| The Cardiff Contrast Test - Specification
Each card of the Cardiff Contrast Test measures approximately
20 by 27 cm. A set comprises 12 contrast levels (36 cards) and
is supplied in a portable carry case with full instruction manual.
The contrast and contrast sensitivity values for the cards
are given in the following table:
| Card |
Picture |
Contrast (%) |
Contrast Sensitivity |
| A |
House |
46 |
2.17 |
| B |
Train |
32 |
3.13 |
| C |
Boat |
22 |
4.55 |
| D |
Duck |
16 |
6.25 |
| E |
Train |
12 |
8.33 |
| F |
Car |
8 |
12.5 |
| G |
Fish |
6 |
16.67 |
| H |
Boat |
4 |
25 |
| I |
Duck |
3 |
33.33 |
| J |
House |
2 |
50 |
| K |
Car |
1.5 |
66.66 |
| L |
Train |
1 |
100 |
Table 2 presents expected monocular values for contrast sensitivity
in children with normally developing vision, measured with the
Cardiff Contrast test at 50cm. These figures are taken from
a study with a population of children aged 1 to 3 years carried
out in Cardiff.
| Age group |
N |
Lower Limit |
Upper Limit |
| 1-2 yrs |
14 |
25 |
66.66 |
| 2-3 yrs |
14 |
33.33 |
100 |
| 3-4 yrs |
21 |
16.70 |
100 |
| 4-6.5 yrs |
16 |
50 |
100 |
Table 3 presents expected binocular values for contrast sensitivity
in children with normally developing vision, measured with the
Cardiff Contrast test at 50cm.
| Age group |
N |
Lower Limit |
Upper Limit |
| 1-2 yrs |
54 |
6.25 |
100 |
| 2-3 yrs |
28 |
33.33 |
100 |
| 3-4 yrs |
35 |
33.33 |
100 |
| 4-6.5 yrs |
21 |
50 |
100 |
|
