Trifocal IOL Visual Performance Quantification
Research type
Research Study
Full title
Technology Validation and Optimization for Trifocal Intra Ocular Lens Visual Performance Quantification
IRAS ID
254198
Contact name
Kishan Patel
Contact email
Sponsor organisation
OCULAR TECHNOLOGY GROUP - International
Duration of Study in the UK
0 years, 7 months, 24 days
Research summary
Trifocal intra-ocular lenses (lenses implanted inside the eye after cataract removal (i.e. IOL) have three different focus; one for far, one for intermediate and one for near viewing, so that the patient does not need to use reading glasses for close work. When testing how well the IOL corrects patient vision, in addition to distance vision, testing of vision at intermediate distance corresponding to computer screen and at near (corresponding to reading book and using smart phones and tablets must be included.
The standardised (ANSI Z80.7) vision testing method recommends testing at 66cm for intermediate viewing and at 40cm for near viewing using general room lighting condition to measure the vision with Trifocal IOL. The problem common to many studies that use the standardised method is that patient vision satisfaction do not match the visual acuity (VA) when the correction is not optimal . This is due to the fact that many parameters that affect the vision, such as the lighting conditions (brightness level), chart contrast and the time to complete the test, are not controlled.
The rationale for this study is that blur can affect near and intermediate vision of individuals who had IOL implants in a different manner depending upon the environment they are in (i.e. contrast, lighting, time). The aim of the study will be to evaluate the effect of different levels of blur/defocus on vision for those who had successful cataract surgery and were implanted with trifocal IOL, by measuring their intermediate and near vision using a comprehensive set of vision tests.
REC name
Yorkshire & The Humber - Leeds East Research Ethics Committee
REC reference
18/YH/0430
Date of REC Opinion
30 Oct 2018
REC opinion
Favourable Opinion