Na Kyung-Sun, Savini Giacomo, Whang Woong-Joo, Næser Kristian
Department of Ophthalmology, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul 16247, Republic of Korea.
IRCCS-G.B. Bietti Foundation, 00184 Rome, Italy.
Diagnostics (Basel). 2023 Dec 18;13(24):3687. doi: 10.3390/diagnostics13243687.
To analyse the correspondence between refractive astigmatism and corneal astigmatism in pseudophakic eyes with non-toric intraocular lenses.
Yeouido St. Mary hospital, Seoul, Republic of Korea.
Evaluation of a diagnostic test instrument.
This retrospective study included 95 eyes of 95 patients. Corneal astigmatism was measured with an automated keratometer (RK-5, Canon) and Scheimpflug tomography (Pentacam HR, Oculus). Refractive astigmatism was compared to keratometric astigmatism (based on anterior corneal measurements only), equivalent K-reading, and total corneal astigmatism (both based on anterior and posterior corneal measurements). Vector analysis was carried out by Næser's polar value method. The accuracy was defined as the average magnitude of the vectorial difference in astigmatism (DA). Each corneal measurement was optimized in retrospect by a multiple linear regression equation between refractive and corneal astigmatism.
Keratometric astigmatism overestimated with-the-rule (WTR) refractive astigmatism and underestimated against-the-rule (ATR) refractive astigmatism. Several measurements based on both corneal surfaces' values did not show any statistically significant difference with respect to refractive astigmatism. The mean corneal astigmatism by total corneal refractive power (TCRP) at 4.0 mm (zone/pupil) produced the lowest mean arithmetic DA and the highest percentage of eyes with a DA ≤ 0.50 dioptre. After optimization, the accuracies of automated KA and TCRP 4.0 mm (zone/pupil) were similar.
Total corneal astigmatism measured by Scheimpflug tomography at a 4.0 mm zone centered on the pupil accurately reflects the refractive astigmatism in pseudophakic eyes. However, the accuracy of total corneal astigmatism is not different from automated KA after optimization.
分析植入非散光型人工晶状体的假晶状体眼中屈光性散光与角膜散光之间的相关性。
韩国首尔汝矣岛圣玛丽医院。
诊断测试仪器的评估。
这项回顾性研究纳入了95例患者的95只眼。使用自动角膜曲率计（RK-5，佳能）和眼前节分析系统（Pentacam HR，欧科路）测量角膜散光。将屈光性散光与角膜曲率性散光（仅基于角膜前表面测量）、等效角膜曲率读数以及总角膜散光（基于角膜前表面和后表面测量）进行比较。采用内塞尔极坐标法进行矢量分析。准确性定义为散光矢量差异（DA）的平均大小。通过屈光性散光与角膜散光之间的多元线性回归方程对每次角膜测量进行回顾性优化。
角膜曲率性散光高估了顺规（WTR）屈光性散光，低估了逆规（ATR）屈光性散光。基于角膜两个表面值的几种测量与屈光性散光相比均未显示出任何统计学上的显著差异。在4.0mm（区域/瞳孔）处通过总角膜屈光力（TCRP）计算的平均角膜散光产生的平均算术DA最低，且DA≤0.50屈光度的眼所占百分比最高。优化后，自动角膜曲率计和4.0mm（区域/瞳孔）处的TCRP的准确性相似。
以瞳孔为中心在4.0mm区域通过眼前节分析系统测量的总角膜散光准确反映了假晶状体眼中的屈光性散光。然而，优化后总角膜散光的准确性与自动角膜曲率计并无差异。
