Here we describe our product “LUVIS mini“ – the light box for vision charts in small formats. LUVIS mini is able to be used ideally with the MARS contrast charts. Simply apply these 3 steps:
- put four magnetic strips on the back of the chart
- place the chart in the LUVIS mini
- turn on the LUVIS mini and test contrast vision faultlessly
In the matter of design the inventing team has stuck to the indications of DIN EN ISO 8596 – it describes under which conditions vision and contrast test should be performed.
Important: Homogeneous illumination, as required by the DIN EN ISO 8596, is not possible to be achieved with conventional room lighting.
Both LED strips illuminate the box homogeneously. Thereby the light is shed on the chart in a way that no reflection occurs. Furthermore the case offers protection against incident light. Anyone who has tried to illumiate contrast charts with conventional lighting know about these difficulties. The result depends in that case on criteria for which as a specialist you have to be responsible. With LUVIS mini all the risks are gone!
The meaning of the ISO 8596
According to the DIN EN ISO 8596 a background luminance (luminance between the optotypes) between 80 and 320 cd/m2 with high contrast to the optotypes is indicated for the vision test. This range is also recommended for the screening of photopic contrast sensitivity. The acceptable tolerance is indicated with ±25 %.
With LUVIS mini you will achieve a tolerance of ±3 % all over the chart! Consequently this means that a letter on the top left does not appear 6 % lighter or darker than a letter on the bottom right.
technical details of the LUVIS mini
|illumination:||With LED, 12V, white 4500K|
|luminance||appr. 200 cd/m²|
|for charts in the format:||up to appr. 38 x 28 cm|
|power supply:||with power cord (100 – 240V)|
|wall installation:||with two loops on the rear|
|set up without base:||on a flat surface or a stand|
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