Lens having functional dots of different heights

An optical device comprising:

• (a) a lens;
• (b) at least one multi-functional layer, fixedly attached to a broad optical surface of said lens;
• 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 functionality, said first functionality selected from the group consisting of an anti-reflectance functionality, anti-scratch functionality;
• anti-fog functionality;
• ultraviolet (UV) absorber functionality;
• and 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-reflectance functionality, anti-scratch functionality;
• anti-fog functionality;
• ultraviolet (UV) absorber functionality;
• and photochromic functionality, said second group of said functional dots fulfilling at least one of the following structural properties:
• said second functionality differs with respect to said first functionality;
• and
• 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.