Wednesday, August 14, 2013

Myopia control in children and spectacle lens design - how the right lenses can keep your eyes from getting worse

We have written extensively on the very big problem of mypoia and myopia progression.  Not only is it problematic that a child's vision gets more and more blurry as myopia progresses, it also puts the child at higher risk of developing glaucoma and retinal detachments, both of which can cause permanent vision loss.

So far, the best treatment for slowing and even stopping myopia progression is orthokeratology.  A number of studies have shown that orthokertology is effective:


Orthokeratology slows or stops the progression of myopia in children July 6, 2013

Study suggests that young children may benefit from orthokeratology February 14, 2013

New study confirms orthokeratology for slowing myopia progression January 30, 2013

Orthokeratology is shown to be safe for correcting myopia in chidlren Aug 11, 2012

Orthokeratology is shown to be effective in correcting astigmatism and myopia Jun 18, 2012
New study supports orthokeratology for myopia control and for astigmatism correction Jan 10, 2012 

As children's eye doctors we are very interested in treatments that can slow or stop the progression of myopia.

A new study published in July 2013 in the journal Investigative Ophthalmology & Visual Science suggests that the right spectacle lens design can slow the progression of myopia.   The study was titled "Peripheral Defocus and Myopia Progression in Myopic Children Randomly Assigned to Wear Single Vision and Progressive Addition Lenses".

The researchers looked at eighty-four myopic children between the age of 6 and 11 years with myopia that was measured between -0.75 and -4.50 diopters.  They were randomly assigned to wear single vision lenses or progressive addition lenses (often called "progressives" or "no-line bifocals").  The researchers then took measurements to investigate the association between peripheral defocus and the one-year change in central myopia.

The study concluded that the progressive lenses caused a myopic shift in peripheral defocus. Superior myopic defocus was associated with less central myopia progression. This suggests that lens designs like progressives that result in peripheral myopic defocus can potentially be used to slow myopia progression. 

However, orthokeratology is still the most effective way to slow myopia progression and is the only treatment that has been shown to stop myopia progression.

Citation:

Invest. Ophthalmol. Vis. Sci. 2013 Jul 09;[EPub Ahead of Print], DA Berntsen, CD Barr, DO Mutti, K Zadni

Source:
Investigative Ophthalmology & Visual Science
Peripheral Defocus and Myopia Progression in Myopic Children Randomly Assigned to Wear Single Vision and Progressive Addition LensesInvest. Ophthalmol. Vis. Sci. 2013 Jul 09;[EPub Ahead of Print], DA Berntsen, CD Barr, DO Mutti, K Zadnik