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KMID : 1159320140160010059
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Korean Journal of Vision Science
2014 Volume.16 No. 1 p.59 ~ p.71
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Analysis of the refractive status, accommodative response and visual perception development of childhood and adolescent with Down syndrome
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Ryu Dong-Kyu
Jeon In-Chul
Mah Ki-Choong
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Abstract
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Purpose: This study aims to analyze the vision, refractive status, accommodative response and visual perception development of childhood and adolescent with Down syndrome group.
Methods: Total 70 subjects at the age of 7 to 19 years were recruited in this study(normal group: 35 subjects, Down syndrome group: 35 subjects, respectively). We measured the distance and near visual acuity with LogMAR version, objective refraction by using an auto-refractor and Mohindra retinoscopy, the accommodative response at 4D, 6D and 10D accommodative stimuli by dynamic retinoscopy, and evaluated the visual perception development with K-DTVP-2(Korean Developmental Test of Visual Perception).
Results: Compared to normal group, the childhood and adolescent with Down syndrome showed significant decreases in the distance and near visual acuity(p<0.05), but mean refractive errors measured by the auto-refractor and the Mohindra retinoscopy were not showed significant difference. The astigmatic error and corneal power were significantly higher than normal group(p<0.05), and all accommodative responses at 4D, 6D and 10D accommodative stimuli were significantly lower than normal group(p<0.05). The results of the Korean Development Test of Visual Perception were showed significant difference(p<0.05). In the Down Syndrome group, the accommodative response showed high correlation with 7 out of the 8 sub-tests of K-DTVP-2 and 3 items of the integrated scale test as well(p<0.05).
Conclusions: Compared to the normal group at the same ages, the childhood and adolescent with Down syndrome showed lower distance and near visual acuity, and since the deterioration of accommodative response for near objects may have effect on the development of visual perception. There is considered that the measurement of accommodative response is necessary to added at assessment of visual acuity of childhood and adolescent with Down syndrome.
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KEYWORD
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Childhood and adolescent with Down syndrome, Accommodative response test, Korean Developmental Test of Visual Perception, Mohindra retinoscopy, dynamic retinoscopy
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