large magnification values and small magnifier models. What is a Fresnellens? The Fresnellens refracts the light like a conventional lens, but does not consist of a smooth, curved surface - but different [...] lukewarm water. Never use alcohol-based solvents or organic solvents to clean the lens as these could destroy the lens. Is it possible to change the LEDs on an LED magnifier? The LEDs used for illuminating [...] required, the white/blue light can be toned down by using a filter cap. What is an aspheric lens? An aspheric lens has a refractive surface geometry which is not in the form of a sphere. The image quality