Eyejusters Ltd, Oxford UK
Eyejusters are self-adjustable eyeglasses, designed to set the focal length of the lens based on the usage.
Eyejusters are self-adjustable eyeglasses which eliminate the need to have different pairs of glasses for different tasks or for individuals who are unable to see an optometrist have glasses fit. The design deal with presbyopia, a condition in old ages where the eyes lose the power to switch from near vision to far vision. The design allows the spectacles to move from convex to concave with the application of the fluid-filled lens.
Countries where the product has been distributed include: South Sudan, Kenya, Uganda, Morocco, Cameroon, India, US, & UK
Eyejusters Ltd design and manufacture the glasses. 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 distributors in developing countries.
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 the 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: Good health and well-being
Individuals in developing countries in need of glasses for those without access to trained optometrists.
Eyejusters Ltd designs, manufacture, and sells the glasses. Organizations can purchase distribution kits from Eyejusters Ltd and deploy the glasses in the communities they work in.
SlideLens®, the lens technology developed and used by Eyejusters is in the process of getting the patent.
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.
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 farsightedness. Each Eyejuster box includes a 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 its website for distributors. Eyejusters also offers direct technical support via phone or email.
The removable magnetic slider component used for making adjustments might need to be replaced if lost. Eyejusters supplies extra parts in their distribution kits.
- 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
No testing has been completed.
Eyejusters Ltd has developed SlideLens technology in-house, claiming to have “designed, simulated and measured the lenses with nanometer-scale precision to ensure the best quality optical experience.”
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.
Sankaridurg, P., Donovan, L., Varnas, S., Ho, A., Chen, X., Martinez, A., … & Holden, B. (2010). Spectacle lenses designed to reduce progression of myopia: 12-month results. Optometry and vision science: official publication of the American Academy of Optometry, 87(9), 631.
Douali, M. G., & Silver, J. D. (2004). Self‐optimised vision correction with adaptive spectacle lenses in developing countries. Ophthalmic and Physiological Optics, 24(3), 234-241.
Silver, J. D., Douali, M. G., Carlson, A. S., & Jenkin, L. (2010). How to use an adaptive optical approach to correct vision globally. South African Optometrist, 62(3), 126-131.
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., MacKenzie, G., Zeng, Y., Silver, J. D., & Ellwein, L. (2011). The child self-refraction study: results from urban Chinese children in Guangzhou. Ophthalmology, 118(6), 1162-1169.
Zhang, M., Zhang, R., He, M., Liang, W., Li, X., She, L., … & Moore, B. (2011). Self correction of refractive error among young people in rural China: results of cross sectional investigation. Bmj, 343, d4767.
Evaluation methods include analysis of quantitative data collected by international distributors.
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