儿童人工晶状体屈光力的计算

Pediatric introcular lens power calculation

选择准确合适的人工晶状体是儿童白内障手术的关键，儿童人工晶状体屈光力的计算存在较大的预测误差，这是由测量误差和人工晶状体计算公式误差造成的，所以恰当地选择各类测量仪器和人工晶状体计算公式很重要。Holladay2公式对短眼轴患儿计算人工晶状体数值更准确。应用该公式时，需要测量7个参数，即角膜白到白直径、晶状体厚度、眼轴长、角膜屈光力、术前前房深度、术前屈光状态及年龄。该公式一定程度上实现了人工晶状体屈光度数计算的个性化，但所需参数多，对患儿配合要求高。另外，随着年龄的增长以及眼球的发育成熟儿童眼睛屈光度仍会改变，所以我们还应选择正确的术后屈光目标。

To choose accurate and appropriate intraocular lens（IOL） is a major challenge of pediatric cataract surgery. Pediatric IOL power calculation suffers from significant prediction errors, which is caused by measurement errors and the IOL calculation formula errors. So it is very important to make a choice of measuring instruments and IOL calculation formula. Compared with the other formulas, the Holladay2 formula had the most accurate calculation outcome for the short axial children. Seven parameters （ white to white cornea diameter, lens thickness, axial length, corneal refractive power, anterior chamber depth, preoperative refraction, age） will be measured for the Holladay2. To some extent, the formula achieves the personalized IOL power calculation, but the formula requires the children have enough cooperation. Along with the growth of the eyeball, the diopter of pediatric eye will change, we should choose correct postoperative refractive target.