April 2011
Volume 52, Issue 14
Free
ARVO Annual Meeting Abstract  |   April 2011
Influence of Contact Lens-Induced Optical Defocus on Peripheral Visual Acuity and Contrast Sensitivity
Author Affiliations & Notes
  • Percy Lazon De La Jara
    Brien Holden Vision Institute, Sydney, Australia
    School of Optometry and Vision Science, University of New South Wales, Sydney, Australia
  • Fabian Conrad
    Brien Holden Vision Institute, Sydney, Australia
  • Padmaja R. Sankaridurg
    Brien Holden Vision Institute, Sydney, Australia
    Vision CRC, Sydney, Australia
  • Darrin Falk
    Brien Holden Vision Institute, Sydney, Australia
    Vision CRC, Sydney, Australia
  • Arthur Ho
    Brien Holden Vision Institute, Sydney, Australia
    School of Optometry and Vision Science, University of New South Wales, Sydney, Australia
  • Footnotes
    Commercial Relationships  Percy Lazon De La Jara, Ciba Vision (F); Fabian Conrad, Ciba Vision (F); Padmaja R. Sankaridurg, Ciba Vision (F), US7665842 (P); Darrin Falk, Ciba Vision (F); Arthur Ho, Ciba Vision (F), US70254608 (P), US7665842 (P)
  • Footnotes
    Support  Brien Holden Vision Institute, Australian Government CRC Scheme (Vision CRC), Ciba Vision
Investigative Ophthalmology & Visual Science April 2011, Vol.52, 1901. doi:
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      Percy Lazon De La Jara, Fabian Conrad, Padmaja R. Sankaridurg, Darrin Falk, Arthur Ho; Influence of Contact Lens-Induced Optical Defocus on Peripheral Visual Acuity and Contrast Sensitivity. Invest. Ophthalmol. Vis. Sci. 2011;52(14):1901.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : To investigate the influence of defocus induced by soft contact lenses (SCL) on contrast sensitivity (PCS) and visual acuity (PVA) in the peripheral visual field.

Methods: : Two novel designs of SCL (Lotrafilcon B, CIBA Vision, USA) were tested: a higher (HD) and a lower (LD) design that introduce positive peripheral powers relative to on-axis power. Myopic participants wore the HD SCL with a relative peripheral power of +7.50D (n=14) and the LD SCL with a relative peripheral power of +4.00D (n=13). All participants wore a commercially-available single vision SCL (Lotrafilcon B, CIBA VISION, USA) as a control. Central and peripheral refraction were measured using a modified Shin-Nippon NVision K5001 autorefractor. PCS and PVA were assessed at the 30° temporal (TF) and nasal (NF) visual field using a computer-based test; sinusoidal gradation annuli of 2 cycles per degree for PCS (tandem pairs); Landolt C for PVA; both stimuli were presented tachistoscopically (200 ms) and a staircase procedure (1-up-3-down) was used to determine threshold. Paired t-tests were used to test for differences between lenses and retinal visual fields.

Results: : Both novel SCLs showed a significant increase in relative myopic defocus at the NF and TF at 30° field compared to the control (p<0.05). There was nasal-temporal asymmetry, the induced myopic defocus (M) being greater in the NF (LD -2.25±2.00D, HD -3.85±1.23D) than the TF (LD -0.45±1.01D, HD -1.13±1.18D). The nasal retina (TF) has greater PCS irrespective of which lens was worn (p<0.05), however for PVA this effect was not observed with the novel lenses. Compared to the control, the HD design decreased PCS in both peripheral locations (p<0.05) whereas PVA was not affected in NF and the LD design decreased PCS only in the nasal field, PCS in the temporal field and PVA remained unaffected (p>0.05).

Conclusions: : PCS is sensitive to peripheral defocus induced by SCL. To a lesser extent, PVA in the TF is also influenced by SCL-induced defocus. In agreement with previous findings, the nasal retina has greater PCS than the temporal retina. The refractive status at 30° field influences peripheral visual performance.

Keywords: contrast sensitivity • visual acuity • contact lens 
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