Vacuum coating unit and a method for the differentiated coating of spectacle lenses

A vacuum coating unit for simultaneously coating a plurality of substrates in a vacuum chamber, comprising:

• an evaporation crucible defining a vertical axis of symmetry;
• a substrate holder formed as a dome disposed above said evaporation crucible and having an underside configured to hold a plurality of substrates at radially equal intervals on circles about a vertical axis of symmetry of said evaporator crucible and stationary relative to said dome;
• a rotary drive for rotating said dome about said axis of symmetry, whereby the substrates are moved on circular paths about said axis of symmetry;
• and
• screens disposed to partially shadow the substrates relative to said evaporation crucible, said screens forming a continuous aperture ring for each respective ring of substrates, and said aperture ring being disposed, circumferentially relative to said axis of symmetry, within an cone formed between said evaporator crucible and said dome.