A professional who fits and secures multifocal lens parts together preparatory to fusing, utilising adhesive compound or asbestos tape. Responsibilities include:

• Dips multifocal button in cleaning solution and wipes dry.
• Brushes button and countersink blank to remove dust and lint.
• Positions button on polished surface of countersink blank.
• Performs test to detect presence of foreign matter between button and countersink blank, using instrument that indicates foreign matter when pressure is applied to outside edge of button.
• Recleans surfaces and performs test until instrument indicates lens parts are free of foreign matter.
• Places spring clamp on blank to hold button in position.
• Inserts metal peg between button and blank to allow air to escape during fusing, using tweezers.
• Applies cement to surface contact points around edge of button, using needle applicator, or wraps asbestos tape around button and countersink blank assembly to hold button in place.
• Removes spring clip and metal peg after cement is set.
• Places assembled unit in tray for transfer to fusing room.