Optokinetic nystagmus in patients with central scotomas in age related macular degeneration

BACKGROUND Reports on the impact of a loss in the central field of vision on optokinetic nystagmus (OKN) are varied. A study was therefore undertaken to reassess the role of the central retina in the generation of OKN in a large group of patients with age related macular degeneration. METHODS Four g...

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Bibliographic Details
Published in:British journal of ophthalmology 2001-02, Vol.85 (2), p.169-172
Main Authors: Valmaggia, C, Charlier, J, Gottlob, I
Format: Article
Language:English
Subjects:
age related macular degeneration
Aged
Aged, 80 and over
Biological and medical sciences
central scotoma
Humans
Macular Degeneration - complications
Macular Degeneration - physiopathology
Medical sciences
Middle Aged
Nystagmus, Optokinetic
Ophthalmology
optokinetic nystagmus
Original articles - Clinical science
Photic Stimulation - methods
Retinopathies
Scotoma - etiology
Scotoma - pathology
Scotoma - physiopathology
visual field defect
Visual Field Tests
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Summary:BACKGROUND Reports on the impact of a loss in the central field of vision on optokinetic nystagmus (OKN) are varied. A study was therefore undertaken to reassess the role of the central retina in the generation of OKN in a large group of patients with age related macular degeneration. METHODS Four groups of 20 patients were examined: a control group without scotoma and three groups with absolute central scotomas measuring 1°–10°, 11°–20°, and 21°–30°. OKN was elicited with black and white stripes moving nasally to temporally or temporally to nasally on a screen subtending 54° × 41° at four velocities (15, 30, 45, and 60°/s). OKN gain was measured using infrared oculography. RESULTS There was no significant difference in OKN gain between the control group and those with scotomas of 1°–10° and 11°–20°. A significant difference in OKN gain was found between the group with scotomas of 21°–30° and all other groups at stimulus velocities of 30, 45, and 60°/s (p
ISSN:0007-1161
1468-2079
DOI:10.1136/bjo.85.2.169