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Lighting conditions and optical filters effects on visual performance of speleologists exposed to cave environments

2016Journal article Open access
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dc.contributor.authorLança, Carla
dc.contributor.authorFernandes, Nádia
dc.contributor.authorMonteiro, Ana
dc.contributor.authorAlmeida, Ana
dc.date.accessioned2016-03-01T12:01:05Z
dc.date.available2016-03-01T12:01:05Z
dc.date.issued2016
dc.description.abstractThe aim of this study is to evaluate lighting conditions and speleologists’ visual performance using optical filters when exposed to the lighting conditions of cave environments. A crosssectional study was conducted. Twenty-three speleologists were submitted to an evaluation of visual function in a clinical lab. An examination of visual acuity, contrast sensitivity, stereoacuity and flashlight illuminance levels was also performed in 16 of the 23 speleologists at two caves deprived of natural lightning. Two organic filters (450 nm and 550 nm) were used to compare visual function with and without filters. The mean age of the speleologists was 40.65 (± 10.93) years. We detected 26.1% participants with visual impairment of which refractive error (17.4%) was the major cause. In the cave environment the majority of the speleologists used a head flashlight with a mean illuminance of 451.0 ± 305.7 lux. Binocular visual acuity (BVA) was -0.05 ± 0.15 LogMAR (20/18). BVA for distance without filter was not statistically different from BVA with 550 nm or 450 nm filters (p = 0.093). Significant improved contrast sensitivity was observed with 450 nm filters for 6 cpd (p = 0.034) and 18 cpd (p = 0.026) spatial frequencies. There were no signs and symptoms of visual pathologies related to cave exposure. Illuminance levels were adequate to the majority of the activities performed. The enhancement in contrast sensitivity with filters could potentially improve tasks related with the activities performed in the cave.pt_PT
dc.identifier.citationLança CC, Fernandes N, Monteiro A, Almeida A. Lighting conditions and optical filters effects on visual performance of speleologists exposed to cave environments. Int J Speleology. 2016;45(1):27-33.pt_PT
dc.identifier.doi10.5038/1827-806X.45.1.1933pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.21/5756
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherUnion Internationale de Spéléologiept_PT
dc.relation.publisherversionhttp://scholarcommons.usf.edu/ijs/vol45/iss1/3/pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectVisual functionpt_PT
dc.subjectSpeleologistpt_PT
dc.subjectOptical filterpt_PT
dc.subjectContrast sensitivitypt_PT
dc.subjectIlluminance levelpt_PT
dc.titleLighting conditions and optical filters effects on visual performance of speleologists exposed to cave environmentspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage33pt_PT
oaire.citation.startPage27pt_PT
oaire.citation.titleInternational Journal of Speleologypt_PT
oaire.citation.volume45pt_PT
person.familyNameLança
person.givenNameCarla
person.identifier.ciencia-id601A-6412-BF2F
person.identifier.orcid0000-0001-9918-787X
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication0320b455-ee19-4670-8bf2-10dce9de1bec
relation.isAuthorOfPublication.latestForDiscovery0320b455-ee19-4670-8bf2-10dce9de1bec

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