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Elements and Performance Criteria
Performance Evidence
Knowledge Evidence
The candidate must be able to demonstrate essential knowledge required to effectively complete tasks outlined in elements and performance criteria of this unit, manage tasks and manage contingencies in the context of the work role. This includes knowledge of:
Australian standards tolerancestransmission and absorption data and its role in edging and fittingproperties of lenses, including:refractive indexabbe valuespecific gravityimpact resistancetransmission and absorptionfeatures and use of impact resistant safety lenses including:advantages and disadvantagesAustralian standards for both general purpose and industrial useevaluation of materials including glass, CR-39 (allyl diglycol carbonate), trivex, higher index plastics, polycarbonate and laminatesimpact resistanceimpact testing requirements, conditions and proceduresprinciples and processing of chemical tougheningproblems and special lens requirementsfilter and tinted lens processes including:Australian standards requirementsplastic lens tinting including dyes and tint types, equipment, preparation, problems and solutionstransmission testing including equipment and instrumentation, equipment limitations and Australian standardsvacuum coatings and their use, including:absorptive (tinted) coatingshandling, cleaning and care of coatingsmanufacturing processesmultiple layer antireflection (AR) coatingssingle AR coatingthe effects of surface reflections and ghost images on lenses edging and fitting glazing techniques frame measurement systems including boxing and datumfeatures of different frames and rims and how to work with them:different frame materials and their scope of usetechniques for working with frames and rims heating, manipulation, adjusting, handling and repairrimless typesdrilled rimless frames standard nylon rims nasal cut and nasal add techniques features and functions of edging and fitting equipment:automatic edgerscalibration and checking toolsfocimeters (lensmeters)frame alignment toolshand edging equipmentmarking/centration devices edging wheel designs and characteristicsmachine designscurrent and emerging software applications used in the optical dispensing environment