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Microdot test of foveal function. A comparison with visual acuity at high and low contrast
Karolinska Institutet, Stockholm, Sweden.
Karolinska Institutet, Stockholm, Sweden.ORCID iD: 0000-0002-5976-5193
2005 (English)In: Ophthalmic & physiological optics, ISSN 0275-5408, E-ISSN 1475-1313, Vol. 25, no 2, 81-86 p.Article in journal (Refereed) Published
Abstract [en]

PURPOSE: To define normal values across age from novel computerized tests of foveal vision and to compare the findings with visual acuity (VA) at high and low contrast. SUBJECTS AND METHODS: Sixty-one healthy volunteers, aged 22-87, with subjectively normal vision participated in the study. The right eye from each subject was tested with Snellen letter VA at high contrast, at 10% contrast using the Tri-VA test and with the Rarebit Microdot Fovea Test (RMFT), in addition to biomicroscopy and fundus examination. RESULTS: The median letter VA was 0.77 minimum angle of resolution (MAR; range 0.63-1.54) with a significant decline in letter VA with increasing age (r = 0.7, p < 0.001). The median Tri-VA resolution threshold at 10% contrast was 1.8 MAR (range 0.9-4.1) and a significant age effect (r = 0.7) was observed, most pronounced above 65 years. The median RMFT hit rate was 100% (range 97-100) in the age group below 65 years and 87.5% (range 34-98) in subjects older than 65 years. CONCLUSION: The study shows a decline in foveal function with age with all three methods, reflecting the loss of neural detectors with increasing age. The hit rate to microdot stimuli appears to be a sensitive measure, which can be used for fine-graded evaluation of foveal function.

Place, publisher, year, edition, pages
2005. Vol. 25, no 2, 81-86 p.
National Category
Ophthalmology Gerontology, specializing in Medical and Health Sciences
Identifiers
URN: urn:nbn:se:mdh:diva-10575DOI: 10.1111/j.1475-1313.2004.00244.xISI: 000227318500001PubMedID: 15713199Scopus ID: 2-s2.0-21244485781OAI: oai:DiVA.org:mdh-10575DiVA: diva2:360182
Available from: 2010-11-02 Created: 2010-10-27 Last updated: 2015-06-02Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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