====== Optic Nerve Drusen ======

==== Etiology ====

====Testing====
===Fundus Auto Fluorescence===

{{::faf_on_drusen.png?600|}}\\
-From Johanna Dijkstal Beebe, MD "The Optic Nerve is Swollen, but Retinal Nerve Fiber Layer is Thin" AAO 2024 

===CT Scan===
{{::ct_scan_on_drusen.png?600|}}\\
-From Johanna Dijkstal Beebe, MD "The Optic Nerve is Swollen, but Retinal Nerve Fiber Layer is Thin" AAO 2024 

===OCT Optic Nerve===
- usually normal segmentation
- may have temporal thinning 
- Distinguish from [[https://eyewiki.org/Peripapillary_Hyperreflective_Ovoid_Mass-Like_Structures_(PHOMS)|Peripapillary Hyperreflective Ovid Mass-like Structures]] (PHOMS) 

{{::phoms_vs_on_drusen.png?600|}}

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{{::drusen.jpg?600|}}

**[[https://www.clinicalkey.com/#!/content/1-s2.0-S0161642024001994|Interest of Retromode Imaging in the Visualization of Optic Nerve Head Drusen]]**\\
David H. Martiano MD, FEBO and Sebastien Massonnet\\
Ophthalmology, Copyright © 2024 American Academy of Ophthalmology
<file>
A 28-year-old woman was referred for multimodal imaging (Nidek, Mirante) of asymptomatic optic nerve head drusen. 
A - Retromode imaging was performed and demonstrated the limits and number of optic nerve head drusen, which seem to be organized in a grape-like network of different sizes and densities. 
B - Color fundus photography showed fuzzy papillary margins (pseudoedema). 
C - Autofluorescence photography showed diffuse hyper-autofluorescence of the drusen. 
D - Performing OCT B-scan was useful to present the different densities of the drusen, which appear as circular structures. 
(Magnified version of Figure A - D is available online at www.aaojournal.org ). </file>