relative centration of the two types of contact lenses to understand whether studies specific to toric contact lenses are needed or if the data collected with spherical contact lenses is applicable.
The information is important as toric designs are planned to be combined with multifocal designs to correct presbyopia.REC name
East of England - Cambridge South Research Ethics Committee
REC reference
21/EE/0149
Date of REC Opinion
29 Jun 2021
REC opinion
Further Information Favourable Opinion