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Intermittent oscillopsia in a case of congenital nystagmus: Dependence upon waveform

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conference contribution
posted on 2024-06-05, 06:52 authored by Larry AbelLarry Abel, IM Williams, L Levi
Spontaneous reports of oscillopsia are rare in cases of congenital nystagmus (CN). We examined the relationship between nystagmus waveform characteristics and oscillopsia in one such case. To reduce the patient's nystagmus, she was fitted with contact lenses. We examined the effects of tactile feedback by applying local anesthetic while she wore the lenses. When she was without lenses, we provided tactile feedback by applying gentle finger pressure to one eyelid. She was also asked to look at a peripheral afterimage. Nystagmus was analyzed for frequency, amplitude, foveation duration, and drift velocity, if foveation was not perfectly stable. Perceived target stability was recorded. The patient noted oscillopsia during the initial baseline recording and with lid pressure. The image was stable with contact lenses with and without anesthesia and during the second session baseline; at these times, drift velocity was <4°/sec and foveation duration was >100 msec. No oscillopsia of the afterimage in dark was noted; she perceived it moving with her gaze as she attempted to look at it. It appears that in some CN patients, the suppression of oscillopsia operates only within fixed limits of foveation stability and duration. When, because of internal or external factors, their nystagmus exceeds these, oscillopsia results.

History

Volume

32

Pagination

1-5

Location

Surfers Paradise, Qld.

Open access

  • Yes

Start date

1990-03-14

End date

1990-03-16

ISSN

0146-0404

Language

eng

Notes

Published also in Investigative Ophthalmology & Visual Science November 1991, Vol.32, 3104-3108 Also presented at the Annual Meeting, Association for Research in Vision and Ophthalmology, April 29-May 4, 1990, Sarasota, Florida

Publication classification

EN.1 Other conference paper

Title of proceedings

Proceedings of the Sixth Meeting of the International Strabismological Association Surfers Paradise, Australia, 1990

Event

Strabismus and ocular motility disorders. International congress (6th : 1990 : Surfers Paradise, Qld.)

Issue

12

Publisher

Association for Research in Vision and Ophthalmology

Place of publication

Rockville, Md.

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