长眼轴白内障患者人工晶状体计算公式研究进展

Research of intraocular lens power calculation in cataract surgery for high myopia

高度近视由于眼轴延长可导致诸多病理性改变是致盲的主要原因之一。长眼轴患者并发白内障时间较早，进展较快，手术时植入的人工晶状体度数是否适合是长眼轴白内障患者术后视觉质量恢复的重要影响因素。以往长眼轴白内障患者预测植入人工晶状体度数时，由于人工晶状体计算公式的不适用以及后巩膜葡萄肿的存在，术后距离目标屈光度的误差相对较大。随着人工晶状体度数计算公式的更新换代，A常数引入了更多的变量，能更好地评估眼部生物数据，从而使得长眼轴白内障患者人工晶状体度数的预测变得更为可靠。Haigis 公式在长眼轴白内障患者预测人工晶状体度数较以往第三代人工晶状体度数计算公式更为准确，目前对于Holladay 2公式准确性是否高于其他第三代公式尚无定论。

High myopia is due to the gradual increase of diopter and the continuous extension of the eye axis, which leads to many pathological changes and the progressive decline of visual function. Patients with long axis eyes were more vulnerable to cataracts. With the updating of the IOL calculation formula, the A constant introduces more variables to better evaluate ocular biological datas. Cataract surgery is not only sight restoring surgery, but also refractive surgery. Suitable Intraocular lens （IOL） calculation formulas is very important to the postoperative visual quality. The Haigis formula was more accurate to predicting intraocular lens in long axis cataract than third generation formula. At present, it is still undecided whether the Holladay 2 formula was more accurate than the other third generation formulas.