Sensitivity and Specificity of Smartphone-Based Retinal Imaging for Diabetic Retinopathy: A Comparative Study.

Area of Science:

• Ophthalmology
• Medical Imaging
• Diabetology

Background:

• Diabetic retinopathy (DR) is a leading cause of vision loss in diabetic patients.
• Early detection and management of DR are crucial to prevent severe visual impairment.
• Smartphone-based fundus cameras offer potential for accessible DR screening.

Purpose of the Study:

• To evaluate the sensitivity and specificity of the Remidio Fundus on Phone (FOP) for detecting diabetic retinopathy (DR).
• To compare the performance of the Remidio FOP against a conventional tabletop fundus camera and clinical examination.
• To assess image quality and gradability using the Remidio FOP.

Main Methods:

• A cross-sectional instrument validation study was conducted.
• Consecutive diabetic patients with varying stages of DR and diabetic macular edema (DME) were included.
• Fundus images were captured using the Remidio FOP and a Topcon tabletop camera; images were graded by masked retina specialists.

Main Results:

• The Remidio FOP achieved high sensitivity (93.1%-94.3%) and specificity (89.1%-94.5%) for detecting any DR compared to clinical examination.
• Image quality was marginally better with the Remidio FOP, and the rate of ungradable images was low (1.7%-2.1%).
• Agreement between graders was good (κ = 0.55) for the Remidio FOP, comparable to the Topcon camera (κ = 0.68).

Conclusions:

• The Remidio FOP is a sensitive and specific tool for detecting diabetic retinopathy across all grades.
• The smartphone-based camera provides good image quality and gradability, making it a viable option for DR screening.
• The Remidio FOP facilitates accessible and effective screening for diabetic retinopathy.