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Peripapillary arterial circle of Zinn-Haller: location and spatial relationships with myopia.

Jonas JB, Holbach L, Panda-Jonas S - PLoS ONE (2013)

Bottom Line: ZHAC distance to the peripapillary ring was not significantly associated with length of parapapillary beta zone (P=0.33).The distance between the ZHAC and the optic disc border is markedly enlarged in highly myopic eyes.Since the ZHAC is the main arterial source for the lamina cribrosa blood supply, the finding may be of interest for the pathogenesis of the increased glaucoma susceptibility in highly myopic eyes.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.

ABSTRACT

Purpose: To measure histomorphometrically the location of the peripapillary arterial circle of Zinn-Haller (ZHAC) and assess its associations with axial length.

Methods: Using a light microscope, we measured the distance from the ZHAC to the peripapillary ring (optic disc border), the merging point of the dura mater with the posterior sclera ("dura-sclera point"), and the inner scleral surface. In the parapapillary region, we differentiated between beta zone (presence of Bruch's membrane, absence of retinal pigment epithelium) and gamma zone (absence of Bruch's membrane). The peripapillary scleral flange as roof of the orbital cerebrospinal fluid space was the connection between the end of the lamina cribrosa and the posterior full-thickness sclera starting at the dura-sclera point.

Results: The study included 101 human globes (101 patients) with a mean axial length of 26.7 ± 3.7 mm (range: 20.0-39.0 mm). The distance between the ZHAC and the peripapillary ring increased significantly with longer axial length (P<0.001; correlation coefficient r=0.49), longer parapapillary gamma zone (P<0.001;r=0.85), longer (P<0.001;r=0.73) and thinner (P<0.001;r=-0.45) peripapillary scleral flange, and thinner sclera posterior to the equator (P<0.001). ZHAC distance to the peripapillary ring was not significantly associated with length of parapapillary beta zone (P=0.33). Including only non-highly myopic eyes (axial length <26.5 mm), the ZHAC distance to the disc border was not related with axial length (P=0.84). In non-highly myopic eyes, the ZHAC was located close to the dura-sclera point. With increasing axial length and decreasing thickness of the peripapillary scleral flange, the ZHAC was located closer to the inner scleral surface.

Conclusions: The distance between the ZHAC and the optic disc border is markedly enlarged in highly myopic eyes. Since the ZHAC is the main arterial source for the lamina cribrosa blood supply, the finding may be of interest for the pathogenesis of the increased glaucoma susceptibility in highly myopic eyes.

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Related in: MedlinePlus

Histophotograph showing the optic nerve head of a highly myopic eyes with the peripapillary arterial circle of Zinn-Haller (red arrow), located the merging point of the dura mater (black arrows) with the scleral at the end of the peripapillary scleral flange (between green arrows), the pia mater and the peripapillary ring as the continuation of the pia mater (between yellow arrows).
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pone-0078867-g002: Histophotograph showing the optic nerve head of a highly myopic eyes with the peripapillary arterial circle of Zinn-Haller (red arrow), located the merging point of the dura mater (black arrows) with the scleral at the end of the peripapillary scleral flange (between green arrows), the pia mater and the peripapillary ring as the continuation of the pia mater (between yellow arrows).

Mentions: In the non-highly myopic non-glaucomatous eyes, the mean distance between ZHAC and the peripapillary ring was 548±176 µm and ranged between 282 µm and 870 µm (Table 1). The ZHAC was located close to the dura-sclera point (Fig. 1, 2). Its distance to the inner scleral surface was 317±77 µm (Table 1). Within this non-highly myopic non-glaucomatous group, the distance ZHAC to peripapillary ring was not significantly associated with age (P = 0.10) nor axial length (P = 0.84).


Peripapillary arterial circle of Zinn-Haller: location and spatial relationships with myopia.

Jonas JB, Holbach L, Panda-Jonas S - PLoS ONE (2013)

Histophotograph showing the optic nerve head of a highly myopic eyes with the peripapillary arterial circle of Zinn-Haller (red arrow), located the merging point of the dura mater (black arrows) with the scleral at the end of the peripapillary scleral flange (between green arrows), the pia mater and the peripapillary ring as the continuation of the pia mater (between yellow arrows).
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3815204&req=5

pone-0078867-g002: Histophotograph showing the optic nerve head of a highly myopic eyes with the peripapillary arterial circle of Zinn-Haller (red arrow), located the merging point of the dura mater (black arrows) with the scleral at the end of the peripapillary scleral flange (between green arrows), the pia mater and the peripapillary ring as the continuation of the pia mater (between yellow arrows).
Mentions: In the non-highly myopic non-glaucomatous eyes, the mean distance between ZHAC and the peripapillary ring was 548±176 µm and ranged between 282 µm and 870 µm (Table 1). The ZHAC was located close to the dura-sclera point (Fig. 1, 2). Its distance to the inner scleral surface was 317±77 µm (Table 1). Within this non-highly myopic non-glaucomatous group, the distance ZHAC to peripapillary ring was not significantly associated with age (P = 0.10) nor axial length (P = 0.84).

Bottom Line: ZHAC distance to the peripapillary ring was not significantly associated with length of parapapillary beta zone (P=0.33).The distance between the ZHAC and the optic disc border is markedly enlarged in highly myopic eyes.Since the ZHAC is the main arterial source for the lamina cribrosa blood supply, the finding may be of interest for the pathogenesis of the increased glaucoma susceptibility in highly myopic eyes.

View Article: PubMed Central - PubMed

Affiliation: Department of Ophthalmology, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.

ABSTRACT

Purpose: To measure histomorphometrically the location of the peripapillary arterial circle of Zinn-Haller (ZHAC) and assess its associations with axial length.

Methods: Using a light microscope, we measured the distance from the ZHAC to the peripapillary ring (optic disc border), the merging point of the dura mater with the posterior sclera ("dura-sclera point"), and the inner scleral surface. In the parapapillary region, we differentiated between beta zone (presence of Bruch's membrane, absence of retinal pigment epithelium) and gamma zone (absence of Bruch's membrane). The peripapillary scleral flange as roof of the orbital cerebrospinal fluid space was the connection between the end of the lamina cribrosa and the posterior full-thickness sclera starting at the dura-sclera point.

Results: The study included 101 human globes (101 patients) with a mean axial length of 26.7 ± 3.7 mm (range: 20.0-39.0 mm). The distance between the ZHAC and the peripapillary ring increased significantly with longer axial length (P<0.001; correlation coefficient r=0.49), longer parapapillary gamma zone (P<0.001;r=0.85), longer (P<0.001;r=0.73) and thinner (P<0.001;r=-0.45) peripapillary scleral flange, and thinner sclera posterior to the equator (P<0.001). ZHAC distance to the peripapillary ring was not significantly associated with length of parapapillary beta zone (P=0.33). Including only non-highly myopic eyes (axial length <26.5 mm), the ZHAC distance to the disc border was not related with axial length (P=0.84). In non-highly myopic eyes, the ZHAC was located close to the dura-sclera point. With increasing axial length and decreasing thickness of the peripapillary scleral flange, the ZHAC was located closer to the inner scleral surface.

Conclusions: The distance between the ZHAC and the optic disc border is markedly enlarged in highly myopic eyes. Since the ZHAC is the main arterial source for the lamina cribrosa blood supply, the finding may be of interest for the pathogenesis of the increased glaucoma susceptibility in highly myopic eyes.

Show MeSH
Related in: MedlinePlus