Device for testing spectacle lenses for material and surface defects has faint black housing in which point light source is present which is firm component of device and this point light source is not visible directly for users

摘要

The device has a faint black housing (10) in which a point light source (1) is present which is the firm component of the device and this point light source is not visible directly for the users. Apart from this point light source, there is also a test light source (2), which is covered in an adjustable cover plate.