Letter Contrast Sensitivity Vision Measurement Evaluation
Research type
Research Study
Full title
Letter Contrast Sensitivity Testing Validation in a Young Presbyopic Phakic Population
IRAS ID
291587
Contact name
Michel Guillon
Contact email
Sponsor organisation
Cccular Technology Group - International
Duration of Study in the UK
0 years, 2 months, 28 days
Research summary
In clinical practice the level of vision is measured by reading black letters on a white background under bright light. This method does not represent the vision needs in everyday life when the contrast (e.g. print) is not 100% and the light is variable (e.g. low light night time). In clinical research we need to precisely measure vision under the full range of conditions present throughout the day otherwise we overestimate the performance of new modes of vision corrections (e. g. new spectacles, contact lenses or intra-ocular lenses).
Several tests, called Contrast Sensitivity (CS) tests measure vision using targets of different contrasts and so under daytime and night time light conditions. Most of the tests use complex patterns that the patients need to identify, these test are difficult for naïve observers and recently several tests have instead used letters of different contrasts instead of pattern.
The objective of the study is to identify how reliable and easy are the pattern vs. the letters tests in order to include the most suitable in future clinical studies needing precise vision measurement.
The study will involve the participants to be tested twice over a short period of time and the results of the two sets of measurements being compared: the test with the smallest difference will be considered the best.
The study will be carried out with presbyopic (people needing different distance and near vision correction) participants as most of the spectacles, contact lenses and intraocular lenses requiring precise vision measurement validation are in this group.REC name
East of England - Cambridge South Research Ethics Committee
REC reference
20/EE/0276
Date of REC Opinion
18 Jan 2021
REC opinion
Further Information Favourable Opinion