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Related Experiment Videos

Task and visual performance with concentric bifocal contact lenses.

J E Sheedy1, M G Harris, M R Bronge

  • 1Morton D. Sarver Laboratory for Contact Lens and Corneal Research, University of California, Berkeley.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|July 1, 1991
PubMed
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Bifocal contact lenses (BCL) reduced near task performance, visual acuity, and stereopsis in presbyopes. Despite these deficits, many patients still preferred wearing BCL, indicating potential satisfaction with bifocal contact lenses.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Presbyopia, the age-related loss of accommodation, affects near vision.
  • Bifocal contact lenses (BCL) offer a potential solution for presbyopic individuals needing correction for both distance and near vision.

Purpose of the Study:

  • To evaluate the impact of concentric simultaneous vision bifocal contact lenses (BCL) on task performance, visual acuity, and stereopsis in presbyopic individuals.
  • To compare the performance of BCL with a control condition (distance contact lenses plus reading spectacles).

Main Methods:

  • Forty presbyopic participants were fitted with either BCL or the control (distance contact lenses with reading spectacles).
  • Task performance, visual acuity, and stereopsis were measured at baseline and after 8 weeks of lens wear.

Related Experiment Videos

  • Thirty-two participants completed the 8-week study.

    • Main Results:

    • BCL wear resulted in significantly longer task completion times and more errors for near tasks compared to the control.
    • Visual acuity was significantly reduced with BCL (0.8 to 1.4 acuity lines) compared to the control.
    • Stereopsis was significantly reduced with BCL (32 to 36 sec arc) compared to the control.

    Conclusions:

    • Simultaneous vision BCL can decrease task performance and visual acuity, likely due to reduced visual clarity.
    • Despite performance reductions, a majority of screened and fitted presbyopic patients chose to continue wearing BCL regularly.
    • Patient satisfaction with BCL is possible, but the impact on visual performance should be considered during candidate evaluation.