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目的 分析 A、B超联合法测眼轴计算高度近视眼并发白内障人工晶状体度数的准确性。方法 根据测得的眼轴长度把所有病例分为三组 :(1)眼轴长 2 6～ 2 8m m组 :11只眼 ;(2 )眼轴长 >2 8～ 30 mm组 :15只眼 ;(3)眼轴长 >30 mm组 :17只眼。另选择眼轴为 2 3～ 2 4 m m的 15只眼作为对照 ,用两种方法测量眼轴计算人工晶状体度数。方法一 :A、B超联合测法。首先用 A超测量眼轴 ,探头轻轻置于瞳孔中央与角膜顶点的切线垂直。系统自动重复测量十次。取前房深度及晶状体厚度的平均值之和定为 DA。再行 B超检查 ,观察轴位图。用 B超上的 A超测量尺测量后囊中心到视乳头颞侧 3m m中心凹处的距离 ,值定为 DB。DA+DB即为 A、B超联合测量方法测得的眼轴长度。方法二 :单纯 A超测量法 ,即直接使用 A超测量眼轴长度。采用 SRK 公式计算出所需的人工晶状体度数。结果 A、B超联合测量法为 :术后 3个月实际屈光度与预计屈光度的差值在眼轴长 2 6～ 2 8mm组为 0 .2 3±0 .4 5 D;眼轴长 >2 8～ 30 mm组为 - 0 .35± 0 .5 9D;眼轴长 >30 mm组为 - 0 .5 9± 0 .79D。单纯用 A超测量法结果为 :眼轴长 2 6～ 2 8mm组为 0 .4 5± 0 .90 D;眼轴长 >2 8～ 30 mm组为 0 .97± 1.2 7D;眼轴长 >30 mm组为 1.4 5± 2 .0 4 D。经 t检?
Objective To analyze the accuracy of calculating the degree of cataract with intraocular lens in high myopia by A and B supercoupling method. Methods All cases were divided into three groups based on the measured axial length: (1) group with axial length of 26 ~ 28m and group of 11 eyes; (2) axial length> 28 ~ 30mm group: 15 Eye; (3) axial length> 30 mm group: 17 eyes. Another 15 eyes with axial length of 23 ~ 24 m were selected as the control, and two methods were used to measure the axial length of the intraocular lens. Method One: A, B super-joint test. First of all, with the A-measure axial, the probe gently placed in the center of the pupil and corneal vertex perpendicular to the tangent. The system automatically repeats the measurement ten times. Take the sum of the depth of the anterior chamber and the average thickness of the lens as DA. B-check again, observe the axial map. The distance between the center of the posterior capsule and the 3 m center of the temporal papillae was measured with an A-over-B measuring scale. The value was defined as DB. DA + DB is the axial length measured by A and B super-united measurement methods. Method 2: A simple measurement method, that is, the direct use of A-measurement axial length. The SRK formula was used to calculate the required degree of intraocular lens. Results The combined measurement of A and B showed that the difference between the actual refractive power and the expected refractive power at 3 months after operation was 0.23 ± 0.45D at the axial length of 26 to 28 mm and the axial length was> 2 The 8-30 mm group was -0.35 ± 0.59 D, and the axial length> 30 mm group was -0.59 ± 0.79 D. A simple measurement with the results as follows: the axial length of 26 ~ 28mm group was 0.45 ± 0.90 D; axial length> 28 ~ 30mm group was 0.97 ± 1.2 7D; axial length The group> 30 mm is 1.4 5 ± 2 .0 4 D. After t test?