Mallen Edward A H, Kashyap Priti, Hampson Karen M
Department of Optometry, University of Bradford, Richmond Road, Bradford, West Yorkshire, United Kingdom.
Invest Ophthalmol Vis Sci. 2006 Mar;47(3):1251-4. doi: 10.1167/iovs.05-1086.
To measure the degree of transient axial elongation during the accommodation response in emmetropic and myopic young adults. To evaluate the effect of refractive error and accommodative demand on transient axial elongation of the eye.
Axial length of the right eye was measured in 30 emmetropes and 30 myopes, by using the IOLMaster (Carl Zeiss Meditec, Inc., Dublin, CA), while accommodative stimuli of 0, 2, 4 and 6 D were presented with a Badal optometer.
Axial length increased in both emmetropic and myopic subjects during short periods of accommodative stimulation. Greater transient increases in axial length were observed in myopic than in emmetropic subjects. The mean axial elongation with a 6-D stimulus to accommodation was 0.037 mm in emmetropes and 0.058 mm in myopes (P = 0.02). The degree of transient axial elongation correlated well with the stimulus to accommodation in emmetropes and myopes. Anterior chamber depth decreased, on average, by 0.19 mm in emmetropes and 0.18 mm in myopes when observing a 6-D stimulus to accommodation.
During relatively short periods of accommodative stimulation, axial length increases in both emmetropic and myopic young adults. At higher levels of accommodative stimulation, a significantly greater transient increase in axial length is observed in myopic subjects than in their emmetropic counterparts.
测量正视和近视年轻成年人在调节反应过程中的瞬态轴向伸长程度。评估屈光不正和调节需求对眼睛瞬态轴向伸长的影响。
使用IOLMaster（卡尔蔡司医疗技术公司，加利福尼亚州都柏林）测量30名正视者和30名近视者右眼的眼轴长度，同时使用巴德尔验光仪施加0、2、4和6 D的调节刺激。
在短期调节刺激期间，正视和近视受试者的眼轴长度均增加。近视受试者的轴向长度瞬态增加幅度大于正视受试者。正视者在6 D调节刺激下的平均轴向伸长为0.037 mm，近视者为0.058 mm（P = 0.02）。正视和近视受试者的瞬态轴向伸长程度与调节刺激密切相关。在观察6 D调节刺激时，正视者的前房深度平均减少0.19 mm，近视者平均减少0.18 mm。
在相对较短的调节刺激期间，正视和近视年轻成年人的眼轴长度均增加。在较高水平的调节刺激下，近视受试者的轴向长度瞬态增加幅度明显大于正视受试者。
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