i used to think that colourblindness is just viewing things in black and white like a black and white television. Apparently its not the case. Such cases, are extremely rare.
Just today we were tested for colour blindness in school. my results came out positive.
The nurses tested me with pseudo-isochromatic plates use printed dots of different chromaticity to produce patterns that can be identified as numbers, letters or shapes.
TEST ATEST B
TEST C TEST D
to determine which colour blindness deficientcy i suffered from, they carried on with another test procedure.
Step 1: A color vision test pattern for testing red/green deficiency starts from a random pattern of gray level dots. Step 2: We now add a digit pattern which is defined by yellow/blue variation only. This pattern can be detected by any observer which is able to do yellow/blue discrimination. Since most people with red/green deficiency will be able to do yellow/blue discrimination they will be able to see the digit 5 in this test pattern.
Step 3: Now we add another digit pattern which is defined by red/green variation and is easier to see than the pattern defined by yellow/blue variation. Here is the pattern composed of the random brightness pattern and the red/green pattern:
Step 4: Finally we add all three components: the random brightness pattern, the yellow/blue pattern, and the red/green pattern. Observers with red/green deficiency will not be able to see the red/green pattern and base their response on the yellow/blue pattern only. Normal observers will see both the yellow/blue and the red/green pattern. Since the red/green pattern is stronger than the yellow/blue pattern the normal subject will base his or her judgment on the red/green pattern and see the digit 6.
STEP 1 STEP 2
STEP3 STEP4
Its really unfortunate that i have colourblindness Afterall its more common in males then females
Regardless, I will find out about colour blindness another time from the specialist.
