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Titolo:
QUANTITATIVE ASSESSMENT OF FIXATIONAL EYE-MOVEMENTS BY SCANNING LASEROPHTHALMOSCOPY
Autore:
MOLLER F; SJOLIE AK; TEK T;
Indirizzi:
AARHUS UNIV HOSP,DEPT OPHTHALMOL DK-8000 AARHUS C DENMARK ODENSE UNIV HOSP,DEPT OPHTHALMOL DK-5000 ODENSE DENMARK
Titolo Testata:
Acta ophthalmologica Scandinavica
fascicolo: 6, volume: 74, anno: 1996,
pagine: 578 - 583
SICI:
1395-3907(1996)74:6<578:QAOFEB>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Keywords:
SACCADIC EYE MOVEMENTS; SCANNING LASER OPHTHALMOSCOPY; FIXATION; OPTICAL MODEL; RETINAL FUNCTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
F. Moller et al., "QUANTITATIVE ASSESSMENT OF FIXATIONAL EYE-MOVEMENTS BY SCANNING LASEROPHTHALMOSCOPY", Acta ophthalmologica Scandinavica, 74(6), 1996, pp. 578-583

Abstract

A new method for quantifying fixational eye movements by scanning laser ophthalmoscopy was developed and the method was evaluated in ten normal persons. Video sequences of the ocular fundus obtained during fixation were recorded, and linear movements of the fovea between successive video frames were transformed to angular movements of the eye by an algorithm that takes into account the individual optical properties of the eye. A computer program was developed to automatically calculate the amplitude, the direction, and the duration of the angular movements together with the precision of each of these estimates. Two types of eye movements could be recognized in normal persons; a fast type (saccades) which was initiated and terminated within one video frame (20msec), and a slow type (drifts) which lasted more than 8 video frames(160 msec). The mean amplitude of the fast movements (0.41 degrees) tvas significantly higher than the mean amplitude of the slow movements(0.31 degrees). The method was found to be suitable for quantifying fixational eye movements in clinical trials while simultaneously visualizing the ocular fundus. However, by refining the determination of thefoveal position on the SLO images the precision of the method can be further improved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 09:05:57