Rotational Stability Of A Monofocal Biaspheric Toric Design With Large Haptic Contact Angle: A Prospective Study
Published 2026 - 44th Congress of the ESCRS
Reference: POCAT655 | Type: Free paper | DOI: 10.82333/38jr-s670
Authors: Dr Santiago Tañá-Sanz* 1 , Dr Pedro Tañá-Sanz 1 , Dr Marta Ibarz-Barberá 2 , Dr Paz Orts-Vila 1 , Dr Francisco Pastor-Pascual 3 , Dr Enrique Artiaga-Elordi 1 , Dr José J. Muñoz 1 , Dr Pedro Tañá-Rivero 1
1Oftalvist,Alicante,Spain, 2Oftalvist,Madrid,Spain, 3Oftalvist,Valencia,Spain
Purpose
To evaluate the rotational stability and alignment accuracy of a monofocal biaspheric toric intraocular lens (IOL) featuring a large haptic contact angle over a 3-month follow-up. The study aimed to differentiate between primary intraoperative alignment error and true postoperative rotational change, and to quantify final misalignment relative to the intended axis after exclusion of statistical outliers.
Setting
Oftalvist clinics in Alicante, Valencia and Madrid, Spain.
Methods
Eyes undergoing cataract surgery with implantation of the Asqelio toric IOL (AST VisionCare) were evaluated at postoperative Day 1 (D1), Week 1, Month 1 and Month 3 (M3). Intended axis was obtained from the surgical plan. IOL orientation was recorded at each visit. Angular differences were calculated using minimal angular distance. Final misalignment was defined as the absolute difference between M3 axis and intended axis. Primary alignment error was defined as D1 versus intended axis and secondary rotation as D1 to M3 axis change. Visual acuity (UDVA, CDVA) and manifest refraction were assessed at each visit.
Results
Eighty-five eyes had complete D1 and M3 data. Mean final misalignment at M3 was 3.4°; 77.8% of eyes were within 5° and 96.3% within 10° of intended alignment. Primary alignment error at D1 averaged 3.9°, while true postoperative rotation from D1 to M3 averaged 1.7°, with 98.7% remaining within 5°. At M3, mean residual refractive cylinder was 0.53D, approximately 93% of eyes were within ±0.50D of target spherical equivalent and 98% within ±1.00D. Median CDVA was 0.0 logMAR.
Conclusions
The monofocal biaspheric toric IOL with large haptic contact angle demonstrated excellent rotational stability, with minimal secondary rotation over 3 months. Final axis deviation was largely attributable to initial surgical alignment rather than postoperative instability. Refractive predictability was high, with low residual astigmatism and excellent corrected visual acuity. The mechanical design appears to provide stable capsular bag fixation and reliable astigmatic correction in routine cataract surgery.