Figure 1.
Photomicrograph of the optic nerve head (staining: PAS); arrows #1 and #2: pia mater of the optic nerve; arrow #3: end of Bruch's membrane; arrow #4: projection of the outer margin of the pia mater of the optic nerve; Gamma zone: region between arrows #3 and #4; black star: beginning of dura mater of the optic nerve.
Figure 2.
Photomicrograph of a glaucomatous optic nerve head (staining: PAS).
Left: arrow #1 end of Bruch's membrane; arrow #2: beginning of choriocapillaris not occluded beneath Bruch's membrane; arrow #3: beginning retinal photoreceptors on Bruch's membrane; arrow #4: beginning of retinal pigment epithelium cells on Bruch's membrane. Right: higher magnification of beta zone; Black arrow: End of Bruch's membrane at the optic disc border; White arrow: open choriocapillaris; Red arrow: end of photoreceptor layer, choriocapillaris open.
Figure 3.
Photomicrograph of the optic nerve head (staining: PAS); arrows #1 and #2: pia mater of the optic nerve; arrows #3 and #4: peripapillary scleral flange as roof of the orbital cerebrospinal fluid space; black stars: dura mater of the optic nerve.
Figure 4.
Photomicrograph of a highly myopic optic nerve head (staining: PAS); black stars: inner border of the optic nerve; arrows #1: pia mater of the optic nerve; arrows #2: peripapillary scleral flange as roof of the widened orbital cerebrospinal fluid space; arrows #3: dura mater of the optic nerve; arrow #4: arterial circle of Zinn-Haller; A–B: Pia mater (potentially the “peripapillary scleral ring” upon ophthalmoscopy); B–C: Delta zone (no blood vessels >50 µm diameter within gamma zone); C–D: remaining Gamma zone (peripapillary sclera without overlying choroid, Bruch's membrane and deep retinal layers).
Figure 5.
Scatterplot showing the distribution size of gamma zone versus axial length (locally weighted scatterplot smoothing (LOESS) statistics).
Figure 6.
Scatterplot showing the distribution size of gamma zone versus thickness of the peripapillary scleral flange (locally weighted scatterplot smoothing (LOESS) statistics).
Figure 7.
Scatterplot showing the distribution size of gamma zone versus length of the peripapillary scleral flange (locally weighted scatterplot smoothing (LOESS) statistics).