Combining central and peripheral videokeratoscope maps to investigate total corneal topography
Franklin, Ross J., Morelande, Mark R., Iskander, D. Robert, Collins, Michael J., & Davis, Brett A. (2006) Combining central and peripheral videokeratoscope maps to investigate total corneal topography. Eye and Contact Lens, 32(1), pp. 27-32.
Purpose. To extend the area of standard corneal topography maps, one central map is combined with six peripheral maps after correlating them in a custom written computer program.
Methods. The point corresponding to the vertex normal of the central map is found in each of the peripheral maps. Data from the peripheral maps can then be added on to the edges of the central map to create a topography map that extends from limbus to limbus horizontally and vertically.
Results. The average size of the combined maps from 15 subjects was 11.3 +/- 0.3 mm horizontally and 10.3 +/- 0.3 mm vertically, compared to 9.2 +/- 0.4 mm horizontally and 7.5 +/- 0.7 mm vertically for the standard single maps. These values represent an increase in surface area of approximately 70%.
Conclusions. The topography of the entire cornea can be represented by combining multiple measurements from a Placido videokeratoscope. Conic fits based on central topography data are a poor representation of the total corneal shape.
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|Item Type:||Journal Article|
|Additional Information:||Self-archiving of the author-version is not yet supported by this publisher. For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: Michael Collins (firstname.lastname@example.org)|
|Keywords:||corneal topography, peripheral cornea, videokeratoscope|
|Subjects:||Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Vision Science (111303)|
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Optical Technology (111302)
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health|
Current > Institutes > Institute of Health and Biomedical Innovation
|Copyright Owner:||Copyright 2006 Lippincott Williams & Wilkins|
|Deposited On:||10 Feb 2006|
|Last Modified:||29 Feb 2012 23:23|
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