<s>
Fluorescein	B-Algorithm
angiography	I-Algorithm
(	O
FA	O
)	O
,	O
fluorescent	B-Algorithm
angiography	I-Algorithm
(	O
FAG	O
)	O
,	O
or	O
fundus	B-Algorithm
fluorescein	I-Algorithm
angiography	I-Algorithm
(	O
FFA	O
)	O
is	O
a	O
technique	O
for	O
examining	O
the	O
circulation	O
of	O
the	O
retina	O
and	O
choroid	O
(	O
parts	O
of	O
the	O
fundus	O
)	O
using	O
a	O
fluorescent	O
dye	O
and	O
a	O
specialized	O
camera	O
.	O
</s>
<s>
The	O
fluorescein	O
is	O
administered	O
intravenously	O
in	O
intravenous	B-Algorithm
fluorescein	I-Algorithm
angiography	I-Algorithm
(	O
IVFA	B-Algorithm
)	O
and	O
orally	O
in	O
oral	O
fluorescein	B-Algorithm
angiography	I-Algorithm
(	O
OFA	O
)	O
.	O
</s>
<s>
Fluorescein	B-Algorithm
angiography	I-Algorithm
is	O
one	O
of	O
several	O
health	O
care	O
applications	O
of	O
this	O
dye	O
,	O
all	O
of	O
which	O
have	O
a	O
risk	O
of	O
severe	O
adverse	O
effects	O
.	O
</s>
<s>
Fluorescein	B-Algorithm
angiography	I-Algorithm
does	O
not	O
involve	O
the	O
use	O
of	O
ionizing	O
radiation	O
.	O
</s>
<s>
Fluorescein	B-Algorithm
angiography	I-Algorithm
was	O
pioneered	O
by	O
German	O
ophthalmologist	O
Achim	O
Wessing	O
,	O
who	O
published	O
his	O
findings	O
in	O
1969	O
.	O
</s>
<s>
Fluorescein	B-Algorithm
angiography	I-Algorithm
is	O
used	O
by	O
physicians	O
specializing	O
in	O
the	O
treatment	O
of	O
eye	O
diseases	O
(	O
ophthalmologists	O
)	O
to	O
evaluate	O
the	O
vasculature	O
of	O
the	O
retina	O
,	O
choroid	O
,	O
optic	O
disc	O
,	O
and	O
iris	O
.	O
</s>
<s>
Among	O
the	O
common	O
groups	O
of	O
ophthalmologic	O
disease	O
,	O
fluorescein	B-Algorithm
angiography	I-Algorithm
can	O
detect	O
diabetic	O
retinopathy	O
(	O
neovascularization	O
)	O
,	O
vein	O
occlusions	O
,	O
retinal	O
artery	O
occlusions	O
,	O
edema	O
of	O
the	O
optic	O
disc	O
,	O
and	O
tumors	O
.	O
</s>
