[Static vessel analysis in nonmydriatic and mydriatic images]

Area of Science:

• Ophthalmology
• Medical Imaging
• Retinal Vascular Analysis

Context:

• Static vessel analysis is crucial for assessing retinal health.
• Image quality significantly impacts the accuracy of retinal vessel diameter measurements.
• Mydriasis, or pupil dilation, is often used to improve fundus image quality.

Purpose:

• To evaluate the suitability of non-mydriatic versus mydriatic retinal images for static vessel analysis.
• To determine the influence of mydriasis induced by tropicamide on retinal vessel diameter measurements.

Summary:

• Non-mydriatic images exhibited lower quality, insufficient illumination, and poor contrast, leading to fewer detectable vessels and higher measurement variability (CRAE, AVR) compared to mydriatic images.
• Despite quality differences, no significant variations were found in the coefficient of variation for CRVE or the average values of CRAE, CRVE, and AVR across different imaging methods.
• Retinal arteries and veins larger than 60 micrometers were adequately depicted in all image types, with no significant diameter differences observed due to mydriasis.

Impact:

• The findings highlight the importance of image quality for accurate static vessel analysis, suggesting mydriatic images are preferable for consistent results.
• This study provides evidence that mydriasis does not significantly alter the diameter of larger retinal vessels (>60 micrometers), validating its use for improved imaging.
• Improved understanding of imaging parameters can lead to more reliable diagnostic tools for detecting and monitoring retinal vascular diseases.