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http://dx.doi.org/10.14479/jkoos.2013.18.3.321

A Correlation Between Vertical Fixation Disparity and Stereopsis at Near  

Yoon, Min-Hwa (Dept. of Ophthalmic Optics, Dongkang College)
Publication Information
Journal of Korean Ophthalmic Optics Society / v.18, no.3, 2013 , pp. 321-327 More about this Journal
Abstract
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(R) 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 25 cm 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.
Keywords
Vertical fixation disparity; Fixation disparity slope; Vertical fixation disparity types; Stereopsis;
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Times Cited By KSCI : 3  (Citation Analysis)
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1 Ogle KN. Researches in binocular vision. 1st Ed. New York: Hafner, 1965;69-93.
2 Park HJ. Analysis of binocular vision by Wesson fixation disparity card. J Korean Oph Opt Soc. 2007;12(1):53-59.
3 Sucher DF, Stewart J. Vertical fixation disparity in learning disabled. Optom Vis Sci Dec. 1993;70(12):1038-1043.   DOI   ScienceOn
4 Luu CD, Green JF, Abel L. Vertical fixation disparity curve and the effects of vergence training in a normal young adult population. Optom Vis Sci. 2000;77(12):663-669.   DOI   ScienceOn
5 Tychsen L. Binocular vision. In; Moses RA et al. Adler's physiology of the eye, 9th Ed. St Louis Mosby, 1992;773- 810.
6 Romano PE, Romano JA, Puklin JE. Stereoacuity development in children with normal binocular single vision. Am J Ophthalmol. 1975;79(6):966-971.   DOI
7 Griffen JR. Binocular Anomalies, Procedures for vision therapy, 2nd Ed. Chicago: Professional Press, 1982;415.
8 Hasse HJ. Zur fixations disparation, 2nd Ed. Heidelberg: Verlag der deutschen optikerzeitung, 2000;215-223.
9 Saladin JJ. Effects of heterophoria on stereopsis. Optom Vis Sci. 1995;72(7):487-492.   DOI   ScienceOn
10 Sung PJ. Optometry, 2nd Ed. Seoul: Daihakseolim, 2002; 226-228, 230, 237, 252.
11 Jin YH. Strabismus, 1st Ed. Ulsan: UUP, 1997;67-75.
12 Ogle KN, Martens TG, Dyer JA. Oculomotor imbalance in binocular vision and fixation disparity, 1st ed. Philadelphia: Lea&Febiger, 1967;75-119.
13 Bae HJ, Yun MO, Kim JY, Song SJ, Kim JS, Eom JH, et al. The study of near fixation disparity by wesson fixation disparity card. Korean J Vis Sci. 2012;14(1):56-62.
14 Pickwell LD, Gilchrist JM, Hesler J. Comparison of associated heterophoria measurements using the mallett test for near vision and the sheedy disparometer. Ophthal Physiol Opt. 1988;8(1):19-25.   DOI   ScienceOn
15 Simons K. Stereoacuity norms in young children. Arch Ophthalmol. 1981;99(3):439-445.   DOI   ScienceOn
16 Tychsen L. Binocular vision, In : William MH ed. Adler's physiology of the eye, 9th Ed. St Louis: Mosby 1992;773- 853.
17 Von Noorden GK. Binocular vision and ocular motility, 5th ed. St Louis: Mosby, 1996;8-40.
18 Yoon DH, Lee SU, Choi O. Ophthalmology, 2nd Ed. Seoul: Ilchokak, 1991;205.
19 Parks MM. Monofixation syndrome. In : Tasman W. Duane's clinical ophthalmology, 1st Ed. Philadelphia: J.B. Lippincott comp, 1991;1-12.
20 Parks MM. Binocular vision. In : Tasman W. Duane's clinical ophthalmology, 1st Ed. Philadelphia: J.B. Lippincott comp, 1991;1-14.
21 Parks MM. Stereoacuity as an indicator of bifixation. In : Strabismus symposium, 1st Ed. New York: S Karger, 1968; 258-260.
22 Ing MR. Early surgical alignment for congenital esotropia. Ophthalmology. 1983;90(2):132-135.   DOI
23 Park HJ, Yoon Y. The study of vertical fixation disparity by fixation disparity card. J Korean Oph Opt Soc. 2010; 15(1):61-66.
24 Jimnez JR, Olivares JL, Prez-Ocn F, del Barco LJ. Associated phoria in relation to stereopsis with random-dot stereograms. Optom Vis Sci. 2000;77(1):47-50.
25 Saladin JJ. Stereopsis from a performance perspective. Optom Vis Sci. 2005;82(3):186-205.   DOI   ScienceOn
26 Shin HS, Lee SH, Yun MO, Kim MY, Bae HS, Park SC. Relationship between the degree of exophoria and stereoacuity. J Korean Oph Opt Soc. 2009;14(2):41-46.
27 Ogle KN. Researches in binocular vision, 1st Ed. New York: Hafner, 1964.
28 Sung PJ. Optometry, 6th ed. Seoul: Daihak publishing company, 2008;247-253.
29 Jenkins TC, Abd-Manan F, Pardhan S. Fixation disparity and near visual acuity. Ophthal Physiol Opt 1995;15(1): 53-58.   DOI   ScienceOn
30 Kim DN. Binocular vision, 1st Ed. Seoul: Shinkwang pub, 2010;240.
31 Leske DA, Holmes JM. Maximum angle of horizontal strabismus consistent with true stereopsis. J AAPOS 2004;8(1):28-34.   DOI   ScienceOn
32 Ukwade MT, Bedell HE, Harwerth RS. Stereopsis is perturbed by vergence error. Vision Res 2003;43(2):181-193.   DOI   ScienceOn
33 Elliott DB. Clinical procedures in primary eye care, 3rd ed. New York: Butterworth Heinemann, 2007;201-206.
34 Min BM, Park WC. The Relationship between visual acuity and titmus stereoacuity. J Korean Oph Soc. 1987; 28(6):1339-1342.
35 Kwon MJ, Byun JW, Jeon IC, Mah KC. The Effect on srereopsis by induced deviation during prism adaptation. Korean J Vis Sci. 2009;11(3):187-201.
36 North RV, Henson DB, Smith TJ. Influence of proximal, accommodative and disparity stimuli upon the vergence system. Ophthal Physiol Opt. 1993;13(3):239-243.   DOI   ScienceOn