Black Mammoth Surgical, Carrera 43 # 29 - 35, Office 712., Medellín, Colombia.
Department of Ophthalmology, Universidad CES, Medellín, Colombia.
Int Ophthalmol. 2023 Nov;43(11):4087-4096. doi: 10.1007/s10792-023-02826-8. Epub 2023 Aug 7.
Ocular residual astigmatism (ORA) is defined as the difference between refractive astigmatism and anterior corneal astigmatism. A high ORA may be correlated with poorer results in patients undergoing corneal-based laser surgery. Is a high baseline refractive error related to a higher degree of ORA?
This was a retrospective analytical study including 181 right eyes of an equal number of refractive surgery candidates. Manifest subjective refraction was measured, along with a Pentacam AXL Wave corneal tomography. Via a vector analysis with this methodology, subjective cylinder was translated into the corneal plane and a vectorial subtraction was performed in order to measure ORA. Spearman's rank order test, one-way ANOVA and Chi-square were used to determine whether different levels of baseline refractive error correlate with different levels of ORA.
Mean age was 28.33 ± 4.71 years with a female preponderance (65.7%). Mean ORA was 0.74 ± 0.39 D, with 33.1% of eyes having an ORA ≥ 0.90 D. There was not a correlation between ORA and level of myopia (rho = - 0.022; p = 0.764), nor between ORA and spherical equivalent (rho = 0.009; p = 0.903). Refractive astigmatism did not demonstrate to be correlated with ORA level either (rho = 0.078; p = 0.329). One-way ANOVA tests failed to demonstrate an association between different classifications of refractive error and level of ORA.
In the studied population, ORA is not correlated with baseline refractive error. Every patient presenting for possible corneal-based laser refractive surgery should be evaluated for a possible high level of ORA, irrespective of their baseline ametropia level.
眼内残余散光（ORA）定义为屈光性散光与前角膜散光之间的差异。高 ORA 可能与接受角膜激光手术的患者的结果较差相关。高基线屈光不正是否与更高程度的 ORA 相关？
这是一项回顾性分析研究，包括 181 名屈光手术候选者的 181 只右眼。测量了明显的主观折射，并进行了 Pentacam AXL Wave 角膜断层扫描。通过这种方法的向量分析，将主观圆柱转换到角膜平面，并进行向量减法，以测量 ORA。使用 Spearman 等级相关检验、单因素方差分析和卡方检验来确定不同水平的基线屈光不正是否与不同水平的 ORA 相关。
平均年龄为 28.33±4.71 岁，女性居多（65.7%）。平均 ORA 为 0.74±0.39 D，其中 33.1%的眼睛的 ORA≥0.90 D。ORA 与近视程度之间没有相关性（rho=-0.022；p=0.764），也与等效球镜之间没有相关性（rho=0.009；p=0.903）。屈光性散光也与 ORA 水平没有相关性（rho=0.078；p=0.329）。单因素方差分析检验未能证明不同分类的屈光不正与 ORA 水平之间存在关联。
在研究人群中，ORA 与基线屈光不正无关。每个可能接受角膜激光屈光手术的患者都应评估可能存在的高水平 ORA，而与他们的基线屈光不正水平无关。
