This is a test to measure the thickness of the retina. It gives a cross sectional view of the retina that is very useful for detecting subtle abnormalities.

Scan of the retina showing how OCT can image this structure
This is a test to measure the thickness of the retina. It gives a cross sectional view of the retina that is very useful for detecting subtle abnormalities.
Scan of the retina showing how OCT can image this structure