Normal fovea thickness map color and microns?

Normal fovea thickness map color and microns?

• A. Blue 170-190 microns
• B. Yellow 220-240 microns
• C. Red 200-220 microns
• D. Green 150-170 microns

Answer: (A)

On OCT thickness maps, colors are tied to thickness values: cooler colors (like blue) indicate thinner tissue, while warmer colors (green to red) indicate thicker tissue. The fovea is the thinnest part of the retina, so a normal fovea tends to appear in the coolest color band. The typical central foveal thickness for a healthy eye falls around 170–190 microns, which is why the blue color corresponding to 170–190 microns is used to represent normal fovea thickness. Values thicker than that (toward 200–240 microns) would appear in warmer colors and suggest thicker retina, not normal. Therefore, the blue band at about 170–190 microns best matches a normal fovea.

On OCT thickness maps, colors are tied to thickness values: cooler colors (like blue) indicate thinner tissue, while warmer colors (green to red) indicate thicker tissue. The fovea is the thinnest part of the retina, so a normal fovea tends to appear in the coolest color band. The typical central foveal thickness for a healthy eye falls around 170–190 microns, which is why the blue color corresponding to 170–190 microns is used to represent normal fovea thickness. Values thicker than that (toward 200–240 microns) would appear in warmer colors and suggest thicker retina, not normal. Therefore, the blue band at about 170–190 microns best matches a normal fovea.