Slit lamp-simulated oblique flashlight test in the detection of narrow angles in Chinese eyes: The Liwan eye study

Abstract

PURPOSE. To assess a modified slit lamp-simulated oblique flashlight test in the identification of persons with suspected angle closure. METHODS. Standard oblique flashlight test (SOFT) and a modified slit lamp-simulated flashlight test (SSFT) were performed on participants identified as primary angle closure suspects and controls from a population-based study. SOFT graded the iris shadow on the nasal iris as shallow, medium, and deep. SSFT measured the length of iris shadow and corneal diameter by a slit lamp graticule eyepiece after standardizing the illumination parallel to the iris plane. RESULTS. SOFT yielded sensitivity and specificity of 76.3% and 80.7% for the detection of eyes with ..