====== 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>

====Resources====
  * {{::optic_nerve_head_onh_topographic_analysis_by_stratus_oct_in_normal_subjects-_correlation_to_disc_size_age_and_ethnicity.pdf |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}}
  * {{::variation_in_optic_nerve_and_macular_structure_with_age_and_race_with_spectral-domain_optical_coherence_tomography.pdf |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}}
  * {{::table_2_from_girkin_et_al_ophthalmology_2011.pdf |Table 2 from Girkin et al. Ophthalmology 2011;118:2403-2408}}
{{tag>optic_disc}}