Vicente Diego, Clinch Thomas E, Kang Paul C
Georgetown University School of Medicine, Washington, District of Columbia, USA.
J Cataract Refract Surg. 2008 May;34(5):785-8. doi: 10.1016/j.jcrs.2007.12.040.
To evaluate changes in posterior corneal elevation using the Pentacam topographer (Oculus) in patients having laser in situ keratomileusis (LASIK) enhancement.
Private practice, Chevy Chase, Maryland, USA.
The Pentacam device was used to evaluate the changes in posterior corneal elevation above the best-fit sphere before LASIK enhancement and after LASIK enhancement in 24 eyes. The change in posterior corneal elevation in eyes for which pre-primary LASIK data were available was also evaluated.
After LASIK enhancement, the mean change in posterior corneal elevation was 5 microm. The mean posterior corneal elevation was 12 +/- 7 microm before LASIK enhancement and 16 +/- 6 microm after enhancement; the difference was statistically significant (P = .004). In eyes for which pre-primary LASIK data were available, the mean change in posterior corneal elevation after primary LASIK was 2 microm. The mean posterior corneal elevation was 11 +/- 5 microm before LASIK enhancement and 11 +/- 7 microm after enhancement.
There was a statistically significant difference in posterior corneal elevation between before LASIK enhancement and after LASIK enhancement. However, the change in posterior corneal elevation was much smaller than previously reported values and below the sensitivity of the Pentacam topographer.
使用Pentacam眼前节分析仪（德国Oculus公司）评估接受准分子原位角膜磨镶术（LASIK）增效手术患者的角膜后表面高度变化。
美国马里兰州雪佛兰蔡斯的私人诊所。
使用Pentacam设备评估24只眼睛在LASIK增效手术前和术后角膜后表面相对于最佳拟合球面的高度变化。对于有初次LASIK术前数据的眼睛，也评估其角膜后表面高度的变化。
LASIK增效手术后，角膜后表面高度的平均变化为5微米。LASIK增效手术前角膜后表面平均高度为12±7微米，术后为16±6微米；差异具有统计学意义（P = 0.004）。对于有初次LASIK术前数据的眼睛，初次LASIK术后角膜后表面高度的平均变化为2微米。LASIK增效手术前角膜后表面平均高度为11±5微米，术后为11±7微米。
LASIK增效手术前后角膜后表面高度存在统计学上的显著差异。然而，角膜后表面高度的变化比先前报道的值小得多，且低于Pentacam眼前节分析仪的敏感度。
