Below is a link to a website (myopiaprevention.org) that offers information on myopia. The link opens a page on the site that lists articles on peripheral defocus. Peripheral defocus in myopia is interesting, because it has been shown to impact the development and progression of myopia in some animal studies. Myopic defocus at the periphery appears to slow the progression of myopia, and single vision glasses and lenses work in the opposite way: they make the peripheral vision more hyperopic, and may therefore encourage myopia progression. This argument has been made for a long time (that minus glasses might worsen myopia) but the exact mechanism by which single vision glasses or contact lens wear might affect the development of myopia is unknown; peripheral refraction possible plays a role. Radial refractive glasses like Myovision (Zeiss) and dual focus contact lenses are designed to address this issue.
http://www.myopiaprevention.org/references_peripheral_defocus.html
