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Westcott Color Slide Test for Color Blindness. Created for CVCA Physics by Dick Heckathorn 29 May 2K+4. COLOR-BLINDNESS absolutely disqualifies a person for some vocations such as those connected with the railroads, the navy, color-photography or painting.

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westcott color slide test for color blindness

Westcott Color Slide Test forColor Blindness

Created for CVCA PhysicsbyDick Heckathorn29 May 2K+4

slide2
COLOR-BLINDNESS

absolutely disqualifies a personfor some vocations such

as those connected with the railroads, the navy,

color-photography

or painting.

slide3
Except in cases of an accident, color-blindness

dates from birth

and is due to a defect

in the retina of the eye

which cannot be remedied.

slide4
Color-blindness may be divided into two general classes

red-blindness and green-blindness

depending on which color

is absent in the color sense.

Sometimes both these colors are absent.

slide5
A third and rare form

is the violet-blind.

Of the human race

about 4% of males and

about one-fourth of 1% of females

are said to be blind to

red, or green, or to both.

slide6
Attention was brought

forcibly to the

danger of color-blindness

among railway employees

by a serious accident

in Sweden in 1875.

directions
DIRECTIONS

A Westcott slide

will now be used

for testing whether

you are color-blind or not.

slide8
Take out a pencil

and a piece of paper.

Once your instructor

begins to give directions,

NO questions or discussion

will be allowed

until the test is finished.

There is to be NO talking from now on.

test a
TEST A

On the paper write

the number of the

sample color(s)

that you think

are similar to

(Green) Color A.

slide10
You will find very few,

if any samples

exactly like Color A.

You are to include in this list

all greens whether tending

toward the yellow,

or toward the blue.

slide11

There are many

samples of color

on the slide

which should not be included

in any of the lists asked for.

slide12
Your instructor

will wait

until he senses

all are finished.

test b
TEST B

As before,

write the number of

the sample color(s)

that you think are similar to Rose (Color B).

test c
TEST C

This time

write the number of

the sample color(s)

that you think are similar to Rose (Color C).

for test a
For Test A

How many of these numbers

do you have on your list?

2

5

16

24

26

28

37

39

slide19
If you are color-blind,

whether to red or green,

you will include with the greens one or more grays, browns or roses,

and it is not uncommon for you

to include as many as

20 numbers in this list.

slide20
The presence of

any of the above

among the greens

betrays at once

that you have

a defective color sense

for either red or green.

slide21

For Test B

How many of these numbers

do you have on your list?

1

13

23

36

40

slide22
The red-blind selects

indifferently roses and blues,

while the green-blind

adds greens and grays.

The tendency of the color-blind

being always to select deeper colors.

slide23
Test C was used to confirm

the results of tests A and B.

slide24

For Test C

How many of these number

do you have on your list?

3

21

25

27

38

slide25
The red-blind will select the

reds, greens and browns

darker than the red.

The green-blind will add

greens and browns

lighter than the red.

slide26
Only the more marked cases

of color-blindness

are likely to show their defect

in this test.

slide27
Should this test indicate that you might have color blindness, contact your doctor for further investigation.