Self adjusting glasses

Two recent optometric innovations are changing the ways in which vision impaired people in the developing world may be helped 


Both are low cost (under $20 a pair), may be dispensed without aid of optometric equipment, by non professionals (non profit organization staff and volunteers), while allowing vision impaired people to literally help themselves by participating in the process of correcting their own refractive error.



Invented by Oxford University physicist Dr. Joshua Silver, ADSPECS employ a unique technology allowing wearers to change the shape of the lenses, making them thicker or thinner, thereby correcting their own refractive error when looking through them.  Lauded as one of the most important advances in aid of humanitarian causes in the last fifty years, ADSPECS were created strictly for use in the developing world.  

These glasses correct refractive error to a powerful plus or minus 6 diopters, making them 2 diopters more powerful in strength than is required by a majority of people suffering from refractive error. Rigorous testing has shown these glasses to be equivalent to conventional ground-lens glasses both in terms of durability and precision vision correction.  

Approximately 40,000 pairs of these glasses have now been distributed in the developing world, including countries in Africa, Central and South America, India, the Balkans, China and Indonesia.

Click on the logo below to see inventor Joshua Silver demonstrate the glasses during a TED talk.




A second generation model of self adjusting glasses, also called Alvarez lens glasses.  EYEJUSTERS employ a different technology from ADSPECS, where two lenses making up each eye piece are adjusted to slide across one another, left-to-right or right-to-left, their combined overlapping shapes serving as a single lens through which refractive error is corrected.

Thoroughly tested and as durable as ADSPECS, EYEJUSTERS are lighter in weight and for some, more cosmetically appealing. Not as powerful as Adspecs (Eyejusters correct refractive error to plus or minus 4 diopters, the most common range of visual impairment), their principle advantage is that they may be adjusted on a continuing basis.  This means that wearers suffering from both hyperopia and myopia (near and distance vision problems) may adjust the lenses back and forth.  For more information about EYEJUSTERS visit

See how they work at

Launch a vision correction outreach to learn about becoming involved distributing self adjusting glasses in the developing world.