Objective To study the correlation between the stimulus and response AC/A ratios by measuring a patient′s accommodative lag and eye position using different stimuli to induce accommodation. Methods A cross-sectional study was used. Twenty-nine myopic college students(average age 23.3±3.8) were randomly selected for the study. Phoria was measured at distances of 40 cm and 5 m by prism separation when wearing full correction. Phoria was measured again at a distance of 40 cm after adding spherical lenses of +1.00 D, +1.50 D, -1.00 D and -2.00 D. Accommodative lag was then measured with each lens power by the monocular estimation method using dynamic retionscopy. Finally, the data were analyzed by a rank-sum test. Results There were statistically significant differences between accommodative lag and gradient response and stimulus AC/A ratios when different accommodative stimuli were used (x²=116.85, 8.992, 17.319, P<0.05). The correlation coefficients between response and stimulus AC/A ratios based on the gradient method were 0.542(P<0.01), 0.789(P<0.01),and 0.812(P<0.01) with added lenses of +1.00 D, -1.00 D, -2.00 D. And the correlation coefficient between response and stimulus AC/A ratios based on the calculation method was 0.859(P<0.01). Conclusion A subject has less accommodative response and more accommodative lag with minus spherical addition than with a plus spherical addition lens. The correlation between stimulus and response AC/A ratios is highest when using a calculation method.
张艳龙,高祥璐,王琦,石浩淼,高飞,刘洵. 动态检影法下近视患者反应性与刺激性AC/A[J]. 中华眼视光学与视觉科学杂志, 2013, 15(7): 436-438.
ZHANG Yan-long,GAO Xiang-lu,WANG Qi,SHI Hao-miao,GAO Fei,LIU Xun. An investigation of stimulus and response AC/A ratios in myopia based on MEM dynamic retinoscopy. Chinese Journal of Optometry Ophthalmology and Visual Science, 2013, 15(7): 436-438. DOI: 10.3760/cma.j.issn.1674-845X.2013.07.013
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