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KMID : 1159320090110030187
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Korean Journal of Vision Science
2009 Volume.11 No. 3 p.187 ~ p.201
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The Effect on Stereopsis by Induced Deviation during Prism Adaptation
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Kwon Mi-Jung
Buyn Jang-Won
Mah Ki-Choong
Jeon In-Chul
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Abstract
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Purpose : To examine the stereopsis changes during the prism adaptation with horizontal or vertical prism in front of the eyes and to investigate the effect on stereopsis by prism-induced deviation during 30 minutes.
Methods : 42 subjects (23 males, 19 females, mean age of 25.3±3.2 yrs) with normal binocular single vision were recruited. 16ΔBO, 8ΔBI, 3ΔBU and 3ΔBD were randomly assigned to induce deviation on four different days. Stereopsis was measured before and upon introducing prism and 3, 6, 12, 20 and 30 minutes after using Three-needle Test(TN), Stereo Reindeer Test- Numbered circles(RNC) and The Borish Vectographic Nearpoint Card Ⅱ- Stereopsis Targets Cluster(BSC) and random dot Cell(BSRC). At the same time, heterophoria was also measured using Modified Thorington phoria test.
Results : When deviation was induced by the horizontal or vertical prism, each of the stereoapsis was dropped down. The kinetic stereoacuity using TN at distance was reduced in the order of BO, BI, BD and BU in which BD and BU was similar. The static steroacuity using RNC, BSC and BSRC at near was reduced in order of BO, BU, BI and BD. The reduced stereoapsis tended to return gradually toward baseline with the exponential decay curve during the 30 minutes. After introduction of prism the stereoapsis generally recovered in large amount to 6-minute, then the recovery getting smaller. There was a statistically high correlation between the changes of prism-induced deviation and stereoacuity during the adaptation, therefore this study gained the linear regression and exponential decay regression to estimate the prism adaptation by measuring stereopsis.
Conclusions : Inducing a deviation with horizontal or vertical prism negatively affected the stereopsis. However, during the prism adaptation occurred, the level of stereopsis was increased back toward the baseline. This study found that the prism adaptation can be estimated by measuring stereopsis.
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KEYWORD
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Heterophoria, Prism adaptation, Prism-induced deviation, Stereopsis
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