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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Der Ophthalmologe 97 (2000), S. 629-632 
    ISSN: 1433-0423
    Keywords: Schlüsselwörter Videookulographie ; Dreidimensionale Positionsbestimmung ; Gegenrollung ; Interokuläre Differenzbildung ; Irisüberlagerung ; Keywords Object squint measurement ; Iris overlay procedure ; Interocular difference ; Three-dimensional video-oculography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Background. It has long been a goal to develop a means to measure squint angles in three dimensions simultaneously. A three-dimensional binocular method is naturally needed especially with surgical procedures that affect three dimensions of ocular motility. Methods. Special modifications of a videographic method provide simultaneous online data on the three-dimensional position of the eyes. The interocular difference is equal to the amount of squint, depending on the direction of gaze, head-tilt/direction of gravity, and convergence. Results. The method introduced provides three-dimensional and binocular documentation of ocular movements. This could lead to improve pre- and postsurgical examination, especially of rotational disturbances, and it could also offer an objective means for comparing the results of various surgical procedures.
    Notes: Zusammenfassung Hintergrund. Die dreidimensionale Videookulographie wird für den strabologischen Bereich modifiziert und als binokulare Methode vorgestellt. Methode/Ergebnisse. Durch die Videoanalyse eines Pupullenbildes kann die horizontale und vertikale Position des Auges bestimmt werden. Rotatorische Bewegungen um die Blicklinie werden mit einem speziellen Überlagerungsverfahren von Irismerkmalen gemessen. Neue Prozessoren ermöglichen eine alternierende Positionsbestimmung mit 25 Hz und ebenso schneller Berechnung der interokulären Positionsdifferenz. Das Bezugssystem in Form einer Art Taucherbrille mit Videokameras ist an den Kopf des Probanden gebunden. Semitransparente Spiegel erlauben u. a. 9 Blickpositionen analog zur Tangententafel. Die freie Beweglichkeit des Kopfes dient zur Messung von Innenohreinflüssen bei okulärer Gegenrollung. Schlussfolgerung. Die vorgestellte Methode ermöglicht die objektive, simultane Untersuchung beider Augen in 3 Dimensionen in Echtzeit und mit Angabe der Schielwinkel in den 3 Dimensionen.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2015-07-28
    Description: Background and Purpose— Transorbital sonography may help establish diagnosis of central retinal artery occlusion (CRAO). Next to Doppler sonographic proof of CRAO, an intra-arterial spot sign can be detected in some cases. We hypothesized that it reflects calcified components. It may be associated with embolization from atherosclerotic plaques and may negatively influence thrombolysis. Methods— Prospective monocenter study of 46 patients with ophthalmologically confirmed CRAO. Systemic tissue-type plasminogen activator thrombolysis was performed when appropriate. All patients received etiologic workup. Results— CRAO was confirmed by Doppler in all patients. Fifty-nine percent of patients with arterio-arterial embolization were spot sign–positive compared with 20% from cardiac source ( P 〈0.05) and none with vasculitis. Eleven patients underwent thrombolysis. Clinically relevant visual improvement was only found in absence of a spot sign ( P 〈0.05). Conclusions— Transbulbar ultrasound is valuable for initial diagnosis and diagnostic workup of CRAO. In the light of inconsistent results of previous thrombolysis trials, ultrasound may identify patients more likely to benefit from thrombolytic treatment.
    Keywords: Clinical Studies, Doppler ultrasound, Transcranial Doppler etc., Thrombolysis
    Print ISSN: 0039-2499
    Electronic ISSN: 1524-4628
    Topics: Medicine
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