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Ken Kakeue, Miharu Mihara, Atsushi Hayashi; Utility of a cheiroscope to test simultaneous perception and fusion. Invest. Ophthalmol. Vis. Sci. 2020;61(7):5088.
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© ARVO (1962-2015); The Authors (2016-present)
The examinations of simultaneous perception and fusion using a synoptophore are often difficult in patients with strabismus, particularly young children, despite their importance before a strabismus surgery. Cheiroscopic tracing, which requires fusion and simultaneous perception, is used in young children for training of binocular vision function. The aim of this study was to investigate the utility of cheiroscopic tracing to test simultaneous perception and fusion.
The participants had a visual acuity of over 0.0 logarithm of the minimum angle of resolution (logMAR), and no history of amblyopia or neurological or musculoskeletal diseases. The study included 33 patients with strabismus, who could perform cheiroscopic tracing. Square line drawings of two sizes (20° and 6°) were used for cheiroscopic tracing. Patients were required to trace two pictures with each eye. We determined that patients had no simultaneous perception or fusion when they could not trace the pictures. Patients were categorized under two groups: intermittent exotropia (XT; n = 19; mean age, 9.8 ± 5.6) and esotropia (ET; n = 14; mean age, 10.2 ± 6.0). In addition, all patients were examined for simultaneous perception and fusion using a synoptophore. We compared the results of cheiroscopic tracing with those of synoptophore testing for simultaneous perception and fusion.
Using a synoptophore, simultaneous perception was detected in 89.5% and 85.7% cases of the XT and ET groups, respectively, and fusion was detected in 73.7% and 71.4% cases of the XT and ET groups, respectively. Simultaneous perception or fusion did not differ significantly between the two groups. Seven patients with XT and four patients with ET had no simultaneous perception or fusion in the synoptophore test. Among those patients, six with XT were associated with suppression and two with ET were four years of age.
Eleven patients, who were detected with no simultaneous perception or fusion using a synoptophore, were included in this study. Cheiroscopic tracing was useful for checking the presence of simultaneous perception and fusion in these patients.
This is a 2020 ARVO Annual Meeting abstract.
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