A
pterygium
is
an
elevated
,
superficial
,
____________________
ocular
mass
that
usually
forms
over
____________________
perilimbal
conjunctiva
and
extends
onto
the
corneal
____________________
.
Pterygia
can
develop
on
the
nasal
and
/
or
temporal
____________________
and
can
affect
either
or
both
eyes
.
Pterygia
can
____________________
from
small
,
atrophic
quiescent
lesions
to
large
,
aggressive
,
rapidly
growing
fibrovascular
lesions
that
can
distort
the
corneal
____________________
,
and
,
in
advanced
cases
,
they
can
obscure
the
____________________
center
of
the
corne
a
