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KMID : 1011420130180030321
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Journal of Korean Ophthalmic Optics Society
2013 Volume.18 No. 3 p.321 ~ p.327
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A Correlation Between Vertical Fixation Disparity and Stereopsis at Near
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Yoon Min-Hwa
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Abstract
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Purpose: To investigate a correlation between vertical fixation disparity and stereopsis by analyzing distribution of types of vertical fixation disparity.
Methods: In this study, RANDOT® stereotest partly using random dot was used in stereopsis tests. The vertical fixation disparity in close proximity categorized fixation disparity slope into six types on the basis of the result of measurement in when two thin lines, one for one eye looks, become overlapped as a line by adding into prism with Wesson fixation disparity card while maintaining a distance of 25cm from patients.
Results: In the types of near vertical fixation disparity curve, targeting 43 people, the first type 55.82% was the most distributed, the second type is the least 23.25%, the third type of 4.65%, the fourth type of 4.65%, the fifth type of 6.98%, the sixths types of 4.65% were distributed. The result of a correlation analysis, which shows the degree of linear correlation between two variables, represented that stereopsis is not correlated with Y-intercept (r = ?0.07) which show vertical fixation disparity, associated phoria (r = ?0.03) and dissociated phoria (r = ?0.00), but it was not statistically significant (p>0.05). Fixation disparity slope of vertical fixation disparity (r = 0.36) was shown to have a positive correlation with stereopsis. It has a low positive correlation and a meaningful statistics (p<0.05). The Y-intercept which indicates vertical fixation disparity was also not associated with stereopsis (r = ?0.07) and dissociated phoria (r = ?0.03), and this was not statistically significant (p>0.05), while it had a high correlation as well as a statistically significant with associated phoria (r = 0.89). There was a negative correlation between Y-intercept and fixation disparity slope of vertical fixation disparity (r = ?0.33). It showed a low relationship but statistically valuable (p>0.05). As a result of regression analysis, the stereopsis was changed as 7.631" if vertical fixation disparity changes 1’ and the vertical fixation disparity changed as 0.017’ if stereopsis changes 1’, and the change was statistically significant (p<0.05).
Conclusions: The study shows that there is a low correlation between stereopsis and vertical fixation disparity, and it is difficult to determine stereopsis only using vertical fixation disparity. Therefore, it suggests other factors above vertical fixation disparity have greater influence on stereopsis.
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KEYWORD
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Vertical fixation disparity, Fixation disparity slope, Vertical fixation disparity types, Stereopsis
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