Changing Fixation from 1 to 6 requires 15 prism diopters of Positive Convergence.
Summary
Public domain reproduction of artwork in Getty Museum, free to use, no copyright restrictions image - Picryl description
Tags
american
keystone view co
underwood underwood
prism diopters
positive convergence
getty museum
ultra high resolution
high resolution
gelatin silver prints
photography
Date
1930
Source
J. Paul Getty Museum
Link
Copyright info
Digital image courtesy of the Getty's Open Content Program.