Translucent acrylic letter screening chart and optional illumination box
Kay Letter Test 3m Acrylic LogMAR Chart / Light Box
Kay Letter Test 3 Metre Acrylic LogMAR Chart provides 6 Sloan letter optotypes in LogMAR sizing and Snellen equivalent sizes from 1.0 to -0.2 LogMAR (3/30 to 3/1.9 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 0.6 to -0.2 have 5 letters per line, giving the option to assign a LogMAR acuity score to each letter for the best repeatability. Snellen equivalent sizes are written in the three-metre format but can easily be converted to a six-metre notation if preferred, by multiplying both numerator and denominator figures by two. For example, a score of 3/12 could be written as 6/24.
The LogMAR and Snellen scores provided on this chart are specific for a three-metre test distance. If you use this chart at a different distance the scores will need to be adjusted accordingly. See our Visual Acuity Conversion Chart.
The chart fits a standard large Evans 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 Evans 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
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