זוית הלשכה הקדמית במכשירים שונים

מנחים: מר דוד מרקוב, פרופסור אריאלה גורדון- שאג 

Introduction

Glaucoma is one of the leading causes of irreversible blindness worldwide (Vidinova, et al., 2015). Angle closure glaucoma (ACG) refers to occlusion of the trabecular meshwork by the peripheral iris, obstructing aqueous outflow (Kanski & Bowling, 2011). Scheimpflug photography is a relatively new and non-invasive method for anterior chamber angle (ACA) assessment. The Sirius tomographer (CSO, Italy) uses a rotating Scheimpflug camera to measure the ACA (Ruiz et al.,2015). The VX 120 (Luneau, France) is a new instrument that uses a stationary Scheimpflug camera to measure the ACA. In this research we tested whether the two instruments (VX120 Vs. Sirius) are interchangeable in ACA measurement.

Methods

We recruited 55 healthy students (42 females, mean age: 24.62 ± 7.18 years old) at Hadassah Academic College to participate in the study. Every subject was examined three times with the Sirius and the VX120 in a random order by two different technicians. The average and standard deviation ACA was were calculated. Correlation test and Bland and Altman analysis (B&A) were used to assess agreement.

Results

A good correlation was found between the two instruments (r=0.73). However, the mean difference and the 95% limits of agreement (LoAs) were 0.15 ± 4.42, LoAs = 17.33 degrees, which is a clinically unacceptable disparity (Fredrik et al., 2013).

Conclusions

The Sirius and the VX120 are non-interchangeable in measuring the Anterior Chamber Angle.