The eye is an amazing organ that allows us to see the outside world. It utilizes light waves, detecting their brightness and color. The eye contains structures like the iris, lens, retina and rods and cones that help it process light and send visual information to the brain. The retina in particular contains photoreceptive cells that are specialized for either low-light or daylight vision and color detection.

2.  Is one of the distal senses which utilizes the
physical characteristics of light.
 The eye is the receptor organ of vision, and
it is a very amazing device.
 What you know of your outside environment
comes from this important organ.

3.  The stimuli for seeing are light waves which
are waves of radiant energy coming from the
sun.
 They are described in terms of wave lengths
and the unit of measurement is the
millimicron (one million of a millimeter)

5. The Eye utilizes
Two Basic Properties of Light
Brightness
- the intensity of light
and is considered as the
amount of light energy
that the eye receives
Color
- The color of light is
determined by its
frequency or wavelength.

6.  Are very important organs and as such they
are well protected.
 The bony sockets, the eye lids. The eye
lashes and also the eye brows protect the
eyes.

8.  The cornea forms a bulge at the front of the
eye and since it is transparent light can enter
the eye.
 It serves as a protection of the eye.
 It is a white though membrane which is a
continuation of the sclera which is the
outermost protective coat of the eye.

9.  Is a group of muscles which operates by
reflex action and gives color of the eye.
 In a bright place, the contraction of the iris
makes the pupil smaller, thus controlling
much of the brightness of light.
 In a dim light, the iris expands and the pupil
becomes larger.

10.  Light then passes from the pupil to the lens
which can be adjusted by another group of
muscles to bring objects into focus.
 The lens adjust the light rays so that
whatever one is looking at is sharply focused
on the retina.

11.  It is the true organ of
vision.
 It is also the photo
sensitive area of the
eye.
 It has two receptor cells,
the rods and the cones,
so named for their
shapes.

12.  Are slender nerve cells.
 There are about 100 million rods distributed
unevenly on the retina of the eye.
 It is used for twilight vision or low intensity and
enable one to make colorless discrimination.
 Are sensitive to tiny amount of light.
 Only the rods are functioning when one sees in
very dim light.

13.  Are thicker and cone-
shaped.
 There are 6 million cones
distributed unevenly on
the retina of the eye.
 Are concentrated in the
center of the retina.
 Are used in for daytime
vision to enable one to
discriminate brightness
and hue or color.

14.  Fovea – is in the central region where cones
are concentrated.

15.  Blind spot – is the area where the nerve
fibers from all over the eye converge to form
the optic nerve that carry impulses to the
brain.

16.  When a person tries to
described or make a
report or what he has
seen, he usually tells
the color by using what
we called the three
dimension of color –
hue, brightness and
saturation

17.  Refers to the name of
colors.
 Follows the order from
violet which has the
shortest wave length to
red which has the longest
wavelength.

18.  It is the energy
source of light.
 It is also associated
with intensity of the
stimulus.
 Yellow as a hue
usually appears
brighter than red and
blue.

19.  Refers to the purity
or richest of color.
 Highly constructed
colors appear to be
pure hues and there
is no tint of gray
added.
 Colors of low
saturation appear
close to gray.