Color vision is very important for human eyes. all details about color vision, definition, classification, abnormalities and color vision test details are given in slides

1. Written by:
Muhammad Akbar
Rashid Qadri
(BSVS, MS HCM)
Color Vision

2. Introduction
Colour sense is the ability of the eye to discriminate
between colours excited by light of different wave
lengths

3. Properties
Color vision is a function of cones. (seen better
in photopic vision)
Our eyes perceive color with wavelength of
light ranging from400 to 700nm.

4. Main / Basic Colors
Colours are formed from the mixture of basic
colours of Red, Blue and Green

5. Vision Types
Achromatic
(vision with no color vision)
Chromatic
(vision with color vision)

6. Types of colors
Primary color
Blue, Green, Red and mixing of three colors
Complementary color
When two colors are mixed in appropriate amount
it cancel the colors and produces white sensation

7. Color Blindness
Inability on the part of an individual to
recognize the colors is called color blindness

8. Classification
1. Trichromats
2. Dichromats
3. Monochromats

9. Trichromats
These are the people with weakness for one primary
colour. Accordingly, these are classified into:
I. Protanomolous (Weakness to red colour)
II. Deuteranomalous (Weakness to green colour )
III. Tritanomalous (weakness to blue clolour)

10. Dichromats
These are the individuals with two cones
Classified as
I. Protanopia (blindness to red)
II. Deuteranopia (blindness to green)
III. Tritanopia — blindness to blue)

11. Monochromats
They have only one cone system
These people can see black & white and shades of
grey.

12. Tests For Color Vision
1) Ishihara charts
2) Holmgren wool test
3) Eldridge green lantern
4) Eldridge green lantern

13. Significance of Color Vision
a) Pilots
b) Navigators
c) vehicle drivers
d) Railway etc