Smartphone fundus photography: a narrative review

Area of Science:

• Ophthalmology
• Medical Imaging Technology

Background:

• Smartphone fundus photography emerged in 2010, experiencing significant advancements.
• This review examines the principles, techniques, challenges, and safety of smartphone-based retinal imaging.

Purpose of the Study:

• To review the principles and practical aspects of smartphone fundus photography.
• To identify challenges for beginners and available solutions.
• To assess the safety of smartphone flashlights for retinal photoreceptors.

Main Methods:

• Narrative review of smartphone fundus photography principles.
• Discussion of common beginner difficulties and assistive tools.
• Analysis of safety data regarding smartphone flashlight irradiance.

Main Results:

• Smartphone fundus photography utilizes indirect ophthalmoscopy principles with smartphone cameras and flashlights.
• Beginner challenges include distance adjustment, glare, and reflections, often mitigated by apps and devices.
• Current smartphone flashlight irradiance is within safety limits (ISO 15004-2.2), but newer, higher-power models require further safety assessment.

Conclusions:

• Smartphone fundus photography is an accessible, portable, and economical retinal imaging solution.
• Mastery is achievable with practice and dedicated mobile applications.
• This technique holds potential for artificial intelligence, diagnostics, and education when integrated into ophthalmology training.