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目的探讨在坐位及仰卧位人眼球镜度数及散光轴向的改变。设计前瞻性病例系列。研究对象拟行LASIK手术的近视患者52例(96眼),屈光度-2.50D～-10.00 D,散光-0.75D～-4.50 D。方法对所有患者用手持自动验光仪分别测量坐位及仰卧位时的球镜度数、柱镜度数及其轴向,并对坐位及仰卧位球镜度数、柱镜度数及散光轴向的改变进行统计学分析。主要指标球镜、柱镜度数及散光轴。结果仰卧位球镜度数(-5.31±3.43)D与坐位球镜度数(-5.27±3.24)D相比略增高,但差异无统计学意义(P=0.25)。散光度数坐位平均(-2.27±1.24)D,仰卧位平均(-2.35±1.19)D,差异无统计学意义(P=0.20)。眼球散光轴向改变在-16°～+18°之间,其中0°～2°者52.1%,6°～10°者5.2%,>10°者3.1%。散光轴向右眼在旋转方向上更倾向于逆时针旋转,而左眼更倾向于顺时针旋转。结论患者坐位及仰卧位眼球的球镜和柱镜度数无明显变化,但眼球旋转引起的散光轴向改变,可能是影响某些患者LASIK术后效果的主要原因之一。
Objective To investigate the changes of spherical power and axial astigmatism in sitting and supine position. Design prospective case series. Participants 52 patients (96 eyes) with myopia undergoing LASIK surgery, diopter -2.50D ~ -10.00D, astigmatism -0.75D ~ -4.50D. Methods All patients were measured by hand-held automatic refractometer sitting position and supine position of the spherical power, the degree of cylinder and its axial, and sitting and supine spherical power, cylinder power and axial changes in astigmatism statistics Analysis. The main indicators of the spherical lens, the degree of cylinder and axis of astigmatism. Results The degree of spherical position in supine position (-5.31 ± 3.43) D was slightly higher than that in sitting position (-5.27 ± 3.24) D, but the difference was not statistically significant (P = 0.25). The average number of astigmatism (-2.27 ± 1.24) D, supine position average (-2.35 ± 1.19) D, the difference was not statistically significant (P = 0.20). Axial changes in the axial astigmatism between -16 ° ~ +18 °, of which 0 ° ~ 2 ° 52.1%, 6 ° ~ 10 ° 5.2%,> 10 ° 3.1%. The astigmatism axis tends to rotate anticlockwise in the direction of rotation, whereas the left eye is more inclined to rotate clockwise. Conclusions There is no significant change in the spherical or lenticular magnification of the eyes of the patient and the supine position. However, axial changes of the astigmatism caused by the rotation of the eyeball may be one of the main causes of the postoperative LASIK in some patients.