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Related Experiment Video

Updated: Apr 17, 2026

Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity
05:46

Author Spotlight: Advancements in Refractive Surgical Correction for Presbyopia and Exploring Postoperative Visual Acuity

Published on: September 20, 2024

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Digital pupillometry and centroid shift changes after cataract surgery.

Anastasios John Kanellopoulos1, George Asimellis1, Stella Georgiadou1

  • 1From Laservision.gr Clinical and Research Eye Institute (Kanellopoulos, Asimellis, Georgiadou), Athens, Greece, and New York University School of Medicine (Kanellopoulos), New York, New York, USA.

Journal of Cataract and Refractive Surgery
|February 10, 2015
PubMed
Summary

Cataract surgery reduces pupil size and temporal shift, impacting pupil centration. These findings are crucial for precise intraocular lens placement during surgery.

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Area of Science:

  • Ophthalmology
  • Surgical Outcomes
  • Corneal Biomechanics

Background:

  • Cataract surgery's impact on pupil dynamics is not fully understood.
  • Accurate intraocular lens (IOL) centration is vital for optimal visual outcomes.
  • Pupil size and centration can influence refractive results after cataract surgery.

Purpose of the Study:

  • To compare changes in pupil size and centration after cataract surgery.
  • To evaluate pupil dynamics in relation to corneal landmarks.
  • To assess the clinical relevance of these changes for IOL implantation.

Main Methods:

  • Prospective study of 40 eyes undergoing cataract surgery.
  • Pupil size and centration were measured preoperatively and 1 month postoperatively.

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  • Digital pupillometry analyzed pupil size and corneal vertex-to-apex distance.

    • Main Results:

    • A statistically significant reduction in pupil size was observed under both photopic (-9.8%) and mesopic (-9.1%) conditions.
    • Postoperative pupil centration showed a reduced shift (0.05 mm) compared to preoperative measurements (0.12 mm).
    • A correlation was found between vertex-to-apex shift and pupil centroid shift.

    Conclusions:

    • Cataract extraction influences both pupil size and centration.
    • A smaller pupil size and reduced temporal shift are common postoperative findings.
    • These changes have implications for intraoperative IOL centration strategies.