The Limiting Effects of Astigmatism on Visual Performance through Periscopes

Abstract

The performance of observers with various degrees of astigmatic error (ranging from 0 to +6D) was compared through the old and new periscopes. In daytime viewing, observers with 4D of astigmatism could see as well through the new 12 power periscope as observers with 2D (the present maximum allowed under Navy standards) could see through the old periscope. With the new 24 power periscope, observers with 6D of astigmatism did even better than 2D astigmats through the old periscope. Additional experiments showed that equivalent results are obtained with either gratings or ship silhouettes, and whether natural or unduced astigmats are the observers.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1979
Accession Number
ADA080017

Entities

People

  • A. P. Ryan
  • C. L. Schlichting
  • Joann S. Kinney
  • S. M. Luria

Organizations

  • Naval Submarine Medical Research Laboratory

Tags

Communities of Interest

  • Biomedical
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Astigmatism
  • Biomedical Research
  • Cognition
  • Contrast
  • Electro-Optics
  • Eye Diseases
  • Frequency
  • Optical Instruments
  • Optics
  • Orientation (Direction)
  • Perception
  • Sine Waves
  • Square Waves
  • Three Dimensional
  • Two Dimensional
  • Visual Acuity
  • Visual Defects

Readers

  • Computer Vision.
  • Educational Psychology
  • Marine Hydrodynamics