Evaluating the peripheral optical effect of multifocal contact lenses
Article first published online: 17 SEP 2012
Ophthalmic & Physiological Optics © 2012 The College of Optometrists
Ophthalmic and Physiological Optics
Volume 32, Issue 6, pages 527–534, November 2012
How to Cite
Citation information: Evaluating the peripheral optical effect of multifocal contact lenses. Ophthalmic Physiol Opt 2012. doi: 10.1111/j.1475-1313.2012.00937.x, , , , & .
- Issue published online: 11 OCT 2012
- Article first published online: 17 SEP 2012
- Manuscript Accepted: 2 AUG 2012
- Manuscript Received: 20 MAR 2012
- Swedish Agency for Innovation Systems. Grant Number: VINNMER 2008-00992
- Ministerio de Educación y Ciencia. Grant Numbers: FIS2007-64765, CONSOLIDER-INGENIO 2010, CSD2007-00033 SAUUL
- Fundación Séneca. Grant Number: 4524/GERM/06
- Marie Curie Research Training Network. Grant Number: MRTN-CT-2006-034021
- depth of field;
- multifocal/bifocal/dual-focus contact lenses;
- peripheral wavefront aberrations
Multifocal soft contact lenses have been used to decrease the progression of myopia, presumably by inducing relative peripheral myopia at the same time as the central image is focused on the fovea. The aim of this study was to investigate how the peripheral optical effect of commercially available multifocal soft contact lenses can be evaluated from objective wavefront measurements.
Two multifocal lenses with high and low add and one monofocal design were measured over the ±40° horizontal field, using a scanning Hartmann–Shack wavefront sensor on four subjects. The effect on the refractive shift, the peripheral image quality, and the depth of field of the lenses was evaluated using the area under the modulation transfer function as the image quality metric.
The multifocal lenses with a centre distance design and 2 dioptres of add induced about 0.50 dioptre of relative peripheral myopia at 30° in the nasal visual field. For larger off-axis angles the border of the optical zone of the lenses severely degraded image quality. Moreover, these multifocal lenses also significantly reduced the image quality and increased the depth of field for angles as small as 10°–15°.
The proposed methodology showed that the tested multifocal soft contact lenses gave a very small peripheral myopic shift in these four subjects and that they would need a larger optical zone and a more controlled depth of field to explain a possible treatment effect on myopia progression.