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Titolo:
ANGIOSCOTOMETRY WITH THE SCANNING LASER OPHTHALMOSCOPE - COMPARISON OF THE EFFECT OF DIFFERENT WAVELENGTHS
Autore:
REMKY A; BEAUSENCOURT E; ELSNER AE;
Indirizzi:
RHEIN WESTFAL TH AACHEN,FAK MED,AUGENKLIN,PAUWELSSTR 30 D-52057 AACHEN GERMANY HARVARD UNIV,SCH MED,SCHEPENS EYE RES INST BOSTON MA 00000 UNIV REGENSBURG,AUGENKLIN D-8400 REGENSBURG GERMANY
Titolo Testata:
Investigative ophthalmology & visual science
fascicolo: 11, volume: 37, anno: 1996,
pagine: 2350 - 2355
SICI:
0146-0404(1996)37:11<2350:AWTSLO>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
PERIMETRY; VESSELS;
Keywords:
ANGIOSCOTOMATA; PERIMETRY; RETINA; RETINAL VESSELS; SCANNING LASER OPHTHALMOSCOPY; SHORT WAVELENGTH AUTOMATED PERIMETRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
19
Recensione:
Indirizzi per estratti:
Citazione:
A. Remky et al., "ANGIOSCOTOMETRY WITH THE SCANNING LASER OPHTHALMOSCOPE - COMPARISON OF THE EFFECT OF DIFFERENT WAVELENGTHS", Investigative ophthalmology & visual science, 37(11), 1996, pp. 2350-2355

Abstract

Purpose. Angioscotomas are scotomata caused by vessel shadows. Their extent may be influenced by physiological and pharmacologic conditionsand disease. In this study, the authors quantified angioscotomas in normal subjects using a fundus perimetry technique with a scanning laser ophthalmoscope. They further investigated the influence of two different wavelengths on scotoma depth. Methods. For blue-on-yellow perimetry, the authors used two different lasers--an argon laser (lambda = 458 nm) for stimuli and a low background and a HeNE (lambda = 594 nm) for a superimposed yellow background. For redon-red perimetry, the authors used another HeNe laser (lambda = 633 nm). Fundus illumination was provided by an infrared light. Five healthy subjects were examined. Twenty-one to 24 stimuli (200 msec duration, 0.4 degrees X 0.4 degrees) were presented at different intensities in randomized order in a 5 degrees X 2.5 degrees retinal test field, directly inferior and adjacent to the disk. Results. The depth of scotomas caused by major vessels varied in all subjects and depended on perimetry condition. To quantify the influence of vessels on sensitivity, the authors analyzed psychometric functions for stimuli projected on the vessels and for those far from the vessels. The authors found a significant difference for targets on the vessel compared to those far, which was more pronounced for the blue-on-yellow condition. Conclusions. Angioscotomas are detected better with blue targets on a yellow background than with red-on-red perimetry. The greater light absorption by hemoglobin and oxyhemoglobinat short wavelengths compared to longer wavelengths is not compensated for by visual mechanisms.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 13:53:18