Evaluation Of Toric Iol Axis Using Itrace Aberrometry And Ss‑Oct Iol Topography Under Small And Dilated Pupil Conditions
Published 2026 - 44th Congress of the ESCRS
Reference: FP05.14 | Type: Free paper | DOI: 10.82333/7005-z040
Authors: Xu Chen* 1 , Dr Jiali Ji 2 , Dr Dejian Xu 2
1Ophthalmology,Shanghai Tongren Hospital,Shanghai,China;Ophthalmology,Shanghai General Hospital,Shanghai,China, 2Ophthalmology,Shanghai Tongren Hospital,Shanghai,China
Purpose
To evaluate postoperative toric intraocular lens (IOL) axis measurements obtained using iTrace aberrometry and a novo IOL topography software for swept‑source OCT (SS‑OCT) under small‑ and dilated‑pupil conditions, using dilated‑pupil slit‑lamp photography as the reference standard.
Setting
Shanghai Tongren Hospital, Shanghai, China.
Methods
Postoperative toric intraocular lens (IOL) axis measurements were collected using three modalities: diluted pupil slit‑lamp photography (reference), iTrace aberrometry (Tracey Technologies) (small pupil n=13; dilated pupil n=10), and novo SS‑OCT IOL Topography (Intalight )(small pupil n=15; dilated pupil n=14). Toric IOLs from Zeiss and Johnson & Johnson (J&J) were included. Absolute measurement error relative to the photographic axis was categorized into ≤5°, ≤10°, ≤20°, and >20°. Cumulative distributions and eye counts were compared across modalities and pupil conditions to assess the dispersion of measurement error.
Results
iTrace under dilation showed the narrowest measurement error distribution, with 50% of eyes within ≤5°, 70% within ≤10°, and 90% within ≤20°. Under small pupils, iTrace showed moderate dispersion (38.5% ≤5°, 53.8% ≤10°, 69.2% ≤20°). Intalight SS‑OCT Novo‑IOL Topography under small pupils showed the widest dispersion (13.3% ≤5°, 26.7% ≤10°, 66.7% ≤20°, 33.3% >20°). With dilation, SS‑OCT performance improved (14.3% ≤5°, 50% ≤10°, 78.6% ≤20°), though measurement error remained broader than iTrace. Across modalities, dilation reduced measurement error, with the greatest improvement observed in iTrace.
Conclusions
Measurement error varied across modalities and pupil conditions. iTrace aberrometry under dilation provided the most consistent toric IOL axis evaluation. Intalight SS‑OCT novo IOL Topography function showed improved performance with dilation, and as a newly developed technology undergoing ongoing algorithm refinement, it may further enhance its value for toric axis measurement.