Huerva Valentín, Ascaso Francisco J, Caral Isabel, Grzybowski Andrzej
Department of Ophthalmology, Universitary Hospital Arnau de Vilanova, Avda. Alcade Rovira Roure 80, 25198, Lleida, Spain.
IRB Lleida, Lleida, Spain.
BMC Ophthalmol. 2017 Jul 11;17(1):122. doi: 10.1186/s12886-017-0516-1.
To assess the constants and formula for aphakia correction with iris-claw IOLs to achieve the best refractive status in cases of late in-the-bag IOL complex dislocation.
A literature search was performed. The following data were obtained: Iris-claw IOL model, Iridal or retroiridal enclavation, A-constant, ultrasound or optical biometry, formula employed and refractive outcomes. Acceptable emmetropia was considered if the resulting spherical equivalent (SE) was within ±1.00 D.
The majority of the studies used SRK/T formula (66.6%). The 88.9% of the reports obtained a SE within ±1.00 D. Using A-115 for ultrasound biometry and A-115.7 for optical biometry and SRK/T formula, the emmetropia (±1.00 D) of SE, was able to get near 100% of reported cases over the pupil implantation. However, the emmetropia decreased to 80% when the enclavation is retropupilar using the same formula. The A-constant can vary from 116.7 to 117.5 for retropupilar enclavation.
Using A-115 for ultrasound biometry and A-115.7 for optical biometry and SRK/T formula, ±1.00 D of SE, is able to get near 100% of cases. Nevertheless, ±1.00 D of SE decreased to 80% of the cases when the enclavation is retropupilar.
评估用于无晶状体眼矫正的虹膜爪型人工晶状体的常数和公式，以在晚期囊袋内人工晶状体复合体脱位的病例中实现最佳屈光状态。
进行文献检索。获得了以下数据：虹膜爪型人工晶状体型号、虹膜内或虹膜后固定、A常数、超声或光学生物测量、使用的公式和屈光结果。如果所得球镜等效度（SE）在±1.00 D范围内，则认为是可接受的正视。
大多数研究使用SRK/T公式（66.6%）。88.9%的报告获得的SE在±1.00 D范围内。使用A-115进行超声生物测量，A-115.7进行光学生物测量以及SRK/T公式，在瞳孔植入的情况下，SE的正视（±1.00 D）能够在近100%的报告病例中实现。然而，当使用相同公式且固定在瞳孔后时，正视率降至80%。对于瞳孔后固定，A常数可在116.7至117.5之间变化。
使用A-115进行超声生物测量，A-115.7进行光学生物测量以及SRK/T公式，SE达到±1.00 D时，能够在近100%的病例中实现。然而，当固定在瞳孔后时，SE达到±1.00 D的病例数降至80%。
