In this episode, I talk with Gus DeMoraes, a frequent guest of the pod. Gus is Associate Professor of Ophthalmology at Columbia University where he serves as Medical Director of Clinical Trials. When we originally sat down to record this way back in March 2019, he had just presented some of the work he had done in collaboration with Don Hood. This has now appeared on Humphrey perimeters as the 24-2C testing strategy and is becoming a new the standard of care. It is based on reports in recent years that glaucoma damage often occurs in the macular area but missed because the standard 24-2 testing strategy only tests in 6 degree increments. These early central glaucomatous defects are often hidden between the test points.