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Results for “FIXATION, OCULAR”

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At least 505 records · Page 28Linked to original sources
PubMed1977

Migraine: fusional-eye movement stress.

This paper indicates that the sources of migraine have always been in doubt, from ancient times when physicians first described the syndrome of migraine without clarifying it sources to the present day when physicians, still in some doubt, contend that excess of such substances as acetylcholine or serotonin may trigger the migraine. This paper argues that dynamic binocular seeing, normally a stress function, excites the migraine headache, primarily, howver, among visual pain sensitive individuals. Cases are offered whose migraine is relieved by creating a finer binocular seeing balance through fusion-eye movement training with the V.T. Reading Aid.

Accommodation, Ocular↗
PubMedDate not supplied

Fixation suppression of the vestibulo-ocular reflex (VOR) during sinusoidal stimulation in humans as related to the performance of the pursuit system.

Fixation suppression (FS) of the vestibulo-ocular reflex (VOR) was tested during passive sinusoidal body rotation with a frequency of 0.1 to 1.0 Hz and stimulus amplitudes ranging from 10 degrees to 240 degrees. To test whether FS can be explained by an internal pursuit signal opposite to the VOR, pursuit and the VOR under different instructional sets were studied. Both pursuit and FS decrease with increasing frequency and stimulus amplitude and seem to be limited by stimulus acceleration. Gains in FS calculated on the basis of the VOR during mental arithmetic correspond closely to the frequency and amplitude dependent pursuit gain, suggesting that an internal pursuit signal plays a major role in VOR suppression.

Adult↗
PubMed2000

[Analysis of energy levels for Nd:YAG laser capsulotomy in secondary cataract].

BACKGROUND: Formation of secondary cataract is influenced by various factors, such as IOL material, IOL design, age, follow-up time and ocular and systemic diseases. It has not yet been studied whether these factors have an clinical impact on the energy used for Nd:YAG laser capsulotomy. PATIENTS AND METHODS: We examined 172 patients, aged 67.3+/-15.9 years, concerning energy levels required for Nd:YAG laser capsulotomy. We analysed the influence of age, implant duration, IOL fixation and ocular conditions on total energy and repetition rate of Nd:YAG laser capsulotomy. Sixty-nine patients (43. 7%) had no other ocular pathology (control), 24 (15.2%) glaucoma, 14 (8.9%) diabetic retinopathy, 12 (7.6%) retinitis pigmentosa, 8 (5. 1%) high myopia, 7 (4.4%) triple procedure with perforating keratoplasty. Twenty-four (15.2%) presented with various additional ocular conditions such as pseudoexfoliation syndrome. Patients had undergone cataract surgery between 1988 and 1995 with implantation of PMMA-IOLs. RESULTS: Nd:YAG laser capsulotomies were performed on average 28.2+/-17.7 months postoperatively. The average total energy used was 12.7+/-9.4 mJ. Visual acuity (Pre-YAG) was 0.3+/-0.2. In the control group there was no correlation between energy and implant duration or age (P>0.43). 26 patients required a second Nd:YAG laser capsulotomy. Patients with retinitis pigmentosa showed a significantly higher re-YAG rate than the other patient groups (P=0.00059). In eyes with sulcus fixation of the IOL, capsulotomies were performed earlier and with higher energy levels than for in-the-bag fixation. CONCLUSIONS: The different ocular conditions of the anterior and posterior segment showed a different profile for Nd:YAG laser capsulotomy energy level and Nd:YAG laser repetition rate. Sulcus fixation of an IOL resulted in earlier capsulotomies with higher energy levels.

Aged↗
PubMed1975

Genetic analysis of vergence measures in populations with varying incidences of strabismus.

Genetic parameters were contrasted for vergence amplitudes within three populations--esotropic, exotropic, and randomly selected populations-who differed in their incidence of subtypes of strabismus. In general, heritabilities for convergence exceeded those for divergence, and heritabilities for recovery points exceeded those for break points. Heritability estimates for diveregence amplitudes were significantly different for the random and esotropia populations, while convergence heritability estimates for these groups were similar. Thus, gene differences influencing divergence ability contributed to genetic variance for strabismus.

Accommodation, Ocular↗
PubMed1975

Spectral analysis of the EEG recorded during stimulation of the human fovea.

Computer spectral analysis was performed on the EEGs of 6 subjects recorded during monocular foveal stimulation. Stimulus wavelength and subjective brightness were varied independently to determine their importance to changes in the ongoing EEG. The contribution of oculomotor control to these effects and the retinal area of their origin were also investigated. The major results were as follows. (1) Stimulation of the fovea reduced the amplitude of the EEG and the coherence between hemispheres at all frequencies, but most dramatically in the alpha band. (2) It increased the variance of EEG amplitudes and widths of spectral peaks in the alpha band and shifted these peaks to lower frequencies. (3) Auto-spectral intensities in the alpha band were enhanced slightly at brightness levels near photopic threshold, but were unaffected by changes in stimulus wavelength. (4) The fovea appeared to be the most effective retinal area in which irradiation attenuated ongoing alpha activity.

Accommodation, Ocular↗
PubMed1972

Vergence in the cat.

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Accommodation, Ocular↗