BG-03 is a background illumination system is great in explaining diagnosis of the slit beam in anterior segments of eyes to patients. It does this by adopting a high-brightness LED separately from the halogen lamp which will be used as a light source of the slitlamp. And thanks to this lightsource, the background illuminator equipped with adjustable light intensity control makes it possible to obtain a clear image in good conditions. The illumination angle of the light can be changed and that is why the area of the image to be taken needs to be widened.