July 2018
Volume 59, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2018
Decreased binocular summation ratio in intermittent exotropia.
Author Affiliations & Notes
    Ophthalmology, Pusan National University Yangsan Hospital, Yangsan-si, Gyeongsangnam-do, Korea (the Republic of)
    Ophthalmology, Pusan National University Yangsan Hospital, Yangsan-si, Gyeongsangnam-do, Korea (the Republic of)
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    Commercial Relationships   JEONGMIN KWON, None; JAEHO JUNG, None
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    Support  None
Investigative Ophthalmology & Visual Science July 2018, Vol.59, 1020. doi:https://doi.org/
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      JEONGMIN KWON, JAEHO JUNG; Decreased binocular summation ratio in intermittent exotropia.. Invest. Ophthalmol. Vis. Sci. 2018;59(9):1020. doi: https://doi.org/.

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

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Purpose : To evaluate the binocular summation status in intermittent exotropia patients using the contrast sensitivity test.

Methods : Eighteen patients with intermittent exotropia and eight controls were assessed with binocular summation ratio using contrast sensitivity test. Binocular summation ratio was defined as the ratio of binocular contrast sensitivity to the contrast sensitivity of the better eye. We compared binocular summation ratio at five spatial frequencies (1.5, 3, 6, 12, and 18 cycles/degree) of intermittent exotropia patients to that of normal controls.

Results : There was a significant difference at 1.5 cycles/degree spatial frequency, intermittent exotropia patients had a lower binocular summation ratio compared to the normal control group (1.13 vs 1.47, p= 0.05). However, there was no signification differences between intermittent exotropia and control in 3, 6, 12, 18 cycles/degree spatial frequency (1.18 vs 1.08, p= 0.39, 1.52 vs 1.77, p=0.26, 1.99 vs 1.84, p=0.34, 1.80 vs 1.89, p=0.10, respectively).

Conclusions : Intermittent exotropia patients had significantly lower binocular summation ratio at 1.5 cycles/degree spatial frequency than normal controls. Contrast sensitivity may be useful test for assessing binocular summation ratio status of intermittent exotropia patients.

This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.


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