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This abstract is assigned to session AOB Poster session 2 - Inflammatory pathology – Anterior segment – Ophthalmogenetics - Miscellaneous

Title	Comparing Ultrasound Biomicroscopy (UBM) and Anterior Segment Optical Coherence Tomography (AS-OCT) for imaging conjunctival nevi
Abstract Nr.	2030

Purpose	To compare UBM and AS-OCT in the evaluation of conjunctival nevi.
Methods	Prospective, observational, non-randomized trial. We examined 16 eyes of 15 consecutive patients with conjunctival nevi.
Results	The visualization of the margins of the nevus was categorized as good, fair or poor. There was a good resolution in 100% of anterior margins for both UBM and AS-OCT cases. On UBM and AS-OCT the posterior margin had a good or fair resolution in 100% and 81%, respectively. Except for 1 UBM image and 1 AS-OCT image, all AS-OCT and UBM images had a good or fair resolution of the lateral margins. AS-OCT was able to visualize the nevi with a better resolution than UBM. Some degree of deep optical shadowing was seen on all AS-OCT images, but it only hindered good visualization of the posterior margin in 3 cases. Intrinsic cysts were seen in 6 cases (36%) with UBM and in 13 cases (81%) with AS-OCT, not necessarily in the same cases.
Conclusion	UBM and AS-OCT have the ability to accurately visualize the anterior and posterior margins although AS-OCT is more accurate in visualizing details. AS-OCT is more patient friendly but it has the disadvantage of deep optical shadowing, especially in thick nevi. We would advise to document conjunctival nevi with photographs and AS-OCT first and to use UBM only when the nevus is too thick to visualize the posterior margin with AS-OCT.
Conflict of interest	No

Authors 1

Last name	MERTENS
Initials	M
Department	University of Antwerp
City	Antwerp

Authors 2

Last name	Janssens
Initials	K
Department	University of Antwerp
City	Antwerp

Authors 3

Last name	Lauwers
Initials	N
Department	Department of ophthalmology, University Hospital of Antwerp
City	Edegem

Authors 4

Last name	De Keizer
Initials	RJW
Department	Department of ophthalmology, University Hospital of Antwerp
City	Edegem

Authors 5

Last name	De Groot
Initials	V
Department	Department of ophthalmology, University Hospital of Antwerp
City	Edegem