Translucent acrylic letter screening chart and optional illumination box
Kay Letter Test 6m Acrylic LogMAR Chart / Light Box
The Kay Letter Test 6 Metre Acrylic LogMAR Chart provides 6 Sloan letter optotypes in LogMAR sizing and Snellen equivalent sizes from 0.8 to -0.2 LogMAR (6/38 to 6/3.8 Snellen). The six letters have been carefully chosen to provide similar legibility with the need to differentiate similar shapes. This also gives the option to use a matching card if required.
Sizes 0.3 to -0.2 have 5 letters per line, giving the option to assign a LogMAR acuity score to each letter for the best repeatability. The LogMAR and Snellen scores provided on this chart are specific for a six metre test distance. If you use this chart at a different distance the scores will need to be adjusted accordingly. To test for acuity sizes worse that 0.8 (6/38) we recommend that you change your test distance to three metres which will add 3 additional LogMAR sizes. See more information in the scoring tab.
The Kay Letter Test 6 Metre Acrylic LogMAR Chart fits a standard large illuminated LED light box and four-sided rotating test type.
From the drop-down menu above, you can choose to purchase the chart together with the light box, light box with carry handle or light box with a wall bracket.
The lightweight LED illuminated box holds a single vision testing acrylic panel and has a spotlight below the panel. A manual side switch will select which section is illuminated. It comes with a 12V medical power plug and 2 metre lead to the right side of the unit. The box is white in colour and can be wall-hung, or stood on its feet plus integral stability bar. The LED illumination strips should last for 30-50,000 hours. Replacements can be fitted by the manufacturer.
This standard size acrylic chart will slide up for easy replacement, if required.
Country of origin: GB
Scoring at 3M
How to score visual acuity if using this six-metre chart at a three metre test distance:
LogMAR – add 0.3 to the LogMAR score shown on the chart, so a LogMAR score of 0.8 becomes 1.1; 0.7 become 1.0; and so on.
Snellen – either replace the numerator figure 6 with 3, so 6/38 size shown is 3/38 OR keep the numerator 6 and double the denominator figure, so 6/38 size shown is 6/72.
See our Visual Acuity Conversion Chart.
Disconnect the light box from mains!
This unit may be cleaned by wiping with a damp cloth and a weak solution of detergent/disinfectant. Please note, alcohol-based cleaning fluids should NOT be used.
Input: 100-240v/AC, 50-60Hz, 160-80mA
Output (to Evans unit): 12v/DC, 600mA, 7.2w
Due to the weight of the product there is an additional shipping cost of £12.00 for deliveries within the UK. Overseas charges may be higher.
Country of origin: GB