Alpins Noel, Ong James K Y, Stamatelatos George
From NewVision Clinics (Alpins, Stamatelatos) and Assort (Ong), Melbourne, Victoria, Australia.
From NewVision Clinics (Alpins, Stamatelatos) and Assort (Ong), Melbourne, Victoria, Australia.
J Cataract Refract Surg. 2014 Nov;40(11):1813-27. doi: 10.1016/j.jcrs.2014.02.047. Epub 2014 Oct 23.
To redefine measures of corneal coupling for use with incisional and ablation procedures for astigmatism.
Private clinics, Melbourne, Victoria, Australia.
Retrospective nonrandomized study.
The measures known as the coupling ratio (CR) and coupling constant (CC) were redefined to ensure validity in most cases of incisional procedures and laser vision correction procedures. In addition, a new measure--the coupling adjustment (CAdj)--was developed to quantify the amount of spherical adjustment that must be applied to compensate for coupling that occurs as a result of astigmatism treatment. These quantitative measures of coupling were applied to retrospective data to show their applicability.
Pure myopic, compound myopic, and compound hyperopic astigmatism excimer laser treatments showed a CR close to zero, a CC close to 0.5, and a CAdj close to zero. Incision LRIs showed a CR close to 1.0 and a CC close to zero. In all cases, the coupling measures were consistent for treatments with a larger astigmatic component (>1.0 diopter) but variable when the astigmatic component of the treatment was smaller.
The revised definitions of CR and CC can be used with incisional and ablative surgery. Incorporating the CAdj into the planning of spherocylindrical treatments allows one to factor in the effect of the astigmatic treatment on the spherical component and thus to more accurately target the desired spherical equivalent.
Dr. Alpins and Mr. Stamatelatos have a financial interest in the Assort software program. Dr. Ong is an employee of Assort.
重新定义用于散光的切开手术和消融手术的角膜耦合测量方法。
澳大利亚维多利亚州墨尔本的私人诊所。
回顾性非随机研究。
重新定义了耦合比（CR）和耦合常数（CC）这两种测量方法，以确保在大多数切开手术和激光视力矫正手术中有效。此外，还开发了一种新的测量方法——耦合调整（CAdj），以量化为补偿散光治疗导致的耦合而必须应用的球镜调整量。将这些耦合的定量测量方法应用于回顾性数据，以显示其适用性。
单纯近视、复合近视和复合远视散光准分子激光治疗显示CR接近零，CC接近0.5，CAdj接近零。切口性激光屈光性角膜切开术（LRI）显示CR接近1.0，CC接近零。在所有情况下，对于散光成分较大（>1.0屈光度）的治疗，耦合测量结果是一致的，但当治疗的散光成分较小时则有所不同。
CR和CC的修订定义可用于切开手术和消融手术。将CAdj纳入球柱镜治疗计划中，可以考虑散光治疗对球镜成分的影响，从而更准确地瞄准所需的球镜等效值。
阿尔平斯博士和斯塔马特拉托斯先生在Assort软件程序中有经济利益。翁博士是Assort的员工。
