Eyejusters Ltd, Oxford UK
Self-adjustable eye glasses
Developing world countries where Eyejusters have been distributed include:
South Sudan, Kenya, Uganda, Morocco, Cameroon, India
Eyejusters Ltd designs, manufactures and sells the glasses. Organizations can purchase distribution kits from Eyejusters Ltd and deploy the glasses in the communities they work in. Eyejusters Ltd also sells glasses to distributors in developed countries and a portion of these sales covers donations of glasses that will be sent to distrutors in developing countries. Organizations that have done distributions include Peace Corps, Developing World Connections, Vision Action, Eyes for the World, and Mobile Health International.
Retail price of glasses available for purchase on eyejusters.com range from $40-59 USD. Glasses paid for through the buy-one-give-one program are donated at no cost to organizations distributing Eyejusters in developing countries. In certain circumstances, distributing organisations have small charges for end users to cover some of the costs of their development projects in local communities. Eyejusters can be puchased in bulk and at reduced cost by organizations wishing to distribute them in developing countries. The price is then ~$15 USD.
Focusspec (Focus On Vision, The Netherlands), Adlens (Adlens Ltd, United Kingdom), Adspecs ( Center for Vision in the Developing World), ChildViSion glasses (Dow Corp and Center for Vision in the Developing World)
Vision Spring is another organization involved in distribution of glasses in developing countries, although not adjustable glasses. They have trained “vision entrepreneurs” who conduct vision screenings and dispense ready made glasses to bottom of the pyramid customers.
Goal 3: to improve and promote good health.
Individuals in developing countries in need of glasses, but without access to trained optometrists. (Eyejusters is also targeted at customers in developed countries who wear multiple glasses, each with a different purpose.)
SlideLens®, the lens technology developed and used by Eyejusters is patent-pending.
Online orders are available for shipment to the US, Canada, UK, and Europe . Individuals in developing countries can get Eyejusters through organizations in their communities working as local distributors (methods of identifying beneficiaries and distribution differs from organization to organization). some donation some partially subsidized.
513,806 limbs have been distributed as of March 2016.
Eyejusters are metal frame glasses with SlideLens™ technology. Each SlideLens is a pair of lenses with a special shape. When these lenses are slid across each other (left-to-right), their combined shapes act as if they were one lens with a changing spherical surface. The SlideLens technology allows Eyejusters users to self-adjust their glasses to their own vision needs. The glasses are adjusted with a removable dial on the side of the frame.
The adjustable eyewear comes in two types: negative power to correct poor distance vision and positive power to correct near and far-sightedness.
Each Eyejuster box includes: Pair of Eyejusters; Re-attachable adjuster dials; Hard plastic case; Cleaning cloth; Instructions and close vision chart.
Eyejusters has comprehensive technical and support documents available on their website for distributors.
Eyejusters also offers direct technical support via phone or email.
Support in the field for benificiaries is provided by the organization overseeing local distributions.
* Lens technology: SlideLens™
* Near vision Eyejusters power range: +4.5 → 0 D
* Distance vision Eyejusters power range: 0 → -5.0 D
* Glasses weight: 35g
* UV protection (all UVB and most UVA rays are blocked)
* Frame features to adjust to any face: Sprung Hinges, Nose Pads
* Metal frame, multilayer, stainless, steel, or acetate frames
Eyejusters is a relatively new product (launched in 2011) and no information about vetted performance is available yet. However, a number of peer-reviewed studies have validated the efficacy of self-refraction, the principle Eyejusters is based on1,2,3. These studies have found self-refraction to be as accurate as other ﬁeld refraction methods, such as auto-refraction. Self-refraction has also been found to approach the quality of a ﬁeld refractionist performing subjective refraction, the gold standard of refractive eyecare. Eyejusters credits the vetted performance of these other self-adjustable glasses in the developing world as the foundation for Eyejusters.
Eyejusters Ltd has developed SlideLens technology in-house, claiming to have “designed, simulated and measured the lenses with nanometre-scale precision to ensure the best quality optical experience.”
Eyejusters is still in its early stages of growth and is currently establishing a data collection system with international distributors. Collected data will allow for statistical analysis of Eyejuster’s performance and impact around the world.
As a class 1 medical device (deemed to be low risk) Eyejusters pose little to no risk to their user.
Eyejusters Ltd does state that their product is intended for users age 14+ to ensure proper fit.
Eyejusters have not been the direct subject of any published academic research. However, there are several published academic papers on self-adjustable glasses, and the process of self-adjustment (called ‘self-refraction’). There have also been related field studies in Ghana, Nepal, Malawi, Nicaragua, China and South Africa. All of these related studies were foundational to Eyejusters’ development and are referred to by Eyejusters Ltd as validation for their product. These studies include:
Smith, et al “Spectacle lenses designed to reduce progression of myopia: 12-month results.” Optom. Vis. Sci. 87 (2010)
Douali, M. G. and Silver, J. D. “Self-optimised Vision Correction with Adaptive Spectacle Lenses in Developing Countries.” Ophthalmic and Physiological Optics, 24 (2004)
Silver et al, “How to Use an Adaptive Optical Approach to Correct Vision Globally” S. Afr. Optom. 62 (2003)
Additionally the articles listed below are the result of a World Bank funded clinical study, which found self-adjustable glasses to be reliable and effective; validating their use for children aged 12 and over.
He, M., Congdon, N., et al “The Child Self-Refraction Study: Results from Urban Chinese Children in Guangzhou.” Ophthalmology, 118.6 (2011)
Zhang, M., R. Zhang, M. He, et al, “Self Correction of Refractive Error among Young People in Rural China: Results of Cross Sectional Investigation.” BMJ, 343.7820 (2011)
International Organization for Standardization (ISO) offers relevant standards in ISO 21987:2009, Ophthalmic optics — Mounted spectacle lenses. Eyejusters is not ISO certified.
Evaluation methods include analysis of quantitative data collected by international distributors.
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