Graded areas of interest in spectral domain optical coherence tomography in patients with geographic atrophy
| Area 1 | Area of intensive choroidal signal enhancement |
| Area 2 | Area of moderate choroidal signal enhancement |
| Area 3 | Area of complete absence of the retinal pigment epithelium |
| Area 4 | Area of thinning of the retinal pigment epithelium |
| Area 5 | Area of thinning and shifting of the outer plexiform layer |
| Area 6 | Area of loss of the outer plexiform layer |
| Area 7 | Area of loss of the external limiting membrane |
| Area 8 | Area of intensive thickening of the retinal pigment epithelium band in the junctional zone |
| Area 9 | Area of moderate thickening of the retinal pigment epithelium band in the junctional zone |