This represents the thickness of the RNFL across the entire scan. Thousands of points are measured in a single OCT scan and these are plotted on a map using colors to represent thickness value. Warm colors, such as red and white, are relatively thicker areas of the RNFL, while cooler colors, such as green and blue represent relatively thinner areas of the RNFL. It is normal to have thick areas of the RNFL along the superior and inferior portions of the scan.