Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “FIXATION, OCULAR”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 325 records · Page 18Linked to original sources
PubMed1990

Extraorbital use of a disinserted superior oblique as a sling in third nerve palsy: a new single-stage surgical technique.

The management of third cranial nerve palsy is surgical. The usual technique is to correct alignment of the eyes in the first stage, followed by ptosis correction by a sling operation in the second stage. A new single-stage surgical technique involved the disinsertion of superior oblique muscle to bring the eye in a midline position. Simultaneously it is used extraorbitally as a sling to raise the ptotic upper eyelid. Postoperatively a fairly good cosmetic effect was achieved, but the upper eyelid showed a paradoxic aberrant elevation on eso-depression.

Accommodation, Ocular↗
PubMed1990

Proximally induced accommodation and accommodative adaptation.

To determine the effect of proximally induced accommodation (PIA) on accommodative adaptation, this study has examined the posttask shift in tonic accommodation (TA) following 5-min monocular viewing of equivalent-sized targets located at distances of 0.33 and 5 m. The distal target was viewed through a negative lens to equate the dioptric stimuli (3 D). The steady-state accommodative response was measured subjectively in 10 subjects using a Hartinger coincidence optometer. A significant correlation was observed between the degree of adaptation following the two conditions, with the magnitude of adaptation for the distal target being approximately half that for the nearer target. Furthermore, adaptation magnitude was inversely correlated with pretask TA under both conditions. These results indicate that PIA can produce accommodative adaptation. The implications of this finding are discussed with regard to models of the accommodative mechanism.

Accommodation, Ocular↗
PubMed1989

Vergence.

Explore the source record for details and available documents.

Convergence, Ocular↗
PubMedDate not supplied

Myopic strabismus fixus convergens.

A case report of myopic myositis, a rare entity, leading to strabismus fixus convergens, occurring in a high myope at the age of 46 years is presented. The possible differential diagnosis along with the aetiopathogenesis is discussed.

Convergence, Ocular↗
PubMed1988

Temporal integration of stimulus increments under chromatic adaptation: effects of adaptation level, wavelength, and target size.

The threshold-duration functions were determined for a 520-, 570-, or 650-nm test presented upon the various monochromatic backgrounds. The variation of the threshold-duration functions with the background intensity, taken with the 520- or 650-nm test, showed a strong dependence on the background wavelength. This wavelength difference became prominent for the high background intensities: for the bright 570-nm background, partial summation occurred for the duration range from 50 to 200 msec, while such a partial summation effect was very small for the bright 520- and 650-nm background. Test for test-mixture additivity indicated that the longer integration time, obtained for the 520- or 650-nm test with the 570-nm background, was attributed to contribution of the opponent-color process. The elongation of the temporal integration period was found to be affected by the size of the test target. The interrelation among temporal and spatial summation, background intensity, and wavelength could be accounted for by temporal integration of the opponent-color process in addition to that of the cone mechanisms.

Adaptation, Ocular↗
PubMed1987

Exotropia associated with defective accommodation.

Despite the close association of convergence and accommodation, accommodative dysfunction is not often associated etiologically with exotropia. We studied 13 adolescent and young adults having intermittent exotropia and severely reduced accommodative function. Most patients had a prolonged history of visual symptoms that had not responded to therapy in the past. Clinical testing indicated that the patients had severely reduced amplitudes of accommodation and difficulty sustaining accommodation. Exotropia was manifest when the accommodative response was inadequate; relative orthophoria existed when the accommodative response was adequate. Treatment of the accommodative defect as well as the strabismus was successful for some patients. We recommend careful evaluation of accommodation for adolescent and young adults with exotropia to rule out an accommodative defect as a contributing cause.

Accommodation, Ocular↗
PubMed1987

Vertical yoked prism--patient acceptance and postural adjustment.

Vertical yoked prism is sometimes incorporated into multifocal lenses to obtain a thinner lens, or prescribed for oculomotor deficiencies, or occurs if the vertical placement of spectacle lenses before the eyes is inappropriate. Patient acceptance of and postural and perceptual adaptation to such prism were studied. Twenty-three subjects wore spectacles with no vertical prism and also with bilateral vertical yoked prism. The subject population could not significantly differentiate between 2 delta base down and 0 delta. There was a nearly unanimous rejection of 4 delta base down. Postural changes were significant during 4 delta wear but not during 2 delta wear. The results suggest that 2 delta may be accepted by most patients, but 4 delta will not.

Adaptation, Ocular↗
PubMed1986

Vergence instabilities and the longitudinal horopter.

The method of averaging was applied to the results of repeated measures of the longitudinal horopter for four subjects classified as binocularly normal and one anisometropic amblyope. The results produced a refined horopter locus and suggested that the so-called Vieth-Mueller circle is an adequate describer of the empirical longitudinal horopter, except in those cases involving uncorrected aniseikonia.

Amblyopia↗
PubMed1986

Lateral short-term prism adaptation in clinical evaluation.

Data were obtained from a normal clinical population regarding heterophoria, associated phoria and short-term prism adaptation in an attempt to differentiate between those subjects with symptoms and those without. Correlation between heterophoria, associated phoria, prism adaptation and symptoms was low. A short prism-adaptation test was found to be of little value in diagnosing decompensated heterophoria in the general population. Subjects diagnosed as having decompensated heterophoria did not have an abnormal short-term prism-adaptation system. The clinical implications of these findings are discussed in relation to the diagnosis of decompensated heterophoria and the prescribing of prismatic corrections.

Adaptation, Ocular↗