Digitalized Videographic Measurement of Strabismic Angle.

Han, Sueng Han; Yoo, Tae Hwan; Lee, Jong Bok

Original Article

Journal of the Korean Ophthalmological Society 1998;39(4):740-745.
Published online April 1, 1998.

Digitalized Videographic Measurement of Strabismic Angle.

Sueng Han Han, Tae Hwan Yoo, Jong Bok Lee

The Institute of Vision Research, Department of Ophthalmology, College of Medicine, Yonsei University, Seoul, Korea.

디지털 방식을 이용한 사시각의 측정

한승한(Sueng Han Han),유태환(Tae Hwan Yoo),이종복(Jong Bok Lee)

Abstract

Current using strabismic angle measurement techniques require examiners experience and subjective decision. The accuracy between observers and intra-observer is limited by the minimum eye movement that the examiner can detect with naked eye. Horizontal strabismic angles with 35 comitant strabismus patients were measured using precise digital signals converted by digital frame grabber and image processing software in a 32 bit microcomputer. Strabismic angle calculated using digital method was compared with that of prism-cover method. The slope of the regression line was 1.1054; the Y-intercept was 1.3870PD. The coefficiency of variation to verify its reproducibility for measurements of total variability in 35 strabismic patients was 3.71%. The strabismic angle measurement with digital frame grabber seems to be relatively precise and clinical application will be available in measuring horizontal and vertical strabismic angel.

Key Words: Digital;reproducibility;Strabismic angle