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Visioffice Interpupillary & Segment Height Measurements Vs Traditional Methods

出版	Northeastern State University, 2015
URL	http://books.google.com.hk/books?id=ILzGswEACAAJ&hl=&source=gbs_api

註釋Purpose. Popularity of free-form lenses has increased the need for more precise positioning of spectacle lenses. The purpose of this study was to compare the comparability and repeatability of the Essilor Visioffice system's interpupillary (PD) and segment height measurements to gold standard methods. Methods. Thirty healthy optometry school participants were enrolled and measured. Investigators measured their binocular and monocular PDs by mm ruler and pupillometer. Their seg heights, for right eye only, were measured using a mm ruler. All measurements were then repeated using the Visioffice system. Measurements were repeated three times on all participants. For this study the corneal reflex pupillometer and mm ruler were considered the gold standard for PD measurements and seg height measurements, respectively. A standard, pre-adjusted frame was used on all patients. Results. Bland-Altman analysis of the binocular PD measurements found the mean of differences and 95% limits of agreement between the Visioffice and the pupillometer to be 0.07 +/- 1.12mm. The intra-class correlation coefficient (ICC), a measure of repeatability, was 0.99 for the monocular PD measurements using the Visioffice (OD, OS). They were 0.98 and 1.0 for the pupillometer, OD and OS respectively. There was not a statistically significant difference between seg height measurements by the Visioffice and mm ruler by paired t-testing (p=0.13). However, neither the Visioffice nor mm ruler provided highly repeatable measurements of seg height (ICC=0.35, ICC=0.77). Conclusion. The Visioffice is comparable to the gold standard in its ability to measure PD and was repeatable in its measurements of PD. For seg height measurements, there was not a significant difference between measurements by the Visioffice and gold standard mm ruler. However, because neither the Visioffice nor mm ruler provided repeatable measurements of seg height the Visioffice does not appear to be superior to traditional seg height measurements.