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Related Experiment Videos

Task and visual performance with contact lenses and spectacles.

J E Sheedy1, M G Harris, L Poon

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

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|May 1, 1992
PubMed
Summary
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Rigid gas permeable contact lenses and spectacles show similar task and vision performance for presbyopes. Soft contact lenses resulted in minimal performance decrements compared to spectacles.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Previous research indicated performance disparities between multifocal contact lenses and spectacles for presbyopic individuals.
  • This study focuses on comparing single vision contact lenses with spectacles.

Purpose of the Study:

  • To evaluate and compare task performance and visual acuity between single vision contact lenses (soft and rigid gas permeable) and spectacles in presbyopic individuals.

Main Methods:

  • Eighteen soft contact lens (SCL) and seventeen rigid gas permeable (RGP) wearers were fitted with distance-correcting spectacles (SPEX).
  • Occupational task performance and visual acuity (high, low contrast, and low contrast with glare) were measured under both lens conditions.
  • Tasks included fine motor skills, card sorting, letter counting on a VDT screen, and a distance/near fixation task.

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Main Results:

  • Visual acuity was lower with SCL compared to SPEX.
  • Low contrast visual acuity with glare was significantly reduced with SCL versus SPEX (p < 0.05).
  • No significant differences in task completion times were found between contact lenses and spectacles, though SCLs had slightly more errors.

Conclusions:

  • Rigid gas permeable contact lenses and spectacles demonstrate nearly equivalent task and visual performance in presbyopic wearers.
  • Soft contact lenses showed minimal performance decrements compared to spectacles, with slightly increased error rates in occupational tasks.