Effect of CL Parameters and Material on CL Fitting
Research type
Research Study
Full title
The Effect of Contact Lens Parameters and Material on Fitting Characteristics – Pilot Study
IRAS ID
281961
Contact name
Michel Guillon
Contact email
Sponsor organisation
CooperVision, Inc.
ISRCTN Number
ISRCTN16821484
Duration of Study in the UK
0 years, 6 months, 27 days
Research summary
Contact lens parameters are key in controlling mechanical performance (movement and centration), which in turn influences comfort. For multifocal contact lenses, due to the variable optic presented in front of the pupil, an optimal mechanical performance is essential in ensuring good vision and better clinical acceptance. The criteria are a stable fit (smallest acceptable movement) and good centration (minimal displacement of the contact lens centre with reference to the pupil centre).
To date there are two different edge designs; described as a chisel edge design and feather edge design. Hence, for multifocal contact lenses it is important to select the edge design that delivers the best performance as limited information is available on the comparison of the edge design in presbyopic population.
The rationale for the proposed study is, therefore, to characterise on a presbyopic population the effect of different edge designs and different material properties on mechanical performance of contact lenses.REC name
North West - Preston Research Ethics Committee
REC reference
20/NW/0201
Date of REC Opinion
4 May 2020
REC opinion
Further Information Favourable Opinion