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Biomedical subjects

D F Sucher

Publications and source records attributed to D F Sucher.

6 recordsLinked to original sources
PubMed1994

The association of headache and monocular blur effect in a clinical population.

PURPOSE: Because some headaches are known to be associated with errors in binocular vision and because monocular visual acuity has been observed to change in different directions of gaze during binocular viewing, a study was designed to see if headaches were associated with this phenomenon. METHOD: This cross-sectional study cross-classifies each subject in a sample selected in consecutive order from an optometric practice by whether or not the patient has at least three headaches per month and by whether or not the patient has the monocular blur effect. Each of the two examiners conducted this cross-classification separately on the same sample. The laterality of the headache and the side which exhibited the monocular blur effect were also noted. RESULTS: The resulting two-way tables are presented along with the results of the chi 2 tests. The results are statistically significant. CONCLUSION: It appears that a relation exists between the occurrence of headache and binocular vision anomalies associated with the action of the eye muscles. The extraocular muscles and relevant neurological and vascular physiology are discussed as they relate to headache.

Cross-Sectional Studies↗
PubMed1993

Vertical fixation disparity in learning disabled.

In this correlation study of visual parameters as related to learning disabilities, we considered several deficits: uncorrected refractive error, accommodative infacility, inaccurate pursuits, and vertical fixation disparity. Because vision is the primary sensory input involved in reading, it is nothing new to find a correlation between visual deficits and learning problems; however, vertical fixation disparity, unique in its relation to other sensory systems, deserves a great deal of attention. The high incidence of vertical fixation disparity measured in 5th and 6th graders with learning disabilities suggests that there is a plausible causal relation. Vertical oculomotor imbalance, vestibular problems, and learning disability are discussed.

Accommodation, Ocular↗
PubMed1991

Variability of monocular visual acuity during binocular viewing.

Two patients observed changes in the visual acuity of one eye when both eyes were viewing simultaneously in certain directions of gaze. While viewing targets presented during the Turville Infinity Balance (TIB) test, the acuity of the affected or amblyopic eye improved when the nonamblyopic eye was covered and binocular vision suspended. The vision of the amblyopic eye was also improved when an appropriate prism was held in front of either eye. The direction of the prism base was based upon the interrelations of horizontal, vertical, and cyclotorsional anisophoria and the amount of prism was the minimum necessary to improve the vision in the amblyopic eye and neutralize vertical fixation disparity. The correlation of variable monocular acuity, stereopsis, and fixation disparity with oculomotor balance is recorded and discussed.

Adult↗
PubMed1989

Influence of extraocular muscle imbalance on binocular performance.

In assessing binocular performance, it is possible that extraocular coordination is more significantly involved than presently recognized. Dynamic phorometry or phorometric testing in the nine cardinal directions of gaze is advised for evaluating the extraocular muscular system. These case reports used interrelation of phorias to evaluate binocular problems. The interpretation of these data helps determine the amount of horizontal prism necessary to reduce compensating vergences. Although a control group was not used, the elimination of associated vertical fixation disparity in these cases seemed to ameliorate binocular stress.

Aniseikonia↗
PubMed1979

Use of horizontal prism to correct vertical fixation disparity.

By noting the direction of gaze in which the vertical phoria is largest, one can determine where binocular discomfort is likely to be greatest. Treatment of the discomfort is then based upon prescribing horizontal prism for the horizontal phoria. The recommended amount of horizontal prism is that amount which reduces the vertical fixation disparity to zero. Although the fixation disparity can change in different directions of gaze, in most instances, the prescribed amount of horizontal prism is determined in the primary position of gaze.

Adolescent↗