AVPN Global Conference 2023 | 20 - 22 June 2023


Overflow Biz: Enabling learning and livelihoods for the Visually Impaired

Overflow Biz is improving the learning environment of the visually impaired in Cambodia by developing and distributing a paperless, portable, and erasable braille slate, alongside other innovations.


Overflow Biz, Inc

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Social causes


SDGs covered

Endorsed by

MYSC (Merry Year Social Company)

MYSC is a leading social innovation consultancy & impact investor working mainly in Korea through impact network and partnership.

Market of Implementation

  • Cambodia


There are hundreds of thousands of visually impaired individuals in Cambodia, of which 40 thousand are completely blind and 600 thousand hold low vision, as of 2016.

Despite this high number, the support from the Cambodian government to the disabled sector remains to be low. Assistive technology devices for the visually impaired are expensive, and the market demand for high-tech assistive devices is extremely low in Cambodia.

On the other hand, low-tech assistive technology in the global market is not diverse enough to fulfill the varying needs of everyday life of visually impaired persons. At the moment, there are no suitable technologies available for visually impaired persons to write memos or perform calculations casually at low cost. This not only affects the quality of life of visually impaired persons, but also their access to quality of education without proper assistance.

At Overflow Biz, we are working to change that.


From the 7th of June, 2019, our team at Overflow Biz have conducted a project providing a paperless and erasable braille slate, known as the Versa Slate, for the blind students in Cambodia, funded by Korea International Cooperation Agency. During the 15 months of the project's duration, we designed and developed the item with external user evaluations, and produced the final product in May 2020. Our Versa Slate has passed tests and evaluations by prestigious braille experts in Korea.

Subsequently, we provided Versa Slates to the Krousar Thmey school for the blind and conducted product training, field testing, and interviews with 100 students and attained following results. We are proud to report that:

  • Versa Slate reduces 15% of time solving math problems of the middle school students.
  • Versa Slate attained 82.5% of satisfaction in average.
  • Versa Slate reduces 195 pieces of braille papers per one blind student in a semester.

With these results, we were selected as the most innovative partners by KOICA and received many proposals from global NGOs and organization all around the world.

For more information on our work, do refer to our Slide Deck.

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