Development of a Spatio-temporal Contrast Sensitivity Test for Clinical Use.
Purpose: We developed a contrast sensitivity test that considers an integrative approach of spatial and temporal frequencies to evaluate the psychophysical channels in processing two-dimensional stimulus for clinical use. Our new procedure provides a more efficient isolation of the magnocellular and...
| Publicado en: | Journal of Ophthalmic & Vision Research Vol. 17; no. 1; pp. 69 - 78 |
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| Autores principales: | , , |
| Formato: | equations & formulas research tables/charts Journal Article |
| Publicado: |
Knowledge E DMCC
2022
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=155234827&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 155234827 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 20082010 AY5S jtl: Journal of Ophthalmic & Vision Research issn: 20082010 maglogo: N pubinfo: dt: 2022 vid: 17 iid: 1 pid: 35682 pub: Knowledge E DMCC artinfo: ui: 155234827 155234827 155234827 10.18502/jovr.v17i1.10172 155234827 ppf: 69 ppct: 9 formats: fmt: @attributes: type: P tig: atl: Development of a Spatio-temporal Contrast Sensitivity Test for Clinical Use. aug: au: Costa, Marcelo Fernandes Henriques, Leonardo Dutra Pinho, Otávio Côrrea affil: Laboratório da Visão, Departamento de Psicologia Experimental, Instituto de Psicologia, Universidade de São Paulo, São Paulo, Brazil sug: subj: Brain Physiopathology Vision Tests Methods Visual Perception Physiology Human Neural Pathways Adolescence Adult Visual Acuity Reliability Psychophysics Adolescent: 13-18 years Adult: 19-44 years ab: Purpose: We developed a contrast sensitivity test that considers an integrative approach of spatial and temporal frequencies to evaluate the psychophysical channels in processing two-dimensional stimulus for clinical use. Our new procedure provides a more efficient isolation of the magnocellular and parvocellular visual pathways supporting spatiotemporal contrast sensitivity processing. Methods: We evaluated 36 participants of both sexes aged 18--30 years with 20/20 or better best-corrected visual acuity. Two spatial frequencies (0.5 cycles per degree [cpd] and 10 cpd), being in one of the three temporal frequencies (0.5 cycle per second [cps], 7.5 cps, and 15 cps), were presented in a highresolution gamma corrected monitor. A two-alternative forced-choice procedure was conducted, and the staircase method was used to calculate the contrast sensitivity. Reliability was assessed using a retest procedure within a month (±5 days) under the same conditions. Results: Results showed statistical significance in 0.5 cpd and 10 cpd spatial frequencies for 0.5 cps (F = 77.36; p < 0.001), 7.5 cps (F = 778.37; p < 0.001), and 15 cps (F = 827.23; p < 0.001) with a very high (η2 = 0.89) effect size. No statistical differences were found between the first and second sessions for all spatial frequencies. For reliability, a significantly high correlation and high internal consistency were found in all spatiotemporal conditions. The limits were calculated for normality. Conclusion: We developed an approach to investigate the spatiotemporal integration of contrast sensitivity designed for clinical purposes. The relative contribution of the low spatial frequencies/high temporal frequencies and the high spatial frequencies/low temporal frequencies of the psychophysical channels can also be evaluated separately. pubtype: Academic Journal doctype: equations & formulas research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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