Coated optical substrates having first and second groups of functional dots having different functionalities and micrometer height difference

An optical device comprising:

• (a) an optical substrate;
• (b) at least one multi-functional layer, fixedly attached to a broad optical surface of said optical substrate;
• said multi-functional layer including a plurality of multi-functional areas, each area of said multi-functional areas including functional dots, each of said functional dots fractionally covering said area;
• each area of said multi-functional areas disposed within a rectangular projection normally projecting from a direction of said layer, onto said broad optical surface, said rectangular projection having a contiguous area of up to 0.04 square millimeters and a short side of at least 20 micrometers;
• said functional dots including:
• a first group of said functional dots, having a first composition and having a first, photochromic functionality;
• a second group of said functional dots, having a second composition and having a second functionality, said second functionality selected from the group consisting of an anti-scratch functionality and ultraviolet (UV) absorber functionality;
• wherein said second composition differs with respect to said first composition;
• wherein, within at least one area of said multi-functional areas, said first group has a characteristic height H1, said second group has a characteristic height H2, said characteristic heights satisfying a relationship:
• H2>k*H1,
• k being at least 1.05;
• wherein said height H2 exceeds said height H1 by at least 1 μm;
• and wherein said optical substrate is a curved optical substrate, and said broad surface is a curved broad surface.