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OBJECTIVE We attempted to apply a newly developed image-analysis system for measurement and analysis of nystagmus. METHODS Eye movements were recorded by digital video through a head-mounted charge coupled device (CCD) camera. The recorded movie was converted into black and white in order to detect the area of the pupil. Horizontal and vertical eye positions were determined by calculating the centroid of the pupil. Torsional angle was calculated using the iris striate pattern around the pupillary margin. RESULTS The parameters (amplitude, cycle, etc.) of nystagmus were calculated easily by the new image-analysis system from the recorded images. As examples, the foveation period was measured accurately in a case of jerky-type congenital nystagmus. Very regular cycles of intorsional attack period were revealed in a case of superior oblique myokymia. A case of cork-screw-like nystagmus showed a characteristic combination of large and small cycles unassociated with torsion. CONCLUSIONS This image-analysis system was useful for quantitative analysis of nystagmus, and especially for measurement of torsion. Detailed waveforms and specific rhythms of nystagmus, which could not be recognized by observation, were demonstrated by this system.
Y Hayakawa, and
K Ukai, and
M Takagi, and
A Shiratori, and
N Ishikawa, and
H Hasebe, and
R Takada, and
T Usui, and
S Hasegawa, and
H Abe
April 2016,
Beijing da xue xue bao. Yi xue ban = Journal of Peking University. Health sciences,
Y Hayakawa, and
K Ukai, and
M Takagi, and
A Shiratori, and
N Ishikawa, and
H Hasebe, and
R Takada, and
T Usui, and
S Hasegawa, and
H Abe
August 1988,
Clinical orthopaedics and related research,
Y Hayakawa, and
K Ukai, and
M Takagi, and
A Shiratori, and
N Ishikawa, and
H Hasebe, and
R Takada, and
T Usui, and
S Hasegawa, and
H Abe
July 2003,
European journal of medical research,
Y Hayakawa, and
K Ukai, and
M Takagi, and
A Shiratori, and
N Ishikawa, and
H Hasebe, and
R Takada, and
T Usui, and
S Hasegawa, and
H Abe
October 1972,
Computers and biomedical research, an international journal,
Y Hayakawa, and
K Ukai, and
M Takagi, and
A Shiratori, and
N Ishikawa, and
H Hasebe, and
R Takada, and
T Usui, and
S Hasegawa, and
H Abe
January 2010,
Proceedings. International Conference on Image Processing,
Y Hayakawa, and
K Ukai, and
M Takagi, and
A Shiratori, and
N Ishikawa, and
H Hasebe, and
R Takada, and
T Usui, and
S Hasegawa, and
H Abe
November 1988,
Journal of neuroscience methods,
Y Hayakawa, and
K Ukai, and
M Takagi, and
A Shiratori, and
N Ishikawa, and
H Hasebe, and
R Takada, and
T Usui, and
S Hasegawa, and
H Abe
January 1993,
Life sciences,
Y Hayakawa, and
K Ukai, and
M Takagi, and
A Shiratori, and
N Ishikawa, and
H Hasebe, and
R Takada, and
T Usui, and
S Hasegawa, and
H Abe
January 1998,
Quintessence international (Berlin, Germany : 1985),
Y Hayakawa, and
K Ukai, and
M Takagi, and
A Shiratori, and
N Ishikawa, and
H Hasebe, and
R Takada, and
T Usui, and
S Hasegawa, and
H Abe
January 1992,
Ophthalmic research,
Y Hayakawa, and
K Ukai, and
M Takagi, and
A Shiratori, and
N Ishikawa, and
H Hasebe, and
R Takada, and
T Usui, and
S Hasegawa, and
H Abe
September 1987,
Medical & biological engineering & computing,
