Stereo Acuity and Reconnaissance. Phase I: Development of a Precision Chromostereopsis Test and Test Equipment.
Abstract
A long focal length Badal optometer with a three-axis head positioner was designed, developed and used in investigations dealing with stereoscopic acuity and reconnaissance. The major effort was in the development of a precision chromostereopsis test, a short version of this same test and a foveal/parafoveal scan test. The Badal optometer provided the desired precision in the measurement of intervisual axes distance, interpupillary distance and intercorneal reflection distance with no convergence of the eyes and with specific accommodative distances. The more precise location of the intervisual axes distance was used to study the effect of decentered artificial and natural pupils. Decentering of 2 mm artificial pupils from the observer's intervisual axes distance modified the relative perceived distance of colored but not of achromatic stimuli. The direction but not the magnitude of the effect agreed with prior investigators. The natural pupil data were inconclusive in its support of decentration of the pupil or Stiles-Crawford maxima as a complete explanation for chromostereopsis. The precision (ARC) chromostereopsis test was found to be easy to administer and reliable, and resulted in chromostereopsis measurements ranging from 5 to 130 seconds of arc. Prediction of the effect of an individual's chromostereopsis on his stereoscopic performance with chromatic imagery was accurate to within + or - 5.5 arc seconds 68% of the time.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1977
- Accession Number
- ADA040450
Entities
People
- Charles D. Anderson
- Conrad L. Kraft
Organizations
- Boeing