Static ocular counterroll: video-based analysis after minimizing the false-torsion factors.
Jpn J Ophthalmol
; 49(6): 497-504, 2005.
Article
en En
| MEDLINE
| ID: mdl-16365796
ABSTRACT
PURPOSE:
To determine the validity and usefulness of a newly developed measurement method of static ocular counterrolling (s-OCR) that eliminates false-torsion factors and to test the Jampel hypothesis that s-OCR does not exist.METHODS:
A lightweight measurement device, consisting of a video camera, a coaxial light source, and a laser pointer projecting a fixation target on the wall, was fixed to a subject's head by means of a mouthpiece. In 11 healthy adults (mean age 30 +/- 15 years), digital images of the right eye were captured while the subject kept his head tilted at a randomly selected angle ranging from 0 degrees to 50 degrees . By a frame-by-frame analysis of movements of the corneal light reflex and the iris patterns, OCR was evaluated.RESULTS:
Torsional eye movement in the opposite direction to head tilt was found in all subjects. The amount of torsion continuously increased until the head-tilt angle reached 40 degrees. The average (+/- SD) amplitude of a fitted sine curve was 7.6 +/- 3.2 degrees (range 4.3 degrees-10.3 degrees), and the individual amplitude was significantly larger than the test-retest repeatability of the measurement (+/-1.7 degrees).CONCLUSIONS:
The measurement method used in this study provided good test-retest repeatability and ease of application. The characteristics of torsional eye movements that we observed after minimizing the false-torsion factors agree with previous reports supporting the existence of s-OCR.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Postura
/
Convergencia Ocular
/
Movimientos de la Cabeza
/
Percepción de Profundidad
Límite:
Adult
/
Humans
Idioma:
En
Revista:
Jpn J Ophthalmol
Año:
2005
Tipo del documento:
Article
País de afiliación:
Japón