Yang Cui1
Waseda University1
Ophthalmic fundus imaging has become an important technique for the diagnosis and treatment of eye diseases<sup>[1]</sup>. A2n ideal imaging system should have portability, low cost, and high resolution for the remote monitoring of eye health at home; however, the conventional imaging systems are large and heavy and can only be used in hospitals.<br/>To solve this problem, we demonstrate a non-mydriatic near-infrared (NIR) fundus imaging system with light illumination from an electric contact lens (E-lens)<sup>[2]</sup>. We designed a wireless power transfer system that can be bound to the contact lens and don’t block the eye view<sup>[3]</sup>. and a near-infrared LED is embedded on the contact lens and can be powered wirelessly to light up. The E-lens can illuminate the retinal and choroidal structures in the eyes. The irradiated light is reflected at the layered structures of the fundus, and subsequently, the reflected light passes through the pupil of the eye lens to capture the images with a portable NIR camera.<br/>Because of the strong light scattering effects in the fundus tissue, the captured images are blurred. Therefore, we reconstruct the images with a depth-dependent point-spread function to suppress the scattering effect that eventually visualizes the clear fundus images of the retinal and choroidal vasculature<sup>[4]</sup>. This method showed superior image reconstruction results compared to other common methods such as high-pass filtering. The proposed imaging system provides a new method for remote monitoring with increased functionality, it makes the portable eye health care possible.<br/><br/><br/>Reference:<br/>[1] R. Bernardes, P. Serranho, and C. Lobo, Ophthalmologica <b>226</b>/4, 161–181 (2011) [DOI: 10.1159/000329597].<br/>[2] Y. Cui, T. Takamatsu, K. Shimizu and T. Miyake: Applied Physics Express. <b>15</b> [2], (2022). [DOI: 10.35848/1882-0786/ac4675].<br/>[3] T. Takamatsu, Y. Chen, T. Yoshimasu, M. Nishizawa and T. Miyake: Advanced Materials Technologies. <b>4</b>/5, (2019). [DOI: 10.1002/admt.201800671].<br/>[4] K. Shimizu, K. Tochio, and Y. Kato, Appl. Opt. <b>44</b>/11, 2154–2161 (2005) [DOI: 10.1364/ao.44.002154].