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Superior low-wavelength contrast sensitivity in asthenopics during voluntary efforts to accommodation
Högskolan i Gävle, Centrum för belastningsskadeforskning.
Högskolan i Gävle, Institutionen för teknik och byggd miljö, Ämnesavdelningen för inomhusmiljö.ORCID-id: 0000-0002-1386-5260
2006 (engelsk)Inngår i: 29th European Conference on Visual Perception: Perception 35. Suppl, 2006, s. 131-131Konferansepaper, Publicerat paper (Annet vitenskapelig)
Abstract [en]

The purpose of this work was to characterise short-(S)-wavelength-sensitive-cone mediated contrast sensitivity (CS) across twenty symptom-free subjects and eight asthenopics, all with normal-unaided-or-corrected visual acuity with no sign of oculomotor dysfunction. Threshold contrast sensitivity was assessed by the von Békésy tracking method from a viewing distance of 2.4 m (0.40 D). Three counterbalanced tasks required central fixation of black-and-white square-wave gratings (1, 5, 10, 14, and 17 cycles deg-1) presented through a low-pass (400 - 450 nm) tinted blue lens: through (i) a 0.0 D lens, (ii) a -1.50 D lens, (iii) a +1.50 D lens while attempting volitional accommodation to minimise blur. Baseline increases in eye-strain, which approached high levels at the end of the experiment, did not differentiate between the two groups of volunteers. Compared with symptom-free subjects, asthenopics exhibited larger magnitudes CS performance in the intermediate spatial frequencies during experimental conditions requiring voluntary increases in accommodation. The residual filtered light may encompass reference wavelengths habitually used by the asthenopics in retinal alignment as an adaptive strategy to spare accommodation from eye-strain. Alternatively, asthenopics, owing to inherent retinal factors, may 'drive' their accommodative system harder than symptom-free subjects.[Supported by the Swedish Council for Working Life and Social Research Grant 2005-0488 to HR.]

sted, utgiver, år, opplag, sider
2006. s. 131-131
HSV kategori
Identifikatorer
URN: urn:nbn:se:hig:diva-2975ISI: 000243599300414OAI: oai:DiVA.org:hig-2975DiVA, id: diva2:119637
Konferanse
29th European Conference on Visual Perception, St. Petersburg, 20-25 August 2006
Tilgjengelig fra: 2007-11-29 Laget: 2007-11-29 Sist oppdatert: 2019-11-04bibliografisk kontrollert

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