Background: The aim was to assess the impact of 5- and 10-degree rotations in the optical quality of a trifocal toric intraocular lens with different amounts of cylinder.

Methods: Two Physiol Toric intraocular lenses with 1.5 and 3.0 D of cylinder were analysed in three different positions: centred, 5 and 10 degrees rotated. The optical quality of the intraocular lenses was evaluated with the PMTF optical bench through specific perpendicular targets. The analysis was performed by the through-focus modulation transfer function curves and the modulation transfer function corresponding to distance vision (0 D of vergence).

Results: For a centred situation, the through-focus modulation transfer function curves of both intraocular lenses showed the classical three peaks corresponding to the powers of the two principal meridians of the intraocular lenses. When 5 and 10 degrees of rotation were induced, the three peaks were attenuated in both cases. The case with the intraocular lens with 3.0 D of cylinder and 10 degrees of rotation showed the worst optical quality and a significant loss of trifocality. The modulation transfer function values obtained for distance vision also showed the worst optical quality for the intraocular lens with 3.0 D of cylinder and 10 degrees of rotation.

Conclusion: Rotations over 5 degrees decreased the optical quality of trifocal toric intraocular lenses, being this reduction moderate from 5 to 10 degrees for low levels of cylinder (≤1.5 D). For mid-high levels of cylinder (≥3.0 D), rotations over 5 degrees cause a significant loss of optical quality at all object distances.

背景：目的是评估 5 度和 10 度旋转对具有不同柱面量的三焦点复曲面人工晶状体的光学质量的影响。

方法：在三个不同位置分析了两个 Physiol Toric 人工晶状体，柱面为 1.5 和 3.0 D：居中、旋转 5 度和 10 度。通过特定的垂直目标，使用 PMTF 光学平台评估人工晶状体的光学质量。通过离焦调制传递函数曲线和对应于远距离视觉（聚散度为 0 D）的调制传递函数进行分析。

结果：在居中情况下，两个人工晶状体的离焦调制传递函数曲线显示经典的三个峰值对应于人工晶状体的两个主子午线的屈光度。当引起 5 度和 10 度旋转时，这两种情况下的三个峰都减弱了。具有 3.0 D 柱面和 10 度旋转的人工晶状体的情况显示出最差的光学质量和显着的三焦点损失。对于远视获得的调制传递函数值也显示出具有 3.0 D 柱面和 10 度旋转的人工晶状体的最差光学质量。

结论：旋转超过 5 度会降低三焦复曲面人工晶状体的光学质量，对于低水平柱面（≤1.5 D），这种降低从 5 度到 10 度适度。对于中高水平的圆柱体 (≥3.0 D)，超过 5 度的旋转会导致所有物距处的光学质量显着下降。