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目的 评价计算准分子激光角膜切削术（ＰＲＫ） 矫正近视性屈光不正的角膜屈光力变化量的Ｈｏｌｌａｄｙ 法。 方法 用Ｈｏｌｌａｄａｙ 法计算ＰＲＫ 术后与术前角膜屈光力的差值（ 角膜实矫屈光度） ，并与角膜预矫屈光度进行比较。 结果 （１）Ａ 组：复性近视散光眼术后６ 个月，角膜实矫球镜度欠矫（０ ．４８ ±０ ．１９）Ｄ；角膜实矫散光度过矫３８ ．５ ％ （２５／６５） ，散光欠矫６１ ．５ ％ （４０／６５） ，过矫和欠矫≥±０ ．５０ Ｄ 占４１ ．５ ％ （２７／６５） ；实矫与预矫散光的轴位的差值≤±１５°占６０ ．０ ％ （３９／６５） 。（２）Ｂ 组：单纯近视眼术后６ 个月时，角膜实矫等值球镜度欠矫（０ ．５５ ±０ ．２６） Ｄ；术后６ 个月时产生（０ ．５９ ±０ ．３８）Ｄ 的矫正近视散光的效应，其中≥０ ．５０ Ｄ 者占５１ ．２ ％ （２２／４３） ，实矫近视散光轴位均在１８０°－ ４４°～１８０°＋ ４４°之间。 结论 应用Ｈｏｌｌａｄａｙ 公式从球、柱镜度两方面计算ＰＲＫ 的角膜屈光变化效应值，是合理、客观和准确的
Objective To evaluate Hollady’s method of calculating the amount of corneal refractive power of PRK corrected by myopia laser keratomileusis (PRK). Methods The difference of postoperative PRK and preoperative corneal refractive power (corneal real refraction diopter) was calculated by Holladay method and compared with that of corneal preconditioning. Results (1) Group A: 6 months after refraction myopic astigmatism, corneal real sphericity undercorrection (0.48 ± 0.19) D; 5% (25/65), astigmatism less correction 61. 5% (40/65), overcorrection and undercorrection≥ ± 0. 50 D accounted for 41. 5% (27/65). The difference between the axis of actual light and preconditioned light ≤ ± 15 ° accounted for 60%. 0% (39/65). (2) Group B: At 6 months after surgery, corneal real correction spherical equivalent was undercorrected (0.55 ± 0.26) D; at 6 months postoperative (0 .59 ± 0 .38) D correction of myopic astigmatism effect, where ≥ 0. 50 D accounted for 51. 2% (22/43), real astigmatism astigmatism axial position between 180 ° - 44 ° ~ 180 ° +44 °. Conclusions It is reasonable, objective and accurate to calculate the corneal refractive effect of PRK from the sphere and cylinder using the Holladay formula