Measuring the Cup-to-Disk Ratio – CDR

The Cup-to-Disc Ratio (CDR) measures the ratio between the areas of the cup and the disc of the optic nerve, aiding in the identification of glaucoma-related alterations.

To utilize this feature, select the desired image for analysis from the gallery. Next, click on the editing icon located at the top right corner of the screen, followed by selecting the CDR option on the bottom menu.

Follow these steps to measure the area of the optic nerve.

Usually, healthy eyes follow the rule Inferior ≥ Superior ≥ Nasal ≥ Temporal.

Along with the CDR measurement this feature also generates a dynamic graph showing the thickness of parts of the optic nerve, measured in micrometers (μm).