by Iswarya on  May 4, 2020 at 11:23 AM Clinical Trials News
AI-supported Test Could Detect Early Signs of Glaucoma Progression
New artificial intelligence-based tests can help detect glaucoma progression 18 months earlier than the current gold standard method, according to a clinical trial. The findings of the study are published in the journal Expert Review of Molecular Diagnostics.

The technology could help accelerate clinical trials, and eventually may be used in detection and diagnostics.

Lead researcher Professor Francesca Cordeiro (UCL Institute of Ophthalmology, Imperial College London, and Western Eye Hospital Imperial College Healthcare NHS Trust) said: "We have developed a quick, automated and highly sensitive way to identify which people with glaucoma are at risk of rapid progression to blindness."


Loss of sight in glaucoma is caused by the death of cells in the retina, at the back of the eye.

The test, called DARC (Detection of Apoptosing Retinal Cells), involves injecting into the bloodstream (via the arm) a fluorescent dye that attaches to retinal cells and illuminates those that are in the process of apoptosis, a form of programmed cell death. The damaged cells appear bright white when viewed in eye examinations - the more damaged cells detected, the higher the DARC count.

One challenge with evaluating eye diseases is that specialists often disagree when viewing the same scans, so the researchers have incorporated an AI algorithm into their method.

In Phase II clinical trial of DARC, the AI was used to assess 60 of the study participants (20 with glaucoma and 40 healthy control subjects). The AI was initially trained by analyzing the retinal scans (after injection of the dye) of the healthy control subjects. The AI was then tested on the glaucoma patients.

Those taking part in the AI study were followed up 18 months after the main trial period to see whether their eye health had deteriorated.

The researchers were able to accurately predict progressive glaucomatous damage 18 months before that seen with the current gold standard OCT retinal imaging technology, as every patient with a DARC count over a certain threshold was found to have progressive glaucoma at follow-up.

"These results are very promising as they show DARC could be used as a biomarker when combined with the AI-aided algorithm," said Professor Cordeiro, adding that biomarkers - measurable biological indicators of disease state or severity - are urgently needed for glaucoma, to speed up clinical trials as the disease progresses slowly so it can take years for symptoms to change.

"What is really exciting, and actually unusual when looking at biological markers, is that there was a clear DARC count threshold above which all glaucoma eyes went on to progress," she added.

First author Dr. Eduardo Normando (Imperial College London and Western Eye Hospital Imperial College Healthcare NHS Trust) said: "Being able to diagnose glaucoma at an earlier stage and predict its course of progression, could help people to maintain their sight, as treatment is most successful if provided at an early stage of the disease. After further research in longitudinal studies, we hope that our test could have widespread clinical applications for glaucoma and other conditions."

The team is also applying the test to rapidly detect cell damage caused by numerous conditions other than glaucoma, such as other neurodegenerative conditions that involve the loss of nerve cells, including age-related macular degeneration, multiple sclerosis, and dementia.

The AI-supported technology has recently been approved by both the UK's Medicines and Healthcare products Regulatory Agency and the USA's Food and Drug Administration as an exploratory endpoint for testing a new glaucoma drug in a clinical trial.

The researchers are also assessing the DARC test in people with lung disease, and hope that by the end of this year, the test may help to assess people with breathing difficulties from Covid-19.

DARC is being commercialized by Novai, a newly formed company of which Professor Cordeiro is Chief Scientific Officer.

Source: Eurekalert

Most Popular on Medindia