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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Clinical and Experim...arrow_drop_down
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
Clinical and Experimental Optometry
Article . 1974 . Peer-reviewed
License: Wiley TDM
Data sources: Crossref
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Validation Testing of the Autocollimating Photokeratoscope*

Authors: Barry A. J. Clark;

Validation Testing of the Autocollimating Photokeratoscope*

Abstract

The principle of operation of the autocollimating photokeratoscope is described briefly. It is shown how spherical test surfaces can be used to provide a valid simulation of aspheric surfaces such as the human cornea, and several trials of the instrument using these methods are described. Some of the results are useable as corrections for systematic error. An actual aspheric surface was also tested to confirm the results obtained with spherical surfaces. Corneal topography can be measured with errors at the edge of the observed field of approximately 4 μm.

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
2
Average
Average
Average
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