Association between axial length and toric intraocular lens rotation according to an online toric back-calculator
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Jennifer L. Patnaik. Department of Ophthalmology, University of Colorado School of Medicine, Mail Stop F731, 1675 Aurora Court, Aurora, CO 80045, USA. Jennifer.Patnaik@cuanschutz.edu

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Berdahl JP is an owner of OSD, Inc., makers of astigmatismfix.com and consults with Alcon, Johnson and Johnson, Bausch and Lomb, Ocular Surgical Data, and Zeiss; Hardten DR reports grants from OSD, Inc.; Kahook MY is a consultant to Alcon and receives patent royalties from Alcon, New World Medical, and Johnson and Johnson Vision.

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    Abstract:

    AIM: To assess the relationship between axial length (AL) and intraocular lens (IOL) rotation among eyes receiving a toric IOL and subsequently entered into an online toric back-calculator database. METHODS: Retrospective analysis of data collected online via astigmatismfix.com, a freely available online toric back-calculator where surgeons enter pre- and post-operative information to help manage residual postoperative astigmatism. Included records were deemed valid with entry of AL and IOL orientation between January 2017 and March 2019. Rotation was determined by a difference of ≥5° between pre-operative intended IOL orientation and actual post-operative IOL orientation. Frequency and magnitude of rotation are presented with means and associated standard deviation (SD). Linear regression models of this association are presented. RESULTS: Records of 6752 eyes were included in the analysis, of which 74.8% were determined to have a rotated IOL. The magnitude of rotation increased with each millimeter (mm) increase in AL with a mean rotation of 13.3° (SD: 12.8°) for eyes with AL 20-20.9 mm and a maximum mean rotation of 30.6° (SD: 30.3°) among eyes with AL 29-29.9 mm. General linear modeling demonstrated a significant association (P<0.0001) with a parameter estimate of 1.19 (standard error: 0.159) and R2 of 0.0083. CONCLUSION: Analysis from an online database indicates that toric IOLs inserted into eyes with longer AL are more likely to rotate and to rotate more degrees from the target axis. The findings from this study are clinically relevant for surgeons implanting toric IOLs.

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Jennifer L. Patnaik, Malik Y. Kahook, John P. Berdahl, et al. Association between axial length and toric intraocular lens rotation according to an online toric back-calculator. Int J Ophthalmol, 2022,15(3):420-425

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Publication History
  • Received:May 14,2021
  • Revised:November 08,2021
  • Adopted:
  • Online: March 01,2022
  • Published: