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KMID : 1159320210230020195
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Korean Journal of Vision Science
2021 Volume.23 No. 2 p.195 ~ p.205
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Effect of Undercorrection Using Spectacle Lens and Multifocal Soft Contact Lens on Binocular Visual Function
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Park Inn-Jee
Chu Byoung-Sun
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Abstract
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Purpose : To investigate the effect of undercorrection using multifocal soft contact lens and +1.00 D spectacle lens on binocular visual function compared to no correction.
Methods : Seventeen individuals (mean age of 23.58±2.12 years) were recruited to participate in this study. Seventeen participants have less than sphere refractive error of ±1.00 D and with less than ?0.75 D of astigmatism. Repeated measurements were performed using three different correction options; no correction (NC), correction using multifocal contact lenses (CM) with a plano power for distance and addition up to +1.00 D and undercorrection using +1.00 D spectacle lens (UL). The battery of binocular visual function measures includes amplitude of accommodation, accommodative response, accommodative facility, amplitude of divergence, convergence facility and near/distance phoria.
Results : Types of vision correction had no significant effect on amplitude of accommodation, amplitude of divergence and distant phoria. Accommodative response with no correction was statistically significantly bigger than other two correction options, and CM induced statistically significant accommodative response compared to UL. Also, accommodative facility with no correction and CM were statistically significantly better than accommodative facility of UL.
Convergence facility with UL and CM were statistically significantly better than NC. Also, near phoria measured Howell chart with UL and CM were statistically significant than NC whereas near phoria measured with Maddox rod with UL was statistically different from NC.
Conclusion : Multifocal contact lens do not alter important changes in accommodative system yet provide better accommodative stimulus-response and vergence response. The subjects with multifocal contact lens exhibited decreased accommodative response and improved convergence facility. Thus, simultaneous image multifocal contact lenses may be useful for children and young adults who presented accommodative problems or vergence disorder.
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KEYWORD
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Binocular visual function, Multifocal soft contact lens, Undercorrection
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