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Research Review:
Pupil Size and Multifocal Lens Performance

Even among individuals performing the same visual task, such as using a computer or reading a book, there is considerable variation in pupil size.

By: Alex Hui, OD, PhD, FAAO
Contact Lens Spectrum September 1, 2026 Vol 41, Issue September-October 2026 Page(s): 7
5 Key Takeaways

  • 1

    Pupil size varies significantly among individuals performing the same visual tasks, impacting multifocal contact lens performance.

  • 2

    Multifocal contact lenses show similar or insignificantly worse high-contrast distance visual acuity compared to single vision lenses across varying pupil sizes.

  • 3

    A 2-line difference in visual acuity was observed between 3-mm and 6-mm pupils when using low-contrast charts with multifocal contact lenses.

  • 4

    Visual satisfaction with multifocal contact lenses is linked to pupillary dynamics, indicating that adaptability in pupil size may enhance lens performance.

  • 5

    Tinted lenses can enlarge pupils, potentially improving distance optics experience, but may decrease distance visual acuity if light transmission is too low.