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Presentation type	E-poster
Title	Visual field defects in myopic eyes combining peripapillary staphyloma and gamma peripapillary atrophy

Purpose	To compare the proportion of visual field defects (VFDs) between eyes combining peripapillary staphyloma and gamma peripapillary atrophy either in the absence (combination) or presence (cavitation) of a peripapillary intrachoroidal cavitation. To compare the ovality index (OI) in these groups and to investigate whether the location of cavitations matches VFDs distribution, which might help differentiate glaucoma from myopia-related damages.
Methods	Using optical coherence tomography, eyes were sorted either as combination or cavitation. The proportion of VFDs and that of low OI (≤0.8) were compared between these groups. Using Garway-Heath’s method, the correlation between cavitations’ location and VFDs’ distribution was analyzed.
Results	74 eyes of 55 subjects were selected: 61 combinations, 13 cavitations. VFDs were more frequent in cavitation (62%) than in combination (12%) (Fisher, p<0.001) eyes. The mean OI was lower (0.6 versus 0.9), (Student, p<0.001) and the proportion of low OI was higher (77% versus 28%) (Fisher, p<0.001) in cavitation eyes. 25% of cavitation’s eyes with VFDs had clusters whose distribution matched the cavitation’s location in 50% of cases.
Conclusion	VFDs were significantly more frequent in cavitation eyes and in eyes with low OI, the latest being significantly more frequent in the cavitation group, suggesting higher strains. Exclusion criteria left too few eyes to draw a formal conclusion about cavitation-function’s matching. Studies including more patients are required.
Conflict of interest	No

Authors 1

Last name	DUGAUQUIER
Initials	A
Department	CUB- Hopital Erasme
City	Brussels

Authors 2

Last name	EHONGO
Initials	A
Department	CUB- Hopital Erasme
City	Brussels

Authors 3

Last name	KISMA
Initials	N
Department	CUB- Hopital Erasme
City	Brussels

Authors 4

Last name	TCHATCHOU TOMY
Initials	W
Department	CUB- Hopital Erasme
City	Brussels

Authors 5

Last name	ALAOUI MHAMMEDI
Initials	Y
Department	CUB- Hopital Erasme
City	Brussels

Authors 6

Last name	COPPENS
Initials	K
Department	Cosma consulting
City	Enghien

Authors 7

Last name	LEROY
Initials	K
Department	ULB
City	Brussels

Authors 8

Last name	BREMER
Initials	F
Department	CUB- Hopital Erasme
City	Brussels

Authors 9

Last name	NANA WANDJI
Initials	B
Department	ULB