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Definition of retina
Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of retina is as below...
Retina
(n.) The
delicate
membrane
by which the back part of the globe of the eye is
lined,
and in which the
fibers
of the optic nerve
terminate.
See Eye..
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Rhodophane
::
Rhodophane
(n.) The red
pigment
contained
in the inner
segments
of the cones of the
retina
in
animals.
See
Chromophane.
Ophthalmoscope
::
Ophthalmoscope
(n.) An
instrument
for
viewing
the
interior
of the eye,
particularly
the
retina.
Light is
thrown
into the eye by a
mirror
(usually
concave)
and the
interior
is then
examined
with or
without
the aid of a
lens..
Phenakistoscope
::
Phenakistoscope
(n.) A
revolving
disk on which
figures
drawn in
different
relative
attitudes
are seen
successively,
so as to
produce
the
appearance
of an
object
in
actual
motion,
as an
animal
leaping,
etc., in
consequence
of the
persistence
of the
successive
visual
impressions
of the
retina.
It is often
arranged
so that the
figures
may be
projected
upon a
screen..
Retina
::
Retina
(n.) The
delicate
membrane
by which the back part of the globe of the eye is
lined,
and in which the
fibers
of the optic nerve
terminate.
See Eye..
Retinasphalt
::
Retinasphalt
(n.) Alt. of
Retinasphaltu.
Phosphene
::
Phosphene
(n.) A
luminous
impression
produced
through
excitation
of the
retina
by some cause other than the
impingement
upon it of rays of
light,
as by
pressure
upon the
eyeball
when the lids are
closed.
Cf.
After-image..
Myopia
::
Myopia
(n.)
Nearsightedness;
shortsightedness;
a
condition
of the eye in which the rays from
distant
object
are
brought
to a focus
before
they reach the
retina,
and hence form an
indistinct
image;
while the rays from very near
objects
are
normally
converged
so as to
produce
a
distinct
image.
It is
corrected
by the use of a
concave
lens..
Image
::
Image (n.) The
figure
or
picture
of any
object
formed
at the focus of a lens or
mirror,
by rays of light from the
several
points
of the
object
symmetrically
refracted
or
reflected
to
corresponding
points
in such
focus;
this may be
received
on a
screen,
a
photographic
plate,
or the
retina
of the eye, and
viewed
directly
by the eye, or with an
eyeglass,
as in the
telescope
and
microscope;
the
likeness
of an
object
formed
by
reflection;
as, to see one's image in a
mirror..
Retinaculum
::
Retinaculum
(n.) A
connecting
band; a
fraenum;
as, the
retinacula
of the
ileocaecal
and
ileocolic
valves..
Retinoscopy
::
Retinoscopy
(n.) The study of the
retina
of the eye by means of the
ophthalmoscope.
Vision
::
Vision
(v.) The
faculty
of
seeing;
sight;
one of the five
senses,
by which
colors
and the
physical
qualities
of
external
objects
are
appreciated
as a
result
of the
stimulating
action
of light on the
sensitive
retina,
an
expansion
of the optic
nerve..
Xanthophane
::
Xanthophane
(n.) The
yellow
pigment
present
in the inner
segments
of the
retina
in
animals.
See
Chromophane.
Retinaculum
::
Retinaculum
(n.) One of the
retractor
muscles
of the
proboscis
of
certain
worms.
Retinaculum
::
Retinaculum
(n.) One of the
annular
ligaments
which hold the
tendons
close to the bones at the
larger
joints,
as at the wrist and
ankle..
Retinaculum
::
Retinaculum
(n.) A small gland or
process
to which
bodies
are
attached;
as, the
glandular
retinacula
to which the
pollinia
of
orchids
are
attached,
or the hooks which
support
the seeds in many
acanthaceous
plants..
Chromophane
::
Chromophane
(n.) A
general
name for the
several
coloring
matters,
red,
green,
yellow,
etc.,
present
in the inner
segments
in the cones of the
retina,
held in
solution
by fats, and
slowly
decolorized
by
light;
distinct
from the
photochemical
pigments
of the rods of the
retina..
Optogram
::
Optogram
(n.) An image of
external
objects
fixed on the
retina
by the
photochemical
action
of light on the
visual
purple.
See
Optography.
Chlorophane
::
Chlorophane
(n.) The
yellowish
green
pigment
in the inner
segment
of the cones of the
retina.
See
Chromophane.
Fuscin
::
Fuscin
(n.) A
brown,
nitrogenous
pigment
contained
in the
retinal
epithelium;
a
variety
of
melanin..
Optical
::
Optical
(a.) Of or
pertaining
to the eye;
ocular;
as, the optic
nerves
(the first pair of
cranial
nerves)
which are
distributed
to the
retina.
See
Illust.
of
Brain,
and Eye..
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