A Comparative Study of Total Corneal Power Using a Ray Tracing Method Obtained from 3 Different Scheimpflug Camera Devices
Autor: | Qinmei Wang, Jinjin Yu, Wenjin Xu, Xiuhong Ye, Giacomo Savini, Jinhai Huang, Chao Pan, Yanjun Hua, Weina Tan |
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Rok vydání: | 2020 |
Předmět: |
Adult
Male medicine.medical_specialty genetic structures Scheimpflug principle Refraction Ocular law.invention Cornea Young Adult 03 medical and health sciences Ocular physiology 0302 clinical medicine law Ophthalmology Healthy volunteers Photography medicine Humans Prospective Studies Tomography 030304 developmental biology Mathematics 0303 health sciences Keratometer Healthy subjects Corneal Topography Reproducibility of Results Healthy Volunteers eye diseases Clinical Practice 030221 ophthalmology & optometry Female Ray tracing (graphics) sense organs |
Zdroj: | American Journal of Ophthalmology. 216:90-98 |
ISSN: | 0002-9394 |
DOI: | 10.1016/j.ajo.2020.03.037 |
Popis: | We sought to assess the agreement of ray-traced corneal power values by 3 Scheimpflug tomographers tp construct the corresponding arithmetic adjustment factor in comparison with an automated keratometer (IOLMaster) and a conventional Placido-based topographer (Allegro Topolyzer).Prospective reliability analysis.A total of 74 eyes from 74 healthy subjects who underwent corneal power measurements using Pentacam, Sirius, Galilei, IOLMaster, and Allegro Topolyzer were included. Ray-traced corneal power values, such as total corneal refractive power (TCRP), mean pupil power (MPP), total corneal power (TCP), mean keratometry (Km), and simulated keratometry (SimK) were recorded respectively and analyzed using one-way analysis of variance (ANOVA) and Bland-Altman plots.Among the 3 ray-traced corneal power values, TCRP and MPP did not differ significantly (P = 0.81), whereas TCP presented a slightly significant larger value (P0.001). Compared to Km or SimK, corneal power measurements by the ray tracing method exhibited significantly lower values (P0.001). Bland-Altman plots disclosed that the 3 Scheimpflug tomographers showed similar 95% limits of agreement after arithmetic adjustment compared with Km (-0.40 to 0.40 D, -0.39 to 0.39 D, and -0.35 to 0.34 D) or SimK (-0.50 to 0.51 D, -0.43 to 0.42 D, and -0.46 to 0.46 D).Ray-traced corneal power values obtained using 3 Scheimpflug tomographers with default diameter settings were similar, indicating that they could be used interchangeably in daily clinical practice. The 3 Scheimpflug tomographers were satisfactory in agreement after arithmetical adjustment compared with conventional automated keratometer or Placido-based topographer. |
Databáze: | OpenAIRE |
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