A Novel, Smartphone-Based, Teleophthalmology-Enabled, Widefield Fundus Imaging Device With an Autocapture Algorithm

Area of Science:

• Ophthalmology
• Medical Imaging
• Telemedicine

Background:

• Widefield imaging is crucial for detecting retinal pathologies beyond the posterior pole.
• Advancements in posterior segment imaging are enhancing diagnostic capabilities.
• There is a growing need for accessible and portable retinal imaging solutions.

Purpose of the Study:

• To report a novel smartphone-based, telemedicine-enabled, widefield retinal imaging device.
• To evaluate its autofocus, autocapture, and usability by non-specialist operators.
• To assess its potential for detecting retinal pathology.

Main Methods:

• The Remidio Vistaro device utilizes annular illumination and lacks cross-polarizers to prevent Purkinje reflexes.
• Resolution was measured at 64 lp/mm (center), 57 lp/mm (middle), and 45 lp/mm (periphery).
• An autocapture algorithm and field of view (FOV) validation were performed, followed by a pilot study for image quality assessment.

Main Results:

• The device achieved an approximate 65° FOV in a single shot.
• Automatic image capture was successful in 80% of examinations within 10-15 seconds.
• 91.6% of images were deemed clinically useful, with montages exceeding standard methods.

Conclusions:

• A novel, portable, smartphone-based widefield imaging device provides a 65° FOV for retinal imaging.
• This technology can effectively image the retina beyond the posterior pole.
• Smartphone-based widefield imaging is suitable for widespread screening of retinal pathologies.