The Mayer-Kran™ Double-Happy™ Low Contrast Test is intended for children and older individuals who are unable to name or match letters, that is, individuals who cannot be tested with standard letter contrast tests. The test cards are printed with a smiling schematic face offset from the center of the card; the face is identical when the card is rotated 180 deg. This format is like the Teller Acuity Cards* and enables testing using a similar procedure. The M-K Double-Happy Contrast Test is offered with two options: The Screening Set consists of 6 cards varying in Weber contrast: 89, 36, 25, 12.6, 6.3, 3.2, 2.2 The Full Set The M-K D-H full test set consists of 16 cards: 15 cards are printed with a schematic smiling face and the 16th 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

 

 

Starting at: $395.00

Product Variations

Reset Variations
SKU: N/A Categories: ,

Description

Assessment of contrast sensitivity (CS) is an important component of a comprehensive eye examination. The test should be administered by a vision health professional or a person trained in administering vision tests. The test results should be interpreted in the context of the individual’s overall presentation and the results of the individual’s eye examination. If the individual’s test shows abnormal results, we recommend retesting, preferably by a different tester who is unaware of the first tester’s results. A CS test does not replace the eye examination.

The Mayer-Kran™ Double-Happy™ Low Contrast Test consists of cards printed with a schematic smiling face. 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%).   (Screening set -2.2%, Full set -0.8%).  (The face contrast values are converted into log contrast sensitivity or logCS.)

The M-K Double-Happy Contrast Screening Test is offered with two options:

  • The Screening Set is a set of 6 cards varying in Weber contrast: 89, 36, 25, 12.6, 6.3, 3.2, 2.2
  • logCS Values are: 0.05, 0.45, 0.60, 0.90, 1.20, 1.50, 1.65   
  • The Full Set is a set of 16 cards 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
  • 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

The logCS values can be related to difficulties in visually guided activities in adults. For example, logCS values ≤ 0.9 may be associated with a serious disability in walking, ≤ 1.3 may result in significant difficulties in recognizing faces, and <1.4 may cause significant limitations in reading (see instructions for further references).

Instructions May be Downloaded as follows:
Full Set Instructions
Screening Set Instructions
Care and Handling Instructions

Behind The Test – Click here to read a question & answer session with the developers of Mayer-Kran™ Double-Happy™ Low Contrast Test

*Teller Acuity Cards® is a U.S. registered trademark of the University of Washington and used under license.