Rotational Stability After Implantation of an Aspheric Toric Monofocal IOL with a Double C-Loop Haptic Design in
Robert Edward T Ang1, Pedro Tañá-Rivero2, Francisco Pastor-Pascual3
1Asian Eye Institute, Makati City, Philippines.
Purpose:
This study focuses on the analysis of the rotational stability after implantation of a biconvex aspheric toric monofocal intraocular lens (IOL) with a double C-loop haptic-design in eyes with normal versus high axial lengths.
Methods:
This was a prospective comparative study including 150 eyes with corneal astigmatism (≥0.75D) implanted with the biconvex aspheric monofocal PODEYE toric IOL and assessed up to 1 year after surgery. From these 150 eyes, 81 and 69 eyes belonged to normal (≤23.9mm) and high (≥24mm) axial lengths, respectively. About 4-6 and 11-13 months postoperatively, refraction and rotational stability of the PODEYE toric IOL were evaluated to find possible differences among both groups.
Results:
At the last postoperative-visit, 74.07% of eyes were within ±0.50D and 95.06% of eyes were within ±1.00D of the target-refraction for the normal group and 92.75% and 100% for the high axial length group, respectively. For the normal group, 77.78% and 96.30% of eyes had a postoperative refractive cylinder of ≤0.50D and ≤1.00D, respectively; and for the high axial length group these percentages were 84.05% and 100%, respectively. About 81.84% of eyes in the normal and 94.20% of eyes in the high axial length group were <5 degrees of the intended axis. The mean IOL rotation was 2.93 ± 2.48 degrees in the normal axial length group, and 2.17 ± 1.73 degrees in the high axial length group. Based on the mixed ANOVA results, there is no evidence of a significant difference in IOL rotation over time, nor is there evidence that axial length plays a statistically significant role in rotational stability between 4-6 and 11-13 months postsurgery. Both groups exhibited similar and stable rotation outcomes.
Conclusion:
Our results reveal that the biconvex aspheric monofocal PODEYE toric IOL with double C-loop haptic-design shows excellent rotational stability without significant differences between eyes with normal and high axial lengths.
Related Concept Videos
01:16Eccentric Axial Loading in a Plane of Symmetry
01:10Deformation in a Circular Shaft
01:15Unsymmetric Bending - Angle of Neutral Axis
When a bending moment is applied at an angle θ concerning the vertical axis of a symmetrical member, it can be resolved into components along the member's principal...
01:05Mechanism of Ciliary Motion
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
01:20Normal Strain under Axial Loading
01:11Rotation of Asymmetric Top
The relationship between the angular momentum of any rigid body and its angular velocity, both of which are vectors, involves the moment of inertia. The moment of inertia is a scalar quantity only for spherically symmetric...