Document Detail

A handheld open-field infant keratometer (an american ophthalmological society thesis).
MedLine Citation:
PMID:  21212850     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To design and evaluate a new infant keratometer that incorporates an unobstructed view of the infant with both eyes (open-field design).
METHODS: The design of the open-field infant keratometer is presented, and details of its construction are given. The design incorporates a single-ring keratoscope for measurement of corneal astigmatism over a 4-mm region of the cornea and includes a rectangular grid target concentric within the ring to allow for the study of higher-order aberrations of the eye. In order to calibrate the lens and imaging system, a novel telecentric test object was constructed and used. The system was bench calibrated against steel ball bearings of known dimensions and evaluated for accuracy while being used in handheld mode in a group of 16 adult cooperative subjects. It was then evaluated for testability in a group of 10 infants and toddlers.
RESULTS: Results indicate that while the device achieved the goal of creating an open-field instrument containing a single-ring keratoscope with a concentric grid array for the study of higher-order aberrations, additional work is required to establish better control of the vertex distance.
CONCLUSION: The handheld open-field infant keratometer demonstrates testability suitable for the study of infant corneal astigmatism. Use of collimated light sources in future iterations of the design must be incorporated in order to achieve the accuracy required for clinical investigation.
Joseph M Miller
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Transactions of the American Ophthalmological Society     Volume:  108     ISSN:  1545-6110     ISO Abbreviation:  Trans Am Ophthalmol Soc     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2011-01-07     Completed Date:  2011-05-19     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  7506106     Medline TA:  Trans Am Ophthalmol Soc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  77-95     Citation Subset:  IM    
Department of Ophthalmology and Vision Sciences, The Mel and Enid Zuckerman College of Public Health of The University of Arizona, Tucson, USA.
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MeSH Terms
Aberrometry / instrumentation
Astigmatism / diagnosis*
Cornea / pathology*
Corneal Wavefront Aberration
Diagnostic Techniques, Ophthalmological / instrumentation*
Equipment Design
Grant Support

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

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