Gobin Laure, Rozema Jos J, Tassignon Marie-José
Department of Ophthalmology, University Hospital Antwerp, Edegem, Belgium.
J Cataract Refract Surg. 2008 Aug;34(8):1353-61. doi: 10.1016/j.jcrs.2008.04.023.
To propose a comprehensive classification of anisometropia, a method to calculate the theoretical related aniseikonia (objective aniseikonia) and a purpose-designed eikonometer to measure aniseikonia psychophysically (subjective aniseikonia).
University Hospital Antwerp, Department of Ophthalmology, Edegem, Belgium.
The occurrence of anisometropia was evaluated in 263 patients scheduled for cataract surgery. Subjective aniseikonia was evaluated in 77 healthy patients. The theoretical model was validated to calculate objective aniseikonia by implementing data from the literature. Ultimately, an aniseikogram was developed and its practical use illustrated by 4 clinical cases of anisometropia.
In a population of 263 patients, the total incidence of anisometropia was 7.6%, with a dominance of axial anisometropia. Subjective aniseikonia between 2% and 4% was found in 3.0% to 7.5% of the cases, depending on the refractive error. The correlation coefficient between objective and subjective aniseikonia was good (R(2) = 0.82). Analysis of 4 clinical cases illustrated the calculated preoperative and postoperative aniseikonia in 4 types of anisometropia planned for lens removal.
Anisometropia is not a rare condition and should be assessed before cataract surgery. A comprehensive method to calculate the objective aniseikonia and to measure the subjective aniseikonia in anisometropia was proposed. If cataract surgery is considered in anisometropic patients, a postoperative aniseikonia of 4% or more may be induced in the case of emmetropization. A method to calculate the intraocular lens power resulting in an acceptable postoperative aniseikonia, especially in axial anisometropic patients, is also proposed.
提出一种全面的屈光参差分类方法、一种计算理论相关像不等（客观像不等）的方法以及一种专门设计的用于心理物理学测量像不等（主观像不等）的视网膜像测定仪。
比利时埃代海姆安特卫普大学医院眼科。
对263例计划行白内障手术的患者评估屈光参差的发生情况。对77例健康患者评估主观像不等。通过纳入文献数据对理论模型进行验证以计算客观像不等。最终，绘制了像不等图，并通过4例屈光参差临床病例说明其实际应用。
在263例患者群体中，屈光参差的总发生率为7.6%，以轴性屈光参差为主。根据屈光不正情况，3.0%至7.5%的病例中主观像不等在2%至4%之间。客观像不等与主观像不等之间的相关系数良好（R² = 0.82）。对4例临床病例的分析说明了计划行晶状体摘除的4种类型屈光参差术前和术后计算得到的像不等情况。
屈光参差并非罕见情况，在白内障手术前应进行评估。提出了一种全面的方法来计算屈光参差中的客观像不等并测量主观像不等。如果考虑对屈光参差患者进行白内障手术，在正视化的情况下可能会诱发4%或更高的术后像不等。还提出了一种计算人工晶状体度数的方法，以获得可接受的术后像不等，尤其是在轴性屈光参差患者中。
