Evaluation Of Tolerance To Defocus With A Biaspheric Monofocal Intraocular Lens
Published 2026 - 44th Congress of the ESCRS
Reference: POCAT422 | Type: Free paper | DOI: 10.82333/gs7x-2a52
Authors: Prof. Dr Yih-Shiou Hwang 1 , Prof. Dr Alejandro Cerviño* 2
1Ophthalmology,Chang Gung Memorial Hospital,Linkou and Taipei,Taiwan;Ophthalmology,Chang Gung University,Taoyuan,Taiwan, 2Optics & Optometry & Vision Sciences,University of Valencia,Valencia,Spain
Purpose
To evaluate tolerance to residual refractive error and monocular through-focus visual performance of the Asqelio™ intraocular lens (IOL) three months after cataract surgery
Setting
Chang Gung Memorial Hospital, Linkou, Taipei and Taoyuan, Taiwan
Methods
Thirty eyes implanted with the Asqelio™ IOL were evaluated three months postoperatively. Monocular distance-corrected defocus curves were obtained under photopic conditions from +2.00 to −4.00 diopters (D) in 0.50 D steps to simulate residual refractive error. Visual acuity was measured using Landolt C optotypes and converted to Sloan-equivalent values to enable standardized comparison and interpretation. Corrected distance visual acuity (CDVA) was also recorded.
Results
The Asqelio™ IOL showed a clear peak of best visual acuity at plano defocus, followed by a gradual and smooth decline with increasing defocus. After optotype conversion, visual acuity remained ≤0.20 logMAR within approximately ±1.15 D of defocus, indicating substantial tolerance to residual refractive error. The defocus profile demonstrated a forgiving behavior compared with the steeper visual decline typically reported for conventional monofocal IOLs. Corrected distance visual acuity at 3 months was excellent, and no clinically relevant visual disturbances were observed.
Conclusions
The Asqelio™ IOL demonstrates high tolerance to residual refractive error, maintaining functional visual acuity across a clinically meaningful range of defocus while preserving excellent distance performance. This forgiving through-focus behavior may help mitigate the impact of small postoperative refractive inaccuracies and supports its use in patients where refractive robustness is desirable following cataract surgery.