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OPTOM FASLU MUHAMMED
Color vision: Is the capacity of an organism or
machine to distinguish objects based on the
wavelengths or frequencies of the light they
reflect or omit.
Color visionis a function of cones and better
appreciated in photopic vision.
Hue Is the identification of color.
Brightness Is the intensity of color.
Saturation Is the purity of a color.
THEORIES OF COLOR VISION
 Also called as YOUNG-HELMHOLTZ THEORY.
 The existence of three kinds of cones, each
containing a different photo pigments and
maximally sensitive to one of three primary
colors RED,GREEN and BLUE.
RED sensitive cone pigment /ERYTHROLABE or
long wavelength sensitive (LWS)
GREEN sensitive cone pigment /CHLOROLAB or
medium wavelength sensitive (MWS)
BLUE sensitive cone pigments /CYANOLAB or
short wave length sensitive.
Therefore, color vision is
the consequence of
unequal stimulation of
the 3 types of cones. In
a specific ratio.
Example : If you stimulate
all 3 types of cones
about equally the result
is white or no color.
 By HERING
 Some colors appear to be mutually exclusive.
Red with green
Yellow with blue.
COLOR BLINDNESS
 An individual with normal color vision is known as
TRICHOMATE.
 In color blindness, faculty to appreciate one or
more primary colors is either defective
(anomalous) or absent (anopia)
 It may be congenital or acquired
 X –linked recessive inherited condition.
Affecting males(3-4%) more than females(0.4%)
It may be
Dyschromatopsia
Achromatopsia
 Color confusion due to deficiency of mechanism to
perceive colors.
 It can be classified in to :-
Anomalous Trichromatism
Dichromatism
 The mechanism to appreciate all the three primary
color is present but is defective for one or two of
them.
Protanomalous:- defective red color
appreciation.
Deuteranomalous:-defective green color
Tritanomalous:- defective blue color
 One of the three primary color is completely
absent. such individual are called Dichromate.
 Protanopia :-complete red color defect
 Deutreranopia :-complete green color defect.
 Tritanopia :- complete blue color defect.
 It is an extremely rare condition.
CONE MONOCHROMATISM
ROD MONOCHROMATISM
 Presence of only one color and thus the person is
truly color blind.
 Visual acuity of 6/12 or better.
Complete or incomplete
Total color blindness
Day blindness (Visual acuity is about 6/60)
Nystagmus
Funds is usually normal.
 Damage to macula or optic nerve.
Associated with a central scotoma or decreased
visual acuity.
These are the colours of the rainbow and also what
they would look like if you were colour blind
 This is what a normal person would see as the
colours of the rainbow
 This is the same picture viewed by someone with
protanopia.
 This is the same picture viewed by someone with
deuteranopia
 This is the same picture viewed by someone with
tritanopia
 This is the same picture viewed by someone with
Monochromacy which Is full colour blindness
THANK YOU

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colour vision

  • 2. Color vision: Is the capacity of an organism or machine to distinguish objects based on the wavelengths or frequencies of the light they reflect or omit. Color visionis a function of cones and better appreciated in photopic vision.
  • 3. Hue Is the identification of color. Brightness Is the intensity of color. Saturation Is the purity of a color.
  • 5.  Also called as YOUNG-HELMHOLTZ THEORY.  The existence of three kinds of cones, each containing a different photo pigments and maximally sensitive to one of three primary colors RED,GREEN and BLUE.
  • 6. RED sensitive cone pigment /ERYTHROLABE or long wavelength sensitive (LWS) GREEN sensitive cone pigment /CHLOROLAB or medium wavelength sensitive (MWS) BLUE sensitive cone pigments /CYANOLAB or short wave length sensitive.
  • 7. Therefore, color vision is the consequence of unequal stimulation of the 3 types of cones. In a specific ratio. Example : If you stimulate all 3 types of cones about equally the result is white or no color.
  • 8.  By HERING  Some colors appear to be mutually exclusive. Red with green Yellow with blue.
  • 10.  An individual with normal color vision is known as TRICHOMATE.  In color blindness, faculty to appreciate one or more primary colors is either defective (anomalous) or absent (anopia)  It may be congenital or acquired
  • 11.  X –linked recessive inherited condition. Affecting males(3-4%) more than females(0.4%) It may be Dyschromatopsia Achromatopsia
  • 12.  Color confusion due to deficiency of mechanism to perceive colors.  It can be classified in to :- Anomalous Trichromatism Dichromatism
  • 13.  The mechanism to appreciate all the three primary color is present but is defective for one or two of them. Protanomalous:- defective red color appreciation. Deuteranomalous:-defective green color Tritanomalous:- defective blue color
  • 14.  One of the three primary color is completely absent. such individual are called Dichromate.  Protanopia :-complete red color defect  Deutreranopia :-complete green color defect.  Tritanopia :- complete blue color defect.
  • 15.  It is an extremely rare condition. CONE MONOCHROMATISM ROD MONOCHROMATISM
  • 16.  Presence of only one color and thus the person is truly color blind.  Visual acuity of 6/12 or better.
  • 17. Complete or incomplete Total color blindness Day blindness (Visual acuity is about 6/60) Nystagmus Funds is usually normal.
  • 18.  Damage to macula or optic nerve. Associated with a central scotoma or decreased visual acuity.
  • 19. These are the colours of the rainbow and also what they would look like if you were colour blind  This is what a normal person would see as the colours of the rainbow
  • 20.  This is the same picture viewed by someone with protanopia.  This is the same picture viewed by someone with deuteranopia
  • 21.  This is the same picture viewed by someone with tritanopia  This is the same picture viewed by someone with Monochromacy which Is full colour blindness