PubMed · 9284616
The source did not provide an abstract. Follow the original record for more information.
Explore connections, maps & timelines
Y Miyake. 1997. [Objective visual function tests for retinal pathophysiology].. https://pubmed.ncbi.nlm.nih.gov/9284616/
Cite the original work for its findings. Save a collection to share your selection of sources.
KEEP EXPLORING
It has been hypothesised that during natural vision, retinal image motion and eye motion information exert antagonistic effects on balance that cancel each other out. In a previous study, we found that pursuit movements of the eye unaccompanied by background slip on the retina induced strong, stereotyped anteroposterior sway in dynamic balance. In the present work, we investigated the influence of background retinal image slip alone on anteroposterior dynamic balance. We expected that retinal slip without ocular pursuit would induce large anteroposterior sway. Circular slip without rotation of the whole visual field image on the retina was obtained using a rotating prism. In this study, carried out on monocular vision, eye movement was prevented by fixating a stationary target seen through a small aperture in the prism. Anteroposterior dynamic balance conditions were elicited by a rocking platform. Strong, stereotyped anteroposterior sway accompanied by a visual illusion of target motion was observed. The induced sway was synchronised to the stimulus and led to a significant disturbance of balance. The similarity in magnitude of the effects of both retinal image motion studied here and eye motion information obtained previously, and their opposing phases, strongly support the initial hypothesis that the antagonistic effects of the two sources of information provided by normal ocular pursuit could interact in an additive algebraic mode.
PURPOSE: To report on the development of infantile nystagmus in a patient's first year of life. METHODS: A case study using consecutive photo-oculographic and electro-oculographic eye movement recordings in the subject ranging between 1 and 12 months of age. RESULTS: Although no nystagmus was present at 5 weeks of age, square-wave jerks were recorded at 7 weeks, and a small pendular nystagmus was recorded at 8 weeks. At 10 weeks of age, evaluation revealed predominantly larger jerk-type nystagmus with increasing and decreasing exponential velocities of the slow phase. After 14 weeks of age, the nystagmus became smaller and was predominantly pendular. Between 7 and 12 months of age, binocular electro-oculography recordings showed conjugate pendular nystagmus typical of infantile nystagmus. CONCLUSION: This is the first report documenting that, at least in some forms of infantile nystagmus, eye movement abnormalities are not present at birth. Before the development of the typical pattern of infantile nystagmus waveforms (that is, conjugated pendular or jerk-type nystagmus with increasing exponential velocity slow phases), saccadic abnormalities (square-wave jerks) and jerk-type nystagmus with increasing as well as decreasing velocities were observed.
A method for monitoring eye movements in humans during functional MRI is presented. It is based on the acquisition of electro-oculographic (EOG) signals near one eye. EOG potentials were amplified and converted into an optical signal just outside the head coil. An optical fiber was used for signal transmission from inside the magnet bore to the control room. The EOG sensor was tested during EPI sequences at 1.5 Tesla without contamination of the MR signal. Some flow related artifacts on the EOG were observed inside the magnet, but no additional interactions from the MR sequence. An analysis of the latency, direction, and amplitude of the saccadic eye movements was possible.