Essential knowledge The candidate must be able to demonstrate essential knowledge required to effectively do the task outlined in elements and performance criteria of this unit, manage the task and manage contingencies in the context of the identified work role This includes knowledge of: Drilled rimless frames including mounts and rimless types and equipment needed Relevant Australian standards Filter and tinted lens processes including: Australian standards plastic lens tinting including dyes and tint types, equipment, preparation, problems and solutions transmission testing including equipment and instrumentation, equipment limitations and Australian standards Frame measurement systems including boxing and datum Glazing techniques Impact resistant safety lenses including: advantages and disadvantages Australian standards for both general purpose and industrial use evaluation of materials including glass, CR39, higher index plastics, polycarbonate and laminates impact resistance impact testing requirements, conditions and procedures principles and processing of thermal and chemical toughening problems and special lens requirements Scope of metal and plastic frame material including heating, manipulation, adjusting, handling and repair Standard nylon rims including the equipment needed The properties of lens The use of impact resistant protective lenses Vacuum coatings including: absorptive (tinted) coatings handling, cleaning and care of coatings manufacturing processes multiple layer AR coatings single AR coating surface reflections and ghost images |