The magnitude of foveal suppression during fixation disparity in presbyopic patients

Faudziah Abd-Manan, T. C A Jenkins, N. A. Kaye

    Research output: Contribution to journalArticle

    Abstract

    The characteristics of foveal suppression (FS) in fixation disparity (FD) due to visual stress were investigated and their relationship's between, age, symptoms, and the effect of temporary elimination of FD using prisms on the degree of the FS were analysed. Forty-five presbyopic subjects (15 without FD and 30 with stress related FD) participated in the study. The subjects underwent comprehensive optometric examination prior to the study. Their FS and FD were measured. The FD was later corrected with ophthalmic prisms, the power of which was equally divided between the eyes, and the FS was later verified. Age and FS had no significant correlation for subjects without FD (Spearman's rs = 0.17, p = 0.55,NS) and in subjects with FD (rs = 2.49, p = 0.19, NS), respectively. Correlation between the degree of FS and FD was weak (rs=0.38, p=0.07), however the magnitude of FD significantly increased with age (r=0.27, p=0.04). Subjects with FD had significantly larger degree of FS compared with subjects without FD (Wilcoxon's Z=-0.25, p=0.01). There was no significant difference in the magnitudes of FD (t = -0.38, p=0.07) and in their degrees of FS (Mann-Whitney U = 1.5, p=0.71) between subjects with and without symptoms. Correcting the FD with prisms generally reduced the degree of FS (Wilcoxon's Z=1.96, p=0.04), however, significant change in FS only occured in subjects with symptoms (Z=-1.97, p=0.03), but was not significant in subjects without symptoms (Z=-0.70, p=0.48).

    Original languageEnglish
    Pages (from-to)50-59
    Number of pages10
    JournalMalaysian Journal of Medical Sciences
    Volume10
    Issue number2
    Publication statusPublished - Jul 2003

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    Vision Disparity

    Keywords

    • Fixation disparity
    • Foveal suppression
    • Prism correction
    • Symptoms

    ASJC Scopus subject areas

    • Medicine(all)

    Cite this

    The magnitude of foveal suppression during fixation disparity in presbyopic patients. / Abd-Manan, Faudziah; Jenkins, T. C A; Kaye, N. A.

    In: Malaysian Journal of Medical Sciences, Vol. 10, No. 2, 07.2003, p. 50-59.

    Research output: Contribution to journalArticle

    Abd-Manan, Faudziah ; Jenkins, T. C A ; Kaye, N. A. / The magnitude of foveal suppression during fixation disparity in presbyopic patients. In: Malaysian Journal of Medical Sciences. 2003 ; Vol. 10, No. 2. pp. 50-59.
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