Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You and Your Team.

Learn More →

Quantitative Descriptors of Corneal Topography: A Clinical Study

Quantitative Descriptors of Corneal Topography: A Clinical Study Abstract • Quantitative descriptors of corneal topography determined by computerized algorithm and designed to augment the information derived from topographic maps were evaluated in a clinical study. The surface regularity index, a measure of central corneal optical quality, was highly correlated with best spectacle-corrected visual acuity (p = 0.80, P<.001). The relatively low correlation between the surface asymmetry index, a measure of central corneal asymmetry, and best spectacle-corrected visual acuity (p = 0.62, P<.005) suggests that corneal symmetry is a lesser but still important determinant of the optical performance of the anterior corneal surface. There was also a high correlation between factors determined from computer-generated orthogonal simulated keratometer values and clinical keratometry values (mean corneal power, total corneal cylinder, and the location of the steepest corneal meridian). The information derived from these algorithms has both clinical and research applications and can be incorporated into computer-assisted topographic analysis systems. References 1. Klyce SD. Computer-assisted corneal topography: high resolution graphic presentation and analysis of keratoscopy . Invest Ophthalmol Vis Sci . 1984;25:1426-1435. 2. Maguire LJ, Singer DE, Klyce SD. Graphic presentation of computer analyzed keratoscope photographs . Arch Ophthalmol . 1987;94:223-230.Crossref 3. Gormley DJ, Gersten M, Koplin RS, Lubkin V. Corneal modeling . Cornea . 1988;7:30-35.Crossref 4. Cohen KL, Tripoli NK, Noecker RJ. Prospective analysis of photokeratoscopy for arcuate keratotomy to reduce postkeratoplasty astigmatism . Refract Corneal Surg . 1989;5:388-393. 5. Dingeldein SA, Klyce SD, Wilson SE. Quantitative descriptors of corneal shape derived from computer-assisted analysis of photokeratographs . Refract Corneal Surg . 1989;5:372-378. 6. Klyce SD, Wilson SE, Pittman SD, Wang J. Estimation of potential visual acuity from corneal shape . Invest Ophthalmol Vis Sci . 1989;30 ( (suppl) ):218. 7. Ferris FL, Kassoff A, Brenick GH, Bailey I. New visual acuity charts for clinical research . Am J Ophthalmol . 1982;94:91-96. 8. Wilson SE, Wang J, Klyce SD. Quantification and mathematical analysis of photokeratoscope images. In: Schanzlin DJ, Robin J, eds. Corneal Topography. New York, NY: Springer-Verlag NY Inc. In press. 9. Klyce SD, Wilson SE. Methods of analysis of corneal topography . Refract Corneal Surg . 1989;5:368-371. 10. Dabezies OH, Holladay JT. Measurement of corneal curvature: keratometer (ophthalmometer) . In: Dabezies OH Jr, Cavanagh HD, Farris RL, Lemp MA, eds. Contact Lenses: The CLAO Guide to Basic Science and Clinical Practice . New York, NY: Grune & Stratton; 1986;17.1-17.29. 11. Dingeldein SA, Klyce SD. The topography of normal corneas . Am J Ophthalmol . 1989;107:512-518. 12. Maguire LJ, Bourne WM. Corneal topography of early keratoconus . Am J Ophthalmol . 1989;108:107-112. 13. Wilson SE, Lin DTC, Klyce SD. The topography of keratoconus . Cornea . 1991;10:2-8.Crossref 14. Rabinowitz YS, McDonnell PJ. Computer-assisted corneal topography in keratoconus . Refract Corneal Surg . 1989;5:400-408. 15. Wilson SE, Lin DTC, Klyce SD, Reidy JJ, Insler MS. Topographic changes in contact lens-induced warpage . Ophthalmology . 1990;97:734-744.Crossref 16. Dingeldein SA, Pittman SD, Wang J, Klyce SD. Analysis of corneal topographic data . Invest Ophthalmol Vis Sci . 1988;29( (suppl) ):389. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Ophthalmology American Medical Association

Quantitative Descriptors of Corneal Topography: A Clinical Study

Loading next page...
 
/lp/american-medical-association/quantitative-descriptors-of-corneal-topography-a-clinical-study-ivS05xuYml
Publisher
American Medical Association
Copyright
Copyright © 1991 American Medical Association. All Rights Reserved.
ISSN
0003-9950
eISSN
1538-3687
DOI
10.1001/archopht.1991.01080030051037
Publisher site
See Article on Publisher Site

Abstract

Abstract • Quantitative descriptors of corneal topography determined by computerized algorithm and designed to augment the information derived from topographic maps were evaluated in a clinical study. The surface regularity index, a measure of central corneal optical quality, was highly correlated with best spectacle-corrected visual acuity (p = 0.80, P<.001). The relatively low correlation between the surface asymmetry index, a measure of central corneal asymmetry, and best spectacle-corrected visual acuity (p = 0.62, P<.005) suggests that corneal symmetry is a lesser but still important determinant of the optical performance of the anterior corneal surface. There was also a high correlation between factors determined from computer-generated orthogonal simulated keratometer values and clinical keratometry values (mean corneal power, total corneal cylinder, and the location of the steepest corneal meridian). The information derived from these algorithms has both clinical and research applications and can be incorporated into computer-assisted topographic analysis systems. References 1. Klyce SD. Computer-assisted corneal topography: high resolution graphic presentation and analysis of keratoscopy . Invest Ophthalmol Vis Sci . 1984;25:1426-1435. 2. Maguire LJ, Singer DE, Klyce SD. Graphic presentation of computer analyzed keratoscope photographs . Arch Ophthalmol . 1987;94:223-230.Crossref 3. Gormley DJ, Gersten M, Koplin RS, Lubkin V. Corneal modeling . Cornea . 1988;7:30-35.Crossref 4. Cohen KL, Tripoli NK, Noecker RJ. Prospective analysis of photokeratoscopy for arcuate keratotomy to reduce postkeratoplasty astigmatism . Refract Corneal Surg . 1989;5:388-393. 5. Dingeldein SA, Klyce SD, Wilson SE. Quantitative descriptors of corneal shape derived from computer-assisted analysis of photokeratographs . Refract Corneal Surg . 1989;5:372-378. 6. Klyce SD, Wilson SE, Pittman SD, Wang J. Estimation of potential visual acuity from corneal shape . Invest Ophthalmol Vis Sci . 1989;30 ( (suppl) ):218. 7. Ferris FL, Kassoff A, Brenick GH, Bailey I. New visual acuity charts for clinical research . Am J Ophthalmol . 1982;94:91-96. 8. Wilson SE, Wang J, Klyce SD. Quantification and mathematical analysis of photokeratoscope images. In: Schanzlin DJ, Robin J, eds. Corneal Topography. New York, NY: Springer-Verlag NY Inc. In press. 9. Klyce SD, Wilson SE. Methods of analysis of corneal topography . Refract Corneal Surg . 1989;5:368-371. 10. Dabezies OH, Holladay JT. Measurement of corneal curvature: keratometer (ophthalmometer) . In: Dabezies OH Jr, Cavanagh HD, Farris RL, Lemp MA, eds. Contact Lenses: The CLAO Guide to Basic Science and Clinical Practice . New York, NY: Grune & Stratton; 1986;17.1-17.29. 11. Dingeldein SA, Klyce SD. The topography of normal corneas . Am J Ophthalmol . 1989;107:512-518. 12. Maguire LJ, Bourne WM. Corneal topography of early keratoconus . Am J Ophthalmol . 1989;108:107-112. 13. Wilson SE, Lin DTC, Klyce SD. The topography of keratoconus . Cornea . 1991;10:2-8.Crossref 14. Rabinowitz YS, McDonnell PJ. Computer-assisted corneal topography in keratoconus . Refract Corneal Surg . 1989;5:400-408. 15. Wilson SE, Lin DTC, Klyce SD, Reidy JJ, Insler MS. Topographic changes in contact lens-induced warpage . Ophthalmology . 1990;97:734-744.Crossref 16. Dingeldein SA, Pittman SD, Wang J, Klyce SD. Analysis of corneal topographic data . Invest Ophthalmol Vis Sci . 1988;29( (suppl) ):389.

Journal

Archives of OphthalmologyAmerican Medical Association

Published: Mar 1, 1991

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$499/year

Save searches from
Google Scholar,
PubMed

Create folders to
organize your research

Export folders, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month