====== Optic Disc Area ======

  * Disc Area remains largely stable throughout life but there are ethnic variations
  * Normal mean disc area is 2.27 mm² (st. dev ±0.412)
 
<WRAP round box 60%>
**Distribution of Disc Area from Marsh et al. 2010** {{::disc_area.png?600|}}
</WRAP>

<WRAP round box 60%> **Variation in Disc Area by Ethnicity from Girkin et al. 2011**
^ Area of Descent             ^ African      ^ European     ^ Hispanic     ^ Indian       ^ Japanese     ^
| Mean Disc Area in mm² (SD)  | 2.09 (0.41)  | 1.81 (0.38)  | 2.06 (0.37)  | 2.03 (0.31)  | 1.93 (0.37)  |
</WRAP>

====Conditions with abnormal disc area====
  * [[optic_nerve_hypoplasia|Optic nerve hypoplasia]]
  * [[megalopapilla|Megalopapilla]]
====Resources====
  * [[https://1drv.ms/b/c/31d83ae8e55e0542/EZGYBWdcTW1GtGVQIFkJqkkBQhyu3-p78HVOswwEmtKfpQ?e=tk9CKA|Marsh BC et al. Optic Nerve Head (ONH) Topographic Analysis by Stratus OCT in Normal Subjects: Correlation to Disc Size, Age, Ethnicity. J Glaucoma 2010;19(5):310-318]]
  * [[https://1drv.ms/b/c/31d83ae8e55e0542/Ed8k3dWlVbFHk-W9PSFoU7IBQZFGtZpWRAt9UOrXkzbTbw?e=XfSVCp|Girkin CA et al. Variation in Optic Nerve and Macular Structure with Age and Race with Spectral-Domain Optical Coherence Tomography. Ophthalmology 2011;118:2403-2408]]
  * [[https://1drv.ms/b/c/31d83ae8e55e0542/ETuJcb9DSVdBqJHF808IfUUBTppLzYTD6_1mrNPINHwE9w?e=AUbYxt|Table 2 from Girkin et al. Ophthalmology 2011;118:2403-2408]]
{{tag>optic_disc}}