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Visual acuity in contact lens wearers.

M D Bailey1, J J Walline, G L Mitchell

  • 1The Ohio State University College of Optometry, Columbus 43210-1240, USA. mbailey@optometry.ohio-state.edu

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|November 10, 2001
PubMed
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Rigid gas permeable contact lens wearers showed worse habitual vision, but this difference disappeared with best correction. Traditional soft contact lens wearers experienced poorer low-contrast vision and a greater high-low contrast acuity difference.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • The difference between high- and low-contrast visual acuity is a key indicator of vision loss in ocular conditions.
  • The impact of refractive error correction on this visual acuity difference remains a subject of debate.

Purpose of the Study:

  • To investigate the effect of different refractive correction methods (spectacles, rigid gas permeable contact lenses, soft contact lenses) on high- and low-contrast visual acuity.
  • To determine if habitual correction differs from best correction in its effect on visual acuity measures.

Main Methods:

  • Visual acuity was measured in 116 rigid gas permeable contact lens wearers, 51 spectacle wearers, and 50 soft contact lens wearers.
  • Measurements were taken using both habitual and best refractive correction.

Related Experiment Videos

  • Soft contact lens wearers were further categorized into disposable and traditional lens users.

    • Main Results:

    • Rigid gas permeable contact lens wearers exhibited statistically worse habitual high-contrast visual acuity compared to spectacle wearers.
    • Traditional soft contact lens wearers demonstrated significantly poorer low-contrast visual acuity compared to all other groups.
    • Traditional soft contact lens wearers showed a larger difference between high- and low-contrast visual acuity with best correction than rigid gas permeable lens wearers.

    Conclusions:

    • Rigid gas permeable contact lens wearers' habitual visual acuity deficits were not present with optimal correction, suggesting suboptimal habitual correction.
    • Traditional soft contact lens wearers exhibited impaired low-contrast visual acuity and a more pronounced high-low contrast acuity difference, even with best correction.
    • These findings highlight differences in visual performance based on refractive correction type and highlight the importance of optimal correction for visual acuity.