Peripheral myopization and visual performance with experimental rigid gas permeable and soft contact lens design

Abstract

RGP lens design seems to be more effective to induce a significant myopic change in the relative peripheral refractive error. Both lenses preserve a good visual performance. The worsened optical quality observed in ExpRGP was due to an increased coma-like and spherical-like HOA. However, no impact on the visual quality as measured by CSF was observed.

Efficacy of a Gas Permeable Contact Lens to Induce Peripheral Myopic Defocus

“…This has been confirmed recently in a pilot study that compared the peripheral refraction between the current ExpRGP design and the same design manufactured in a hydrogel material. 5 In contrast, it appears that the effect of the RGP lens might be stronger (average change in RPRE, j2.00 D) than the one intended to be reproduced (j1.50 D as expected from the lens design at 30 degrees). In the present work, it has been found that the change induced in the RPRE can be greater than 2.00 or even 3.00 D in a significant proportion of eyes with the ExpRGP lens.…”

“…In that study, the rigid gas permeable (RGP) lens was more effective than the soft lens for creating the peripheral myopic defocus. 5 The better on-eye stability of the RGP material compared with the soft contact lens materials might explain this outcome. Furthermore, that study showed that a standard aspheric RGP lens might also provide some peripheral myopic defocus.…”

Optical and pharmacological strategies of myopia control

“…The visual experience in the peripheral visual field plays a critical role in the regulation of ocular growth or refractive error development and peripheral myopic defocus has been proposed to counteract the stimulus for axial elongation . Consequently, this has sparked the interest of researchers and industry, resulting in the development of various novel multifocal spectacles and contact lenses with the aim of manipulating the retinal defocus experience for myopia control …”

Strategies to Regulate Myopia Progression With Contact Lenses

“…81 A special soft CL with these features was used in a clinical trial to assess its effectiveness in myopia regulation. 61 The treatment CLs made of a silicone hydrogel lens material (8.6-mm base curve, 14.2-mm diameter, lotrafilcon B; CIBA Vision, Duluth, GA) had a clear central zone that corrected for the eye's central refractive error (1.5-mm semichord and 1.5 mm within a relative plus of +0.25 D).…”