Dados do Trabalho

Título

When daily technology meets clinical practice: low cost 3D retina imaging prototype at the palm of your hand

Método

Build a low cost portable retina imaging device that can acquire 3D pictures
The Idea of this device started from the premise that 2 cameras on a smartphone can acquire stereopsis images. To test this effect on the retina we aligned these cameras to a 20D lens using 2 nylon molds and a mobile car phone holder. Initially we used a lathe to shape 2 cylindrical nylon molds with dimensions of 20cm high x 4cm ray and 11x5cm. After we placed a 20D lens between the 2 molds. The molds were fitted with a screw-thread device that enabled focus with a slow and firm shift of the distance between the eye and the 20D lens. Finally we connected the cell with 2 12mpx cameras through the mobile car phone holder. We made the prototype in approximately 48 hours divided in 1 week. The total expenditure was approximately 900 dollars. During the test phase we had problems with reflex on the lens. To decrease the reflex we painted the molds with matte black and changed the lens to a better quality one. We also had difficulties on acquiring a photo with 2 cameras, as it require more light and distance than usual. To fix this problem we used the app Focus. This app allows the cell to keep the flashlight on, making it easier to take 3D pictures.

Resultado

The model was tested on a normal and on a myopic patient. We were able to observe a depth difference between the 2 eyes and identify a staphyloma on the myopic eye. As a prototype this device had to be build under measure at an industrial environment, giving it difficult reproducibility. We are currently working on making it cheaper and more reproducible.

Conclusão

We built a portable device capable to differentiate normal from myopic eyes and identify staphylomas through 3D image capture. We believe this prototype may also be able to identify intraocular tumors, retinal detachment, colobomas and other pathologies, therefore being of great use in communities without access to ocular ultrasound. With future improvements on the Smartphone cameras this idea of using stereopsis at the palm of your hand may be the future of glaucoma screening devices.

Área

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