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Related Experiment Video

Updated: Jun 11, 2026

Stereoacuity Improvement using Random-Dot Video Games
06:25

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Published on: January 14, 2020

Stereoacuity with simultaneous vision multifocal contact lenses.

Teresa Ferrer-Blasco1, David Madrid-Costa

  • 1Optometry Research Group (GIO), Optics Department, University of Valencia, Valencia, Spain. teresa.ferrer@uv.es

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|July 13, 2010
PubMed
Summary

Focus Progressives and PureVision Multifocal contact lenses both preserve stereopsis. Focus Progressives demonstrated superior near visual acuity and stereoacuity (SA) compared to PureVision Multifocal lenses.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Presbyopia affects near vision, necessitating multifocal correction.
  • Simultaneous vision contact lenses offer a solution for presbyopic individuals.
  • Evaluating visual performance with multifocal contact lenses is crucial for patient satisfaction.

Purpose of the Study:

  • To compare near stereoacuity (SA) between Focus Progressives and PureVision Multifocal simultaneous vision contact lenses.
  • To assess binocular high-contrast visual acuity at distance and near with both lens types.

Main Methods:

  • A crossover study design involved 20 presbyopic subjects.
  • Subjects were fitted with Focus Progressives or PureVision Multifocal lenses for one month each.
  • Near stereoacuity was measured using Howard-Dolman, Titmus, and Random dot stereotests under photopic conditions.

Main Results:

  • Focus Progressives showed significantly better near stereoacuity across all tested methods (Howard-Dolman, Titmus, Random dot) compared to PureVision Multifocal.
  • Near visual acuity was statistically better with Focus Progressives (+0.01 logMAR) than PureVision Multifocal (+0.06 logMAR).
  • Distance visual acuity was similar between the two lens types.

Conclusions:

  • Both Focus Progressive and PureVision Multifocal contact lenses effectively preserve stereopsis and provide good visual acuity.
  • Focus Progressives exhibited slightly better near visual acuity and superior stereoacuity compared to PureVision Multifocal.
  • The Howard-Dolman apparatus may provide more sensitive stereoacuity measurements than vectographic tests.