Clinical Trial: Visual and Functional Assessment in Low Vision Patients
Study Status: Active, not recruiting
Recruit Status: Active, not recruiting
Study Type: Observational
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.
Brief Summary: 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.
Detailed Summary:
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.
Sponsor: University of Oxford
Current Primary Outcome: Comparison of VA measured with FrACT and BRVT vision tests [ Time Frame: Single visit ]
Original Primary Outcome: Same as current
Current Secondary Outcome: Relationship between VA and ability to carry out daily living tasks. [ Time Frame: Single time point ]
Original Secondary Outcome: Relationship between VA and abililty to carry out daily living tasks. [ Time Frame: Single time point ]
Information By: University of Oxford
Dates:
Date Received: June 10, 2013
Date Started: June 2013
Date Completion: December 2016
Last Updated: March 16, 2016
Last Verified: March 2016
