Comparison between the Laser-Badal and Vernier Optometers.
Abstract
An optometer using polarized light and a vernier alignment task was built and compared with two laser-Badal optometers. The repeat reliability of the measurements of the optometers was assessed in a sample of student naval aviators. In addition, the vernier optometer measurements were made in the dark and in a lighted room to determine whether or not special lighting would be necessary for routine testing with the vernier optometer. The results showed that the vernier optometer was easier to use and more reliable than either of the two laser-Badal optometers. Discrepancies were found between it and that the other two optometers. A number of factors were identified in the vernier optometer that would give rise to the discrepancies. In light of the several advantages of the vernier optometer over the laser-Badal optometer, it is recommended that further work be done to improve its design. Keywords: Optometers; Dark focus; Dark vergence; Aviators; Dark adaptation. (jhd)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1988
- Accession Number
- ADA204393
Entities
People
- Leonard A. Temme
- William B. Cushman
Organizations
- Naval Aerospace Medical Research Laboratory