Soft Toric Lenses

Remba, Melvin J.

doi:10.1097/00004397-198102120-00012

International Ophthalmology Clinics

1981

DOI: 10.1097/00004397-198102120-00012

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Soft Toric Lenses

Melvin J. Remba¹

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2007

2009

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Cited by 2 publications

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“…When toric contact lenses were first introduced in the 1970s, they experienced issues involving variable lens quality and stability;1-3 however, improved lens designs and the availability of disposable toric contact lenses have resulted in improved health benefits and visual acuity 4. Based on 2006 United States contact lens fitting data, there is only a 10% difference in the proportion of soft toric contact lens fits compared to soft spherical contact lens fits 5.…”

mentioning

confidence: 99%

Higher-Order Aberrations When Wearing Sphere and Toric Soft Contact Lenses

Berntsen¹,

Merchea

Richdale³

et al. 2009

Optometry and Vision Science

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Purpose To determine the on-eye effect of spherical and toric contact lens design on higher-order aberrations (HOA). Methods Thirty eyes (15 subjects) entered a masked, randomized, cross-over study. Each eye was fitted with the spherical and toric lens of the following brands in random order: Acuvue Advance, Biomedics 55, Frequency 55, and SofLens 66. HOAs were measured using the Zywave II Aberrometer over a 6-mm aperture up to fifth order. A linear model accounting for the fixed effect of lens type and random effects of subject and eye was created. Paired t-tests were completed between lens brands within the spherical and toric lenses and between the spherical and toric lens within each brand. Best-corrected visual acuity (VA) was measured and compared. Results No clinically meaningful differences in total HOAs were found between brands or between the spherical and toric lens within a brand. Positive spherical aberration (SA) was reduced by all spherical and toric lenses compared to wearing no lens by 0.07 to 0.23 μm (p<0.0001). Frequency toric induced the greatest change in SA. The thin-zone design lens (Acuvue Advance for Astigmatism) had a statistically different amount of vertical coma (−0.04 μm) than the three prism-balast toric lenses (0.11 to 0.23 μm; p<0.0001). SofLens toric had the greatest amount of vertical coma, but better VA than Acuvue Advance for Astigmatism and Frequency toric. With the exception of Acuvue Advance for Astigmatism, toric lenses had greater absolute magnitude of vertical coma than their sphere counterparts (all p<0.002). No other significant HOA differences were observed. Conclusions Toric contact lenses with prism-ballast designs demonstrated more vertical coma, but better VA. Positive SA was reduced by spherical and toric contact lenses. The visual quality effect of lens design and material on induced HOAs warrants further investigation.

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mentioning

confidence: 99%

Higher-Order Aberrations When Wearing Sphere and Toric Soft Contact Lenses

Berntsen¹,

Merchea

Richdale³

et al. 2009

Optometry and Vision Science

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show abstract

Visual Acuity with Spherical and Toric Soft Contact Lenses in Low- to Moderate-Astigmatic Eyes

Richdale

Berntsen

Mack

et al. 2007

Optometry and Vision Science

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Soft Toric Lenses

Cited by 2 publications

References 0 publications

Higher-Order Aberrations When Wearing Sphere and Toric Soft Contact Lenses

Higher-Order Aberrations When Wearing Sphere and Toric Soft Contact Lenses

Visual Acuity with Spherical and Toric Soft Contact Lenses in Low- to Moderate-Astigmatic Eyes

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