Visual and Functional Assessment in Low Vision Patients
Vision testing is a fundamental part of every optometry and ophthalmology assessment. Traditional vision testing charts are not able to measure vision below a certain level. Vision in this range is classified as counting fingers (CF), hand movements (HM) and light perception (LP). These measures are not very accurate or easily quantifiable. They are also poorly understood in terms of impact on quality of life. This study aims to assess new methods for measuring the vision of patients with very low vision.
Age-related Macular Degeneration
Optic Nerve Pathology
Inherited Retinal Dystrophies
|Study Design:||Observational Model: Case-Crossover
Time Perspective: Prospective
|Official Title:||A Randomised Crossover Study to Assess the Usability of Two New Vision Tests in Patients With Low Vision, and Relationship of the Measures to Daily Living Tasks.|
- Comparison of VA measured with FrACT and BRVT vision tests [ Time Frame: Single visit ] [ Designated as safety issue: No ]
- Relationship between VA and ability to carry out daily living tasks. [ Time Frame: Single time point ] [ Designated as safety issue: No ]Results from a daily living skills survey will be related to VA measured by FrACT testing.
|Study Start Date:||June 2013|
|Estimated Study Completion Date:||December 2016|
|Estimated Primary Completion Date:||August 2016 (Final data collection date for primary outcome measure)|
Order of vision tests 1
Undergo testing with BRVT first, FrACT second.
Order of vision tests 2
Undergo testing with FrACT first, BRVT second.
Assessing very low vision accurately is becoming increasingly important with the increase in research in this area, such as using retinal implants to restore vision. Without being able to accurately measure the change in vision before and after treatment, it is not possible to fully assess the effect of treatment.
The Freiburg Vision Test (FrACT) is a computer based test developed to assess patients down to the LP level. It has been used in research in recent years. The FrACT is suitable for research but is not suitable for a clinical setting. The Berkeley Rudimentary Vision Test (BRVT) works on a similar principal as the FrACT but consists of hand held cards shown to the patient. Little work has been completed on how well the BRVT test works. Results from FrACT and BRVT will be compared in a group of patients with very low vision. This is important to establish how easily research results can be applied to a clinical setting.
Patients will also be asked to complete a daily living survey to better understand the impact of such poor vision on the ability to carry out day to day tasks. This understanding will help guide low vision services for patients as well as help direct low vision research to achieve a useful level of functional vision.
Please refer to this study by its ClinicalTrials.gov identifier: NCT01876147
|Oxford University Hospitals NHS Trust||Recruiting|
|Oxford, Oxfordshire, United Kingdom, OX3 9DU|
|Contact: Jasleen K Jolly, MSc firstname.lastname@example.org|
|Principal Investigator: Robert E MacLaren, MB ChB DPhil|
|Sub-Investigator: Jasleen K Jolly, MSc|
|Principal Investigator:||Robert E MacLaren, DPhil||University of Oxford|