Are There Different Objective Fixation Disparity Values for Two Different Test Paradigms: Similar to Reading Dot Presentation and Text Reading? - How This Phenomenon Can be Explained
Trial Snapshot
- Phase
- Not Applicable
- Status
- Completed
- Enrollment
- 24
- Primary Endpoint
- Fixation disparity in arcMin during a reading and reading related dot paradigm
Study Overview
Brief Summary
In optometry, binocular coordination is measured subjectively. The result is subjective fixation disparity. In research different experiments have proven, that subjective and objective fixation disparity are different. A binocular eyetracker has to be calibrated. There are two well known calibration methods: associated and dissociated calibration. Objective fixation disparity is measured in arcMin. Therefore, the precision of the eyetracker plays a crucial role. Now, the investigators try to compare dissociated calibration with polarized filters and associated calibration under different test paradigms.
Study Design
- Study Type
- Observational
- Observational Model
- Cohort
- Time Perspective
- Cross Sectional
Eligibility Criteria
- Ages
- 17 Years to 40 Years (Child, Adult)
- Sex
- All
- Accepts Healthy Volunteers
- Yes
Inclusion Criteria
- •VA without glasses/contact lenses 0.63
- •Accurate accommodation on 57cm
Exclusion Criteria
- •Tiredness at day of investigation
- •Presbyopia
- •Alcohol or drug abuse
- •No eye related pathology
- •No strabism
- •No known epilepsy-attack in family
Outcomes
Primary Outcomes
Fixation disparity in arcMin during a reading and reading related dot paradigm
Time Frame: Through study completion, up to 10 months
With an eyetracker fixation disparity will be measured on an objective way. The scale will be arcMin and test paradigm a reading tast and a dot task, similar to reading.
Secondary Outcomes
No secondary outcomes reported
Investigators
Remo Poffa
M.Sc Vision Science (Optometry)
University of Applied Sciences and Arts Northwestern Switzerland