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Titolo:
Duration thresholds for target detection and identification in the peripheral visual field
Autore:
Seiple, W; Holopigian, K; Shnayder, Y; Szlyk, JP;
Indirizzi:
NYU, Sch Med, Dept Ophthalmol, New York, NY 10016 USA NYU New York NY USA10016 ch Med, Dept Ophthalmol, New York, NY 10016 USA
Titolo Testata:
OPTOMETRY AND VISION SCIENCE
fascicolo: 3, volume: 78, anno: 2001,
pagine: 169 - 176
SICI:
1040-5488(200103)78:3<169:DTFTDA>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORTICAL MAGNIFICATION FACTOR; CRITICAL FLICKER FREQUENCY; CONTRAST SENSITIVITY; GANGLION-CELLS; CONE VISION; MODULATION SENSITIVITY; SPATIAL-FREQUENCY; OUTER-RETINA; HUMAN ROD; ACUITY;
Keywords:
peripheral visual field; letter identification; duration thresholds;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Seiple, W NYU, Sch Med, Dept Ophthalmol, New York, NY 10016 USA NYU New York NY USA 10016 pt Ophthalmol, New York, NY 10016 USA
Citazione:
W. Seiple et al., "Duration thresholds for target detection and identification in the peripheral visual field", OPT VIS SCI, 78(3), 2001, pp. 169-176

Abstract

Purpose. In the current study, we measured threshold duration required to perform the tasks of letter identification, letter detection, grating orientation discrimination, and symmetry detection of targets presented as a function of retinal eccentricity. Methods. Targets were presented in the nasalvisual field on the horizontal meridian at eccentricities ranging from 0 degrees to 22 degrees. Threshold duration was calculated using a modified staircase procedure. Results. We found that for the task of letter identification, the rate of duration sensitivity loss was independent of the letter sire. In contrast, for the tasks of letter detection, grating discrimination, and symmetry detection, the rate of loss was greater for smaller targets than for larger targets. Conclusion. at equivalent target sizes, fetter identification always demonstrated the steepest decline in duration sensitivity with increasing eccentricity. This might be the case if the final stages of the identification process are rate limiting, It was hoped that by quantifying duration sensitivity of the peripheral retina, more appropriate temporal stimuli could be used in rehabilitation programs that train reading using eccentric preferred retina loci in patients with advanced macular disease.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/04/20 alle ore 23:16:10