How are Radial Refractive Gradient (RRG) glasses used for myopia control?

The glasses are worn on a daily basis instead of regular glasses.

How do RRG glasses work for myopia control?

The glasses are based on the idea that peripheral hyperopia creates nearsightedness and that the elimination of that hyperopia should slow myopic progression. You can read about the concept of peripheral focus under the Definitions menu. One report for the only lens currently on the market (Asia only) say that it reduces progression by 30%.

Are there any side effects?

As with any treatment option, the treatment may not work. The reported myopic control of 30% is similar to Progressive Addition Lenses (PALs). One study has been reported, there are the various patents that have been filed and the promotional material of the one lens currently on the market in Asia only, the Myolens by Zeiss can be found in the links below. The testimonials indicate there is a distortion that is adapted to over time. There are not indications of what the effect is for those involved in activities such as sports requiring good eye-hand coordination.

The reported rate of myopia progression reduction (30%) is about the same as reported in the COMET study for Progressive Addition Lenses for the first year. The COMET study did not show the effect lasting for more than one year. It remains to be seen how the RRG glasses will compare. In the meantime the marketing machinery is hard at work.

What are RRG glasses?

They are glasses with a lens that cosmetically looks very similar to the lenses in a regular pair of glasses. They are designed to have clear vision centrally but surrounded by a ring of decreased myopic power (additional plus power), similar to a progressive addition lens (PAL). The ring fully circles the periphery of the lens so that when vision is straight ahead, focused on a distant object, peripheral vision has a different power in all directions, not just inferiorly as in a regular PAL. This results in a more myopic focus peripherally. Although the Zeiss lens (MyoVision) is the only lens currently available in limited markets (June 2010), other companies have patents and are assumed to be working on their own designs.

The lens results for the first year were reported at the ARVO convention in 2010 and can be read about in the Research menu under Progression of Myopia With Spectacle Lenses Designed to Reduce Relative Peripheral Hyperopia: 12 Months Results.

You can learn more abut the MyoLens in this YouTube video: MyoVision (English and Chinese with subtitles)

You can read a patent for one type RRG lens here: Ophthalmic Lens Element for Myopia Correction

What are RRG glasses normally used for?

RRG glasses have no use except as an attempt to reduce myopic progression while correcting vision at the same time..