Leyland M, Benjamin L
Ophthalmic Unit, Stoke Mandeville Hospital NHS Trust, Aylesbury, Bucks, UK.
Eye (Lond). 1997;11 ( Pt 6):854-7. doi: 10.1038/eye.1997.219.
Pre-operative keratometry was performed on 32 eyes of 32 patients undergoing extracapsular cataract extraction with intraocular lens implantation, for calculation of intraocular lens power. In an additional 20 eyes of 20 patients post-operative keratometry was performed to guide selective suture removal. Readings from a manual keratometer and an automated hand-held keratometer were compared.
Pre-operative measurements were repeated three times on each subject to assess the repeatability of each machine. Mean-difference plots were performed to define the limits of agreement of the two machines.
Repeatability was higher using manual keratometry (MK) than automated keratometry (AK). There was broad agreement between the two machines in pre-operative and post-operative assessment, although clinically significant differences are likely to occur in some cases.
MK should continue to be used for routine pre-operative keratometry, with the AK providing a useful alternative when MK is not possible. AK is sufficiently accurate to allow its use in post-operative assessment of suture-induced astigmatism.
对32例接受白内障囊外摘除联合人工晶状体植入术患者的32只眼进行术前角膜曲率测量，以计算人工晶状体度数。另外对20例患者的20只眼进行术后角膜曲率测量，以指导选择性拆线。比较了手动角膜曲率计和自动手持式角膜曲率计的读数。
对每个受试者的术前测量重复三次，以评估每台仪器的可重复性。绘制平均差异图以确定两台仪器的一致性界限。
手动角膜曲率测量（MK）的可重复性高于自动角膜曲率测量（AK）。两台仪器在术前和术后评估中有广泛的一致性，尽管在某些情况下可能会出现具有临床意义的差异。
MK应继续用于常规术前角膜曲率测量，当无法使用MK时，AK可作为一种有用的替代方法。AK足够准确，可用于术后缝线诱导散光的评估。
