Pupil Recovery Versus Bandwidth/Intensity of the Visible Spectrum.
Abstract
This research experiment was performed to investigate possible differences in pupil recovery times as the result of a light stimulus of separate visible bandwidths and intensities of the electromagnetic spectrum. An experiment was designed using dual intensity (10 and 20 foot candles) light of three separate bandwidths of the visible spectrum to measure the time of 50% pupil recovery from a constricted state. Twelve caucasian males with uncorrected normal vision were chosen as subjects for this experiment. Subjects were dark adapted to a very low (less than one foot candle) red (approximately 700 nm) light source. The pupil constriction-dilation sequence was initiated by a projected light of one of the two intensities and bandwidths of either 400-425 nm (blue), 500-520 nm (green), or 650-700 nm (red). This procedure provided 72 data points from a three variable-two level, randomized block factorial-fixed effect design. The parameter or data point of interest was the time of pupil recovery to a 50% redilation level following constriction. The data point was taken from measurements of pupil movement recorded on a series 800 Space Sciences TV Pupillometer. Conclusions drawn from the analysis are as follows: (1) The wavelength of a light stimulus affects pupil recovery times. (2) Higher intensities of a given wavelength light causes faster pupil recovery times. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1975
- Accession Number
- ADA020502
Entities
People
- Brian W. Durtschi
Organizations
- United States Army Materiel Command