Wide field of view handheld smart fundus camera for telemedicine applications

Palacios, Diego; Shen, Kai; Baig, Sarfaraz; Wang, James H.; Zhang, Chang; Chen, Dunhan; Wang, Michael R.

doi:10.1117/1.jmi.8.2.026001

Cited by 6 publications

(6 citation statements)

References 11 publications

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“…Single axis fundus illumination has been shown. 13 Expansion on this concept utilizes a different Volk lens and different LED source diameter size to allow for illumination of retinas with a smaller pupil opening. Figure 2 shows the configuration of the optical lens group.…”

Section: Optical Hardware Configurationmentioning

confidence: 99%

“…The right polarizer is rotated 90° from previous to remove reflections from the cornea. 13,14 At the entrance of the pupil the LED ring light has inner and outer diameters of 2 mm and 4 mm, respectively, which is formed by using 6 equally spaced surface mount LEDs for each wavelength. Only one wavelength is selected at a time.…”

Section: Optical Hardware Configurationmentioning

confidence: 99%

“…The stock lens on the camera CCD sensor has been removed to facilitate quality retinal imaging. 15,13…”

Section: Optical Hardware Configurationmentioning

confidence: 99%

“…Both irises can be properly used in combination for image brightness control with trade-off of affecting the retinal viewing area and aberration visibility. Retinal illumination control through LED current control offers the advantage of a larger retinal image FOV 13.…”

mentioning

confidence: 99%

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Wide field of view non-mydriatic biomarker detection portable fundus camera

Palacios

Zhai

Mendoza‐Santiesteban

et al. 2023

Ophthalmic Technologies XXXIII

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We report a large field of view FOV low-cost smart fundus camera with non-mydriatic and spectral band illumination features for the purpose of diagnosing central nervous system diseases such as Alzheimer’s disease. By combining a customized optical lens group, ring light emitting diode light source, Li-battery, and Raspberry Pi we can port the spectrally selected light source through a 4 mm diameter pupil. Taking advantage of the open hardware platform and Linux operating system, we integrate two narrowband filters explicitly selected based on the unique spectrums of biomarkers (580 nm and 660 nm) with a Raspberry Pi camera module to obtain high quality images for the purpose of enhancing the visibility of retinal vasculature and nerve fiber layer.

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Section: Optical Hardware Configurationmentioning

confidence: 99%

Section: Optical Hardware Configurationmentioning

confidence: 99%

“…The stock lens on the camera CCD sensor has been removed to facilitate quality retinal imaging. 15,13…”

Section: Optical Hardware Configurationmentioning

confidence: 99%

mentioning

confidence: 99%

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Wide field of view non-mydriatic biomarker detection portable fundus camera

Palacios

Zhai

Mendoza‐Santiesteban

et al. 2023

Ophthalmic Technologies XXXIII

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“…There have been active efforts to develop portable handheld 3,4 or smartphone 5–7 fundus cameras for pursuing affordable teleophthalmology. The portable imagers have been successfully demonstrated for DR screening, 5,8 optic nerve evaluation, 9,10 and retinopathy of prematurity (ROP) assessment, 11 etc.…”

Section: Introductionmentioning

confidence: 99%

Developing portable widefield fundus camera for teleophthalmology: Technical challenges and potential solutions

Yao

Son

2021

Exp Biol Med (Maywood)

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A portable, low cost, widefield fundus camera is essential for developing affordable teleophthalmology. However, conventional trans-pupillary illumination used in traditional fundus cameras limits the field of view (FOV) in a snapshot image, and frequently requires pharmacologically pupillary dilation for reliable examination of eye conditions. This minireview summarizes recent developments in alternative illumination approaches for widefield fundus photography. Miniaturized indirect illumination has been used to enable compact design for developing low cost, portable, widefield fundus camera. Contact mode trans-pars-planar illumination has been validated for ultra-widefield fundus imaging of infant eyes. Contact-free trans-pars-planar illumination has been explored for widefield imaging of adult eyes. Trans-palpebral illumination has been also demonstrated in a smartphone-based widefield fundus imager to foster affordable teleophthalmology.

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