Quantitative computerized color vision testing in diabetic retinopathy: A possible screening tool?

Area of Science:

• Ophthalmology
• Medical Imaging
• Vision Science

Background:

• Diabetic macular edema (DME) is a leading cause of vision loss in diabetic patients.
• Early detection and screening are crucial for managing diabetic retinopathy (DR).
• Traditional screening methods may not always identify subtle early changes.

Purpose of the Study:

• To assess the effectiveness of a computerized color vision test (Arden color contrast test) as a screening tool for DME.
• To compare the diagnostic performance of color vision testing with optical coherence tomography (OCT).

Main Methods:

• A prospective study included 83 eyes from 42 diabetic patients.
• Macular edema was evaluated using clinical grading and OCT.
• A computerized chromatest measuring protan and tritan axes was administered.
• Receiver operating characteristic (ROC) curves were used to analyze sensitivity and specificity.

Main Results:

• Optical coherence tomography (OCT) showed an area under the ROC curve (AUC) of 0.92.
• Color vision testing achieved an AUC of 0.82 for the tritan axis and 0.80 for the protan axis.
• OCT demonstrated 100% sensitivity at 39% specificity for DME detection.
• Color testing achieved 100% sensitivity but only 8% specificity for DME detection on the tritan axis.
• Tritan axis abnormalities correlated better with retinal thickness (r = 0.46).

Conclusions:

• Computerized color vision testing offers high sensitivity for detecting diabetic maculopathy.
• The specificity for identifying retinal macular edema is limited.
• Abnormalities in the tritan axis can occur in diabetic retinopathy before retinal thickening is evident.