Edge sealant application for optical devices

An apparatus for applying an edge sealant to an eyepiece, the apparatus comprising:

• a chuck that secures the eyepiece to rotate with the chuck while the chuck rotates, the eyepiece comprising multiple optics layers;
• a perimeter measurement component including:
• a bearing mechanism comprising a bearing and a spring that allows the bearing to move in a transverse direction while the bearing is rotating, and that causes the bearing to maintain contact with an edge of the eyepiece while the eyepiece is rotating during a first operational phase to generate a perimeter measurement of a perimeter of the eyepiece;
• and
• a recording component that generates and stores the perimeter measurement of the perimeter of the eyepiece during the first operational phase, the perimeter measurement being based on detected movement of the bearing in the transverse direction while the bearing is rotating and in contact with the edge of the eyepiece while the eyepiece is rotating;
• a sealant applicator that applies the edge sealant to the edge of the eyepiece according to the perimeter measurement while the eyepiece is rotating, during a second operational phase, wherein the sealant applicator applies the edge sealant to the multiple optics layers of the eyepiece during a single sealant application operation;
• and
• a curing component that cures the edge sealant during a third operational phase.