Low Contrast Test for children and those unable to name or match letters
Mayer-Kran™ Double-Happy™ Low Contrast Test
From £485.00
Description
The Mayer-Kran™ Double-Happy™ Low Contrast Test consists of cards printed with a schematic smiling face offset from the centre of the card. The face is identical when the card is rotated 180°.
The face elements on each card are darker than the white card. The darkness of the face relative to the background is calibrated in percent contrast (Weber formula). Contrasts range from nearly black (89%) to very dim (2.2%). The face contrast values are converted into log contrast sensitivity or logCS.
You can choose between the Full or Screening Set from the drop-down menu.
The Screening Test consists of 6 cards varying in Weber contrast: 89, 36, 25, 12.6, 6.3, 3.2, 2.2.
The logCS Values are: 0.05, 0.45, 0.60, 0.90, 1.20, 1.50, 1.65
The Full Test consists of 16 cards; 15 cards are printed and the final card is blank.
The contrast values are varying in Weber contrast: 89, 71, 50, 36, 25, 17.8, 12.6, 8.9, 6.3, 4.5, 3.2, 2.2, 1.6, 1.1, 0.8, Blank
The logCS Values are: 0.05, 0.15, 0.30, 0.45, 0.60, 0.75, 0.90, 1.05, 1.20, 1.35, 1.50, 1.65, 1.80, 1.95, 2.1
Country of origin: US
Details
| Weight | 0.450 kg |
|---|---|
| Dimensions | 41 × 30 × 15 cm |
Instructions
Download the instructions by clicking on the set below.
Cleaning
View detailed care and handling instructions here.
Shipping
We aim to ship this product within 2 weeks of order placement.
