June 2015
Volume 56, Issue 7
Free
ARVO Annual Meeting Abstract  |   June 2015
The relationship between ocular sensory dominance and stereopsis
Author Affiliations & Notes
  • Ziming Liu
    Shenyang He Eye Hospital, Shenyang, China
    College of Optometry, Nova Southeastern University, Davie, FL
  • Hua Bi
    College of Optometry, Nova Southeastern University, Davie, FL
  • Bin Zhang
    College of Optometry, Nova Southeastern University, Davie, FL
  • Zuopao Zhuo
    College of Optometry, Nova Southeastern University, Davie, FL
    Optometry, The Affiliated Eye Hospital of Wenzhou Medical University, Wenzhou, China
  • Qingxia Fan
    Shenyang He Eye Hospital, Shenyang, China
  • Ling Xu
    Shenyang He Eye Hospital, Shenyang, China
  • Wei He
    Shenyang He Eye Hospital, Shenyang, China
  • Footnotes
    Commercial Relationships Ziming Liu, None; Hua Bi, None; Bin Zhang, None; Zuopao Zhuo, None; Qingxia Fan, None; Ling Xu, None; Wei He, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science June 2015, Vol.56, 551. doi:
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      Ziming Liu, Hua Bi, Bin Zhang, Zuopao Zhuo, Qingxia Fan, Ling Xu, Wei He; The relationship between ocular sensory dominance and stereopsis. Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):551.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: Stereopsis is the highest form of binocular visual processing, in which relative depth information is extracted from two slightly different retinal images. During the process, the visual brain receives and compares the signals sent from the two eyes. However, the two eyes do not always have equal access to the visual brain. Just as hand dominance, ocular dominance, the tendency to prefer visual input from one eye to the other, also exists. It is not clear whether fine stereopsis(lower stereothreshold and quicker response) would only be found in persons with two balanced eyes. This hypothesis has never been tested before because traditional methods to measure ocular dominance were qualitative, which can only identify the dominant eye without showing the degree of dominance. In this study, we set to quantify the relationship between stereopsis and ocular sensory dominance.

Methods: Thirty subjects participated in the study. For each subject, ocular dominance was quantified with the continuous flashing technique and ocular dominance index(ODI) was computed. For stereopsis, the stereothresholds were measured with 5 viewing durations ranged from 25 to 400ms. The functions for stereothresholds versus viewing durations were analyzed by an empirical model of quadratic summation, in the form of th= Dmin(t-2+Tmin-2)0.5 where th is the stereothreshold at a given viewing duration(t), Tmin is the constant that determines the horizontal position of the function, which is related to the time at which the stereothreshold becomes independent of duration(critical duration). Dmin is the constant that determines the vertical position of the function and is equal to the stereothreshold when t=Tmin.

Results: 60% of the subjects showed two relative balanced eyes(ODI < 3db), 29% had moderate ocular dominance(3db≤ODI≤ 9db), and approximately 11% showed strong ocular dominance(ODI> 9db). For subjects with two relatively balanced eyes or moderate ocular dominance, the Dmin values significantly lower than those with strong ocular dominance. Also, the Tmin values were significantly shorter in subjects with two relatively balanced eyes or moderate ocular dominance.

Conclusions: People with two relatively balanced eyes tend to have better stereopsis(small Dmin and short Tmin).

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