Evaluating data acquisition and smoothing functions of currently available videokeratoscopes

Michael W Belin, C. D. Ratliff

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Purpose: To compare the accuracy of computerized videokeratography systems using identical, calibrated test objects. Setting. Lions Eye Institute, Albany, New York. Methods: We evaluated the accuracy and smoothing of raw data acquisition (axial solution) of seven commercially available videokeratoscopes: Alcon EyeMap, Computed Anatomy TMS, EyeSys CAS, Humphrey MasterVue, Topcon CM-1000, Optikon Keratron, and TechnoMed C-Scan. We used six calibrated test objects to simulate clinical settings: spherical, spherocylindrical, simulated myopic ablation, hyperopic ablation, and a simulated central island. Results: None of the systems accurately imaged all objects. Although all systems imaged spherical objects with reasonable accuracy, errors greater than 4.0 diopters (D) frequently occurred in the central 6.0 mm optical zone (maximum error 10.0 D). Sources of error included excessive raw data smoothing, inability to read large transitions, loss of accuracy in the periphery, and poor central coverage. Conclusion: The clinician should be aware of the potential limitations of corneal topography when making clinical decisions.

Original languageEnglish (US)
Pages (from-to)421-426
Number of pages6
JournalJournal of Cataract and Refractive Surgery
Volume22
Issue number4
StatePublished - 1996
Externally publishedYes

Fingerprint

Corneal Topography
Lions
Islands
Anatomy
Research Design
Clinical Decision-Making

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Evaluating data acquisition and smoothing functions of currently available videokeratoscopes. / Belin, Michael W; Ratliff, C. D.

In: Journal of Cataract and Refractive Surgery, Vol. 22, No. 4, 1996, p. 421-426.

Research output: Contribution to journalArticle

@article{112fa137d76046be95e317aa6f105ff3,
title = "Evaluating data acquisition and smoothing functions of currently available videokeratoscopes",
abstract = "Purpose: To compare the accuracy of computerized videokeratography systems using identical, calibrated test objects. Setting. Lions Eye Institute, Albany, New York. Methods: We evaluated the accuracy and smoothing of raw data acquisition (axial solution) of seven commercially available videokeratoscopes: Alcon EyeMap, Computed Anatomy TMS, EyeSys CAS, Humphrey MasterVue, Topcon CM-1000, Optikon Keratron, and TechnoMed C-Scan. We used six calibrated test objects to simulate clinical settings: spherical, spherocylindrical, simulated myopic ablation, hyperopic ablation, and a simulated central island. Results: None of the systems accurately imaged all objects. Although all systems imaged spherical objects with reasonable accuracy, errors greater than 4.0 diopters (D) frequently occurred in the central 6.0 mm optical zone (maximum error 10.0 D). Sources of error included excessive raw data smoothing, inability to read large transitions, loss of accuracy in the periphery, and poor central coverage. Conclusion: The clinician should be aware of the potential limitations of corneal topography when making clinical decisions.",
author = "Belin, {Michael W} and Ratliff, {C. D.}",
year = "1996",
language = "English (US)",
volume = "22",
pages = "421--426",
journal = "Journal of Cataract and Refractive Surgery",
issn = "0886-3350",
publisher = "Elsevier Inc.",
number = "4",

}

TY - JOUR

T1 - Evaluating data acquisition and smoothing functions of currently available videokeratoscopes

AU - Belin, Michael W

AU - Ratliff, C. D.

PY - 1996

Y1 - 1996

N2 - Purpose: To compare the accuracy of computerized videokeratography systems using identical, calibrated test objects. Setting. Lions Eye Institute, Albany, New York. Methods: We evaluated the accuracy and smoothing of raw data acquisition (axial solution) of seven commercially available videokeratoscopes: Alcon EyeMap, Computed Anatomy TMS, EyeSys CAS, Humphrey MasterVue, Topcon CM-1000, Optikon Keratron, and TechnoMed C-Scan. We used six calibrated test objects to simulate clinical settings: spherical, spherocylindrical, simulated myopic ablation, hyperopic ablation, and a simulated central island. Results: None of the systems accurately imaged all objects. Although all systems imaged spherical objects with reasonable accuracy, errors greater than 4.0 diopters (D) frequently occurred in the central 6.0 mm optical zone (maximum error 10.0 D). Sources of error included excessive raw data smoothing, inability to read large transitions, loss of accuracy in the periphery, and poor central coverage. Conclusion: The clinician should be aware of the potential limitations of corneal topography when making clinical decisions.

AB - Purpose: To compare the accuracy of computerized videokeratography systems using identical, calibrated test objects. Setting. Lions Eye Institute, Albany, New York. Methods: We evaluated the accuracy and smoothing of raw data acquisition (axial solution) of seven commercially available videokeratoscopes: Alcon EyeMap, Computed Anatomy TMS, EyeSys CAS, Humphrey MasterVue, Topcon CM-1000, Optikon Keratron, and TechnoMed C-Scan. We used six calibrated test objects to simulate clinical settings: spherical, spherocylindrical, simulated myopic ablation, hyperopic ablation, and a simulated central island. Results: None of the systems accurately imaged all objects. Although all systems imaged spherical objects with reasonable accuracy, errors greater than 4.0 diopters (D) frequently occurred in the central 6.0 mm optical zone (maximum error 10.0 D). Sources of error included excessive raw data smoothing, inability to read large transitions, loss of accuracy in the periphery, and poor central coverage. Conclusion: The clinician should be aware of the potential limitations of corneal topography when making clinical decisions.

UR - http://www.scopus.com/inward/record.url?scp=0029947418&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029947418&partnerID=8YFLogxK

M3 - Article

C2 - 8733844

AN - SCOPUS:0029947418

VL - 22

SP - 421

EP - 426

JO - Journal of Cataract and Refractive Surgery

JF - Journal of Cataract and Refractive Surgery

SN - 0886-3350

IS - 4

ER -