Objective To investigate the binocular accommodative function of patients with intermittent exotropia. Methods Seventy-six patients aged 18 to 40 years with intermittent exotropia and 40 normal controls were recruited for a prospective case control study. Accommodative responses in dominant and nondominant eyes were tested using MEM (monocular estimate method) dynamic retinoscopy. The testing measured positive relative accommodation/negative relative accommodation (PRA/NRA) and deviation to a 40 cm target with binocular viewing. The data were analyzed by a nonparametric test, t-test and correlation analysis. Results During binocular viewing at the 40 cm target, the accommodative response was asymetric between the two eyes in patients with intermittent exotropia. Forty-eight of the dominant eyes (63%) showed an accommodative lead. Sixty-two of the nondominant eyes (81%) showed an accommodative lag. The mean accommodative response in the dominant and nondominant eyes in patients and normal control dominant eyes were -0.32±0.57 D, +0.36±0.44 D and +0.34±0.28 D, respectively. The accommodative response was asymetric in patients between dominant and nondominant eyes (Z=-7.01, P<0.01). There was significant difference between the dominant eyes in patients and normal controls (Z=-6.36, P<0.01). The accommodative responses in the dominant eyes were significantly correlated with the angle of exotropia (r=-0.67, P<0.01). The mean PRA was -4.03±0.82 D in patients and -3.09±0.74 D in normal controls (t=6.05, P<0.01). The mean NRA was +1.96±0.56 D in patients and +2.23±0.34 D in normal controls (t=-2.82, P<0.01). Conclusion During binocular viewing at the near target, the accommodative response in patients with intermittent exotropia was asymetric between dominant and nondominant eyes with a hyperactive response in the dominant eye.
王小娟,赵堪兴. 间歇性外斜视的双眼调节功能[J]. 中华眼视光学与视觉科学杂志, 2013, 15(8): 471-474.
WANG Xiao-juan,ZHAO Kan-xing. Binocular accommodative function in patients with intermittent exotropia. Chinese Journal of Optometry Ophthalmology and Visual Science, 2013, 15(8): 471-474. DOI: 10.3760/cma.j.issn.1674-845X.2013.08.006
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