What does the FDT measure the function of?

The visual field test known as the Frequency Doubling Technology (FDT) specifically assesses the function of the retina. It is particularly sensitive to the health of the retinal ganglion cells, which are crucial for transmitting visual information from the eye to the brain. The FDT takes advantage of a phenomenon where certain visual stimuli can effectively 'double' frequencies at specific thresholds, allowing for the detection of early dysfunction in the retinal pathways, often linked to conditions such as glaucoma.

By focusing on how the retina responds to specific visual stimuli, the FDT serves as an important diagnostic tool for identifying potential retinal issues before more significant vision problems arise. Understanding this connection between the FDT test and retinal function helps reinforce the importance of early detection in preserving visual health.