Document Detail

Reproducibility of normal corneal power measurements with a keratometer, photokeratoscope, and video imaging system.
MedLine Citation:
PMID:  2322156     Owner:  NLM     Status:  MEDLINE    
To determine the reproducibility of currently available instruments for measuring corneal power, two investigators measured comparable locations on 18 normal human corneas using a keratometer (Bausch & Lomb, Rochester, NY), the Corneascope (Kera Corp, Santa Clara, Calif), and the Corneal Modeling System (Computed Anatomy Inc, New York, NY). (For the two keratoscopes, average powers around rings at comparable locations were used.) Comparisons made between instruments at the significance level of .05 indicated that the keratometer was more reproducible than the Corneal Modeling System and the Corneascope, and the Corneal Modeling System was more reproducible than the Corneascope. Of the 31 rings projected on the surface of each cornea by the Corneal Modeling System, rings 2 through 13 were read reasonably reproducibly in that 76% of the measurements on these rings differed by no more than 0.5 diopter. The Corneal Modeling System (software version 1.16) is 83% as reproducible as a keratometer reading at approximately the edge of the 3-mm central zone on normal human corneas and provides information about corneal topography in a more reproducible and visually useful manner than the other two instruments.
S B Hannush; S L Crawford; G O Waring; M C Gemmill; M J Lynn; A Nizam
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Archives of ophthalmology     Volume:  108     ISSN:  0003-9950     ISO Abbreviation:  Arch. Ophthalmol.     Publication Date:  1990 Apr 
Date Detail:
Created Date:  1990-05-10     Completed Date:  1990-05-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7706534     Medline TA:  Arch Ophthalmol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  539-44     Citation Subset:  AIM; IM    
Department of Ophthalmology, Emory University, Atlanta, GA 30322.
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MeSH Terms
Analysis of Variance
Cornea / anatomy & histology*,  physiology
Image Processing, Computer-Assisted
Middle Aged
Reproducibility of Results
Videotape Recording
Vision Tests / instrumentation*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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