VISUAL RECOVERY FROM BRIEF EXPOSURES TO VERY HIGH LUMINANCE LEVELS
Abstract
The design and calibration of the apparatus for delivering brief, high-intensity flashes from a xenon-filled flash tube are described. A maximum field luminance of 4.4 x 10 to the 5th power L. was provided by the flash tube seen by Maxwellian view. A rotating mirror was synchronized with the flash tube discharge to produce exposure durations from 42 micro sec. to 1.4 msec. Field sizes could be varied from a point source to 10 degrees and an adapting field optical system allowed the subject to be pre adapted to various luminance levels before the flash was received. The criterion measure for recovery times following the flash was the correct identification of Sloan-Snellen test letters. Five different letter sizes were provided subtending visual angles from 41.9 to 10.2 minutes of arc. Some data are reported for five exposure durations of the flash and for five field sizes for the 20.3 minutes of arc test letter at a luminance of 0.0666 mL.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1964
- Accession Number
- AD0449479
Entities
People
- Glenn A. Fry
- Norma D. Miller
Organizations
- Ohio State University