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Digital Image Sensor Integration in the Scope of EyeFundusScope: a Retinal Imaging System for Mobile Diabetic Retinopathy Assessment
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Diabetic Retinopathy is a pathology, asymptomatic in early stages, that is a consequence
of diabetes mellitus, a disease that affects millions of people worldwide. Specifically
on people with Diabetic Retinopathy, long periods of hyperglycemia lead to the
creation of very fragile blood vessels in the retina, or to the suppression of old ones,
leading to problems like hemorrhages or exudates, that may cause blindness.
Diabetic Retinopathy can be diagnosed with several devices, but these are mainly too
expensive and non-portable, not allowing the screening of a great part of the population.
This way, EyeFundusScope was created, being a smartphone based, non-mydriatic,
handheld and low-cost Embedded Retinal Imaging System. Image quality depends on the
system’s optical alignment and it should provide fundus images with a wide field-of-view.
A communication protocol for streaming video and capturing still fundus images,
from an UVC-Compliant Camera was developed, after a careful examination of the types
of cameras that could be integrated in the system. Such cameras can be placed meticulously
in the compact optical system, and suppress issues related to the different specifications
of smartphone cameras, that often vary according to the manufacturers. An
approach for low level control of high resolution and low cost camera modules was also
evaluated.
With the system developed, the user can select Internal Fixation Point Actuators, that
are extremely important for this diagnosis, since they allow a fixed target for the patient
to fixate on, reducing image aberrations due to its eye movement and providing wider
field-of-view images.
In the future, the UVC-Compliant Camera and Internal Fixation Points Actuators
should be integrated on the current prototype, providing an accurate Diabetic Retinopathy
screening tool which can enhance the early treatment of the pathology to a greater
percentage of the population.
Descrição
Palavras-chave
Diabetic Retinopathy Fundus Camera UVC Compliant Cameras Fixation Targets Mechanical Prototyping