Objective:
To evaluate the efficacy of the multimedia visual perceptual learning system for improving visual acuity in pediatric patients with amblyopia and to discuss factors influencing the therapeutic effects of perceptual learning.
Methods:
This was a prospective randomized controlled study. Amblyopic children aged from 3 to 11 years (n=112) were recruited from the ophthalmology clinic. Participants were randomly assigned to the experimental group that utilized the multimedia visual perceptual learning system or a control group utilizing the synoptophore. All subjects underwent perceptual learning and patching or refractive correction, depending upon the individual situation. After the baseline visit, follow-up visits were held after 10, 20, and 30 treatments. Finally, the clinical efficacy and improvement of visual acuity in the two groups were analyzed and compared, using chi-square test, independent-samples t test, Pearson correlation test.
Results:
The curative effect of the experimental group was better than the control group at different training periods (Z=-4.128, -4.806, -3.063, P<0.001). The change in visual acuity in the experimental group was significantly higher at the 10th and 20th training sessions (t=3.471, 3.290, P<0.05). In the moderate and severe amblyopia groups, the curative effect of the experimental group was better than the control group (Z=-3.050, P=0.021), and was the same as in the anisometropic amblyopia group (Z=-2.864, P=0.004) and 7-11 year-old group (Z=-2.631, P=0.009). There was a moderate correlation at baseline and an improvement in visual acuity in both groups (r=0.690, 0.650, P<0.05).
Conclusions:
The multimedia visual perceptual learning system can achieve an optimal effect in a short period of time. The improvement in vision relates to the sex of the patient, and the degree and type of amblyopia, which are clinically significant to amblyopia therapy.
Key words:
amblyopia; perceptual learning; children
Objective To evaluate the practicability of three stereovision tests in the stereoacuity examination for Navy aviator recruiting.Methods The stereoacuity was measured both for the group of normal position of eye (242 subjects) and strabismus group (32 subjects) by Titmus,TNO test for stereoscopic vision (TNO) and Yan's Digital Stereovision tests.Results The percentage of normal stereovision (stereoacuity≤60″) in normal group was respectively 98.34% by Titmus, 92.98% by TNO and 97.52% by Yan's.There was no significant difference between the measurements of Titmus and Yan's test but the significance was found in TNO test compared with other teszs (Z=- 3.272、- 3.314, P＜ 0.05).In strabismus group, the percentage of normal stereovision was respectively 90.63% by Titmus, 71.88% by TNO and 75.00% by Yan's.Testing by TNO or Yan's had no statistic difference but for the testing by Titmus (Z= -2.825、-2.428, P＜0.05).Conclusions The Yan's Digital Stereovision test combined with Titmus test could be appropriate to stereoacuity examination for pilot recruitment.
Key words:
Depth perception ; Physical examination ; Personnel selection ; Diagnostic techniques,ophthalmological ;
Objective To determine effects of induced anisometropia on stereopsis to assess the potentially detrimental effects of uncorrected anisometropia on stereoacuity in sailers.Methods Twenty-five healthy adult volunteers,who were 22-34 years old(mean:27 years old)and free of ocular diseases,participated in the study.The different lenses ranging from 1-3 D were planced in front of right eyes of subjects,which leaded to 4 different types of anisometropia(simple hypometropia,simple hypermetropia.Stereoacuity was measured by YAN Shao-ming Digital Stereoscopic Test Charts.Results The levels of stereoacuity decreased in all subjects as the degree of anisometropia increased.One diopter of spherical anisometropia had subjects'stereoaeuity reduced to 50″-54″ and that of cylindrical anisometropia had subjects'stereoacuity reduced to 50″-52″.Regardless of type,three diopters of anisometropia had all suhjeets'stereoacuity reduced significantly.Conclusions Low levels of anisometropia can have potentially significant adverse effect on highgrade binocular vision function in adults.Foveal suppression,which is directly related to the degree of anisometmpia,may be responsible for the reduction of stereopsis.
Key words:
Stereoaeuity; Anisometropia; Sailer
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