change the LEDs on an LED magnifier? The LEDs used for illuminating Eschenbach Optik products have a virtually unlimited service life. They therefore do not need to be changed. What can I do if my LED magnifier [...] visual acuity. What are cut-off filters? In contrast to sun protection filters, which reduce the overall visible light in a relatively even manner, cut-off filters only filter out a specific area of the spectrum [...] polarisation filter improve my vision? The light rays emitted from a light source oscillate in waves which are scattered in all directions. A polarisation filter in a spectacle lens filters out all oscillating