A case of superior oblique myokymia observed by an image-analysis system.
Superior oblique myokymia is a microtremor of the eye that causes monocular torsional oscillopsia. A modified Harada-Ito procedure was used to treat a case of the disease in a 20-year-old woman. The authors used video-image analysis pre- and postoperatively to evaluate the effect of the surgery on abnormal torsional eye movements. This analysis revealed that before surgery, the abnormal torsional movement had a very regular cycle (duration of attack, 8.0 +/- 0.5 s; time interval between attacks, 18.7 +/- 3.2 s; n = 9). After the surgery, amplitude of the abnormal torsional eye movement was reduced, and the oscillopsia had subjectively improved, although the movement cycle remained unchanged. The authors' video-image analysis, which used iris striation, proved to be a useful method for clinical measurement of torsional eye movements.
Hayakawa
Y
Y
Department of Ophthalmology, Niigata University School of Medicine, Japan.
Takagi
M
M
Hasebe
H
H
Hasegawa
S
S
Takada
R
R
Usui
T
T
Abe
H
H
Shibasaki
K
K
Yaoeda
H
H
Ukai
K
K
Ishikawa
N
N
D000328:Adult; D005133:Eye Movements; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D020385:Myokymia / Q000175:diagnosis* / Q000473:pathology; D015835:Ocular Motility Disorders / Q000175:diagnosis* / Q000601:surgery; D009801:Oculomotor Muscles / Q000473:pathology* / Q000601:surgery; D013508:Ophthalmologic Surgical Procedures; D014102:Torsion Abnormality / Q000175:diagnosis / Q000601:surgery