Are There Different Objective Fixation Disparity Values for Two Different Test Paradigms

University of Applied Sciences and Arts Northwestern Switzerland24 enrolled

Overview

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 Type

OBSERVATIONAL

Enrollment

Conditions

Vision Disparity

Interventions

different test paradigmsOTHER

Eligibility

Sex: ALLMin age: 17 YearsMax age: 40 YearsHealthy volunteers:

Medical Language ↔ Plain English

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

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.

Time frame: Through study completion, up to 10 months