Authors:
David Melo
1
;
2
;
João Costa
2
;
Filipe Soares
2
and
Pedro Vieira
1
Affiliations:
1
Universidade Nova de Lisboa, Portugal
;
2
Fraunhofer Portugal AICOS, Portugal
Keyword(s):
Diabetic Retinopathy, Fundus Camera, Optical System Design, Mechanical Prototyping.
Abstract:
Imaging the eye retina is critical to diagnose various pathologies, particularly Diabetic Retinopathy, which is
the leading cause of avoidable blindness in the world. Accessing the retina can be achieved through ophthalmoscopes
with small field-of-view or Optical Coherence Tomography and fundus cameras, which are larger
and expensive. The image acquisition through tabletop fundus cameras is the preferred method for retinopathy
screening. However, these devices tend to be cumbersome and require expertise for operation, limiting its
broad application. In this paper, a compact optical system was designed for a handheld and smartphone-based
fundus camera prototype called EyeFundusScope, with the main goal of low-cost and high coverage screening.
The key features for the compact optical system are the mobile and non-mydriatic acquisition of fundus images
by a smartphone camera, with high field-of-view. The simplicity of the optical system was accomplished
by a three lens system s
etup, simulated using ray tracing software. The results reveal a system with only a few
aberrations in the periphery but with a good resolution at the center of 41 field-of-view. Besides the optical
system, a mechanical prototype was designed with the purpose of being 3D printed and easily portable.
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