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Biomedical subjects

M W Rouse

Publications and source records attributed to M W Rouse.

6 recordsLinked to original sources
PubMed1992

Binocular accommodative facility testing reliability.

This study evaluated the reliability of the 1-min binocular accommodative facility test by extending the testing period for 2 additional minutes. Subjects, ages 8 to 12 years, were tested for an initial 1-min period, to identify 2 groups, high fail (greater than 3, but less than 8 cpm, N = 30) and low fail (less than 3 cpm, N = 30), and then tested for an additional 2 min. The low fail group had greater test-retest reliability in both minutes 2 and 3. Both groups improved (high fails mean = 0.93 cpm, low fails mean = 0.37 cpm), but no clear statistical difference was found between groups. When diagnostic classification was monitored over the 3 min, 40% of high fails passed, whereas no low fails passed. The 1-min testing method appears reliable if the initial rate is less than 3 cpm. For patients whose initial rate is between 3 and 8 cpm, extended testing (1 to 2 additional minutes) may be needed to arrive at an accurate diagnosis, especially if presenting symptoms are absent.

Accommodation, Ocular↗
PubMed1991

Comparative study of computer-based and standard clinical accommodative facility testing methods.

Two methods for assessing accommodative facility were compared: the Computer Orthoptics Diagnostic Program and the standard Lens Flipper Method. In random fashion, 40 visually normal [modified clinical technique (MCT) screening] subjects, ages 10 to 18 years, were tested monocularly and binocularly on both methods. Scatter-plot comparisons of the data showed no apparent relation between the two methods, with correlation coefficients close to zero for both monocular (r = 0.0205) and binocular (r = 0.1180) results. In addition, the subject's diagnostic classification (pass or fail) was compared between the two methods. The kappa statistic indicated a low level of agreement between the two methods both monocularly and binocularly. These results suggest that the Computer Orthoptics' diagnostic test is not a valid method for diagnosing accommodative facility deficiencies.

Accommodation, Ocular↗
PubMed1990

Management of infantile-onset esotropia.

Background information on the prevalence, clinical characteristics, and differential diagnosis of infantile-onset esotropia is presented. A brief overview of early development of binocularity is also presented to set the stage for management, as well as a sequential treatment plan for two age groups of infantile esotropes: 1) infants and toddlers, and 2) preschool and "older" patients. Flowcharts and case examples are included to highlight the management principles for attaining maximum binocular function.

Adolescent↗
PubMed1989

Monocular accommodative facility testing reliability.

Recently, concern has been expressed about accommodative facility testing reliability, especially for subjects rated initially as failing. Our study evaluated an extended testing period's effect on reliability. Subjects, ages 8 to 12 years, were tested for an initial 1-min period; to identify two groups; high fails (greater than 6, but less than 11 cpm, N = 30) and low fails (less than 6 cpm, N = 30), and then for an additional 2 min. Mean rate change analysis showed both high and low fail groups improved their accommodative facility over extended testing (1.29 and 0.87 cpm, respectively), although no significant difference was found between the groups. In contrast, test-retest correlations indicate a higher reliability for the baseline rates among low fail (r = 0.720) as compared to high fail (r = 0.402) subjects. The difference between groups became more evident when diagnostic classification was monitored over the 3-min testing period, with 73.3% of the low fails remaining low fails, and 43.4% of the high fails reached the pass criterion. The 1-min testing method appears more reliable if the initial rate is less than 6 cpm. For patients whose initial rate is between 6 and 11 cpm, extended testing (1 additional min) may be needed to arrive at an accurate diagnosis, especially if presenting symptoms are absent.

Accommodation, Ocular↗
PubMed1989

Stereoscopic depth perception by static stereo-deficient observers in dynamic displays with constant and changing disparity.

The performance of 11 static stereo-deficient subjects and 11 static stereo-normal subjects was compared on two types of dynamic stereo displays--one where disparities were constant during motion and one where disparities changed continuously. Computer-generated displays simulating horizontal motion of figures at different depths or rotation of figures about a vertical axis were viewed through a Brewster stereoscope. About one-half of the subjects in our static stereo-deficient sample were able to make depth judgments on the basis of disparity in both types of dynamic displays. The clinical feature which appeared to distinguish those static stereo-deficient subjects who could use disparity information in dynamic displays from those who could not was early onset constant strabismus. These results indicate that a complete evaluation of stereo ability should include tests with dynamic displays, possibly including both constant and changing disparities.

Adult↗