The Eye

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.