High- and low-contrast visual acuity measurements in spherical and aspheric soft contact lens wearers

Vaz, Tara; Gundel, Ralph E.

doi:10.1016/s1367-0484(03)00025-0

Cited by 20 publications

(10 citation statements)

References 15 publications

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“…, 1992; de Brabander et al. , 1998; Vaz and Gundel, 2003; Dietze and Cox, 2004), have been investigated in small groups with variable results. Our results are in accord with a recent study by Efron et al.…”

Section: Discussionmentioning

confidence: 99%

“…The effects on vision of spherical aberration of contact lenses (Hong et al, 2001;Fan et al, 2003;Roberts et al, 2006), and the effect of deliberately altering spherical aberration with contact lenses (Cox and Holden, 1990;Collins et al, 1992;de Brabander et al, 1998;Vaz and Gundel, 2003;Dietze and Cox, 2004), have been investigated in small groups with variable results. Our results are in accord with a recent study by Efron et al (2008) who examined visual acuity in spherical contact lenses and aspheric lenses which were designed to counteract the mean level of positive spherical aberration in the population.…”

Section: Discussionmentioning

confidence: 99%

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Increasing negative spherical aberration with soft contact lenses improves high and low contrast visual acuity in young adults

Rae

Allen

Radhakrishnan

et al. 2009

Ophthalmic Physiologic Optic

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Increasing negative spherical aberration with soft contact lenses improves high and low contrast visual acuity in young adults

Rae

Allen

Radhakrishnan

et al. 2009

Ophthalmic Physiologic Optic

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show abstract

“…However, little is known about the mechanism of reducing contrast sensitivity following the wearing of tinted contact lenses. In clear (nontinted design) soft contact lenses, the impact on higher-order wavefront aberrations [6][7][8][9] and the relationship between higher-order aberrations and visual performance [10][11][12][13] have been extensively investigated. Changes in higherorder aberrations after wearing tinted contact lenses, however, have never been studied.…”

Section: Introductionmentioning

confidence: 99%

Influence of cosmetically tinted soft contact lenses on higher-order wavefront aberrations and visual performance

Hiraoka

Ishii

Okamoto

et al. 2008

Graefes Arch Clin Exp Ophthalmol

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Cosmetically tinted contact lenses increase ocular higher-order aberrations and worsen contrast sensitivity under both photopic and mesopic conditions. Increases in higher-order aberrations are responsible for decreased contrast sensitivity under the photopic condition. Tinted contact lens wearers should be sufficiently informed about the possible reduction in optical quality of the eye and quality of vision.

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“…The level of spherical aberration of a soft contact lens on the eye has been reported to have the same optical effect as when the contact lens is off the eye,11 suggesting it may be possible to correct ocular spherical aberration with soft contact lenses. However, clinical studies have reported that non-toric aspheric soft contact lenses did not improve visual acuity significantly when compared to spherical lenses on low astigmats 12, 13. One reason why these non-toric lenses do not improve visual acuity is that aspheric soft contact lenses do not correct astigmatism.…”

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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High- and low-contrast visual acuity measurements in spherical and aspheric soft contact lens wearers

Cited by 20 publications

References 15 publications

Increasing negative spherical aberration with soft contact lenses improves high and low contrast visual acuity in young adults

Increasing negative spherical aberration with soft contact lenses improves high and low contrast visual acuity in young adults

Influence of cosmetically tinted soft contact lenses on higher-order wavefront aberrations and visual performance

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

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