Evaluation of a retinal oximetry image quality indicator in patients with cataract.

Purpose: To evaluate a new automated retinal oximetry image quality indicator with cataract as a clinical model.

Methods: Sixty-one eyes in 61 patients were imaged by the Oxymap T1 Retinal Oximeter at baseline and 25 eyes were also examined 3 weeks after cataract surgery. Image quality (0-10 on a continuous scale) was compared with standardized AREDS cataract grading and Pentacam lens densitometry.

Artery vein classification in fundus images using serially connected U-Nets.

Background And Objective: Retinal vessels provide valuable information when diagnosing or monitoring various diseases affecting the retina and disorders affecting the cardiovascular or central nervous systems. Automated retinal vessel segmentation can assist clinicians and researchers when interpreting retinal images. As there are differences in both the structure and function of retinal arteries and veins, separating these two vessel types is essential.

Automation improves repeatability of retinal oximetry measurements.

Purpose: Retinal oximetry is a technique based on spectrophotometry where images are analyzed with software capable of calculating vessel oxygen saturation and vessel diameter. In this study, the effect of automation of measurements of retinal vessel oxygen saturation and vessel diameter is explored.

Methods: Until now, operators have had to choose each vessel segment to be measured explicitly.

Retinal oxygen saturation changes progressively over time in diabetic retinopathy.

Purpose: According to cross-sectional studies, oxygen saturation is elevated in retinal vessels in diabetic patients. We evaluated how retinal oxygenation (metabolic marker), vessel diameters and retinopathy grade (structural markers) change over time in diabetic patients.

Design: Prospective cohort study following screening in a hospital setting.

Retinal oximetry with a prototype handheld oximeter during hyperoxia.

Purpose: Retinal oximetry measures oxygen saturation in retinal vessels. With the introduction of a mobile handheld prototype oximeter, this technique will become available for a broader patient population including bedridden patients and newborn babies. The objective is to determine the sensitivity of this handheld oximeter in room air and during isocapnic hyperoxia.