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KMID : 1159320130150040405
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Korean Journal of Vision Science
2013 Volume.15 No. 4 p.405 ~ p.415
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Downward deviation at reading in children wearing progressive addition lens
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Kim Hak-Jun
Kim Hyun-A
Jeon In-Chul
Kim Shin-Young
Jang Man-Ho
Mah Ki-Choong
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Abstract
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Purpose: To clarify the effect of downward deviation at reading to myopic progression who myopic children wear progressive addition lenses for the purpose of retardation of myopia progression.
Methods: Eighty subjects (aged 8 to 12 yrs, spherical refractive error -0.50~-5.00D) including progressive lens group (42 subjects) and single vision lens group (38 subjects) were randomly arranged. We measured downward deviation at reading by using digital camera after 1 week, 2 weeks and 4 weeks. We analyzed correlation between downward deviation at reading and changes of refractive error and axial length after 6 months.
Results: Mean downward deviation of progressive lens group at near work was 7.14±1.19 mm. As the downward deviation was increased, the change of refractive error(r=0.52, p=0.00) and axial length(r=-0.47, p=0.00) were decreased. Myopic progression for six months in progressive lens and single vision lens groups were -0.25±0.22D and -0.37±0.23D, respectively. The difference between two groups was significant(p=0.02). The change of axial length between PAL group(0.13±0.10 mm) and SV group(-0.19±0.14 mm) also showed significant difference(p=0.03).
Conclusion: By wearing progressive addition lenses to children for six months, myopic progression was slower than single vision lens group. As the downward deviation at reading was increased, the effect of retarding myopic progression was increased. To maximize the effect of retarding myopic progression, there is considered that the practice to posture for sufficient downward deviation at reading is necessary to children wear progressive addition lenses.
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KEYWORD
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Myopia, Progression, Downward Deviation, Progressive Addition Lenses
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