PMID: 11913842Mar 27, 2002Paper

The proximity-fixation-disparity curve and the preferred viewing distance at a visual display as an indicator of near vision fatigue

Optometry and Vision Science : Official Publication of the American Academy of Optometry
W Jaschinski

Abstract

This laboratory study investigates the relation between measures of fixation disparity (FD) (and other optometric measures) and near vision fatigue at a computer workstation. Young adult subjects with normal binocular vision performed three blocks of a visual task of 30 min each. In Block A, the viewing distance was 100 cm, as a reference without near vision. In Block B, the viewing distance of 50 cm induced a defined near vision load. In Block C, subjects were free to choose a comfortable viewing distance. This preferred viewing distance was used as an indicator of near vision fatigue because subjects adopting longer viewing distances in Block C had more near vision fatigue at 50 cm in Block B. Subjects with preferred viewing distances longer than average (63 cm) had steeper slopes of FD as a function of viewing distance (100-30 cm), as shown by discriminant analyses. Thus, this steep proximity-FD curve indicates a weak disparity vergence system that may cause near vision fatigue. This may explain why some young adults prefer longer viewing distances at the computer workstation.

Associated Clinical Trials

Sep 30, 2016·Danielle IaconoDanielle Iacono

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Citations

Apr 2, 2008·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·Joanna M N OttoGuntram Kommerell
Aug 19, 2004·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Wolfgang Jaschinski
Aug 22, 2006·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Rajula Karania, Bruce J W Evans
Dec 17, 2008·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Joanna M N OttoGuntram Kommerell
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Apr 13, 2011·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Mark Rosenfield
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Jul 17, 2007·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Sowjanya GowrisankaranJohn R Hayes
Dec 1, 2005·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Wolfgang JaschinskiJulia Buchholz
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Mar 23, 2021·Clinical & Experimental Optometry : Journal of the Australian Optometrical Association·Maryam MirzaeianMehdi Khabazkhoob
Aug 26, 2021·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Alex Azuka IlechieFrank Assiamah

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