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Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

Elements and Performance Criteria

  1. Elements define the essential outcomes
  2. Prepare for edging and fitting
  3. Perform edging and fitting
  4. Adjust and repair frames and lenses
  5. Utilise computer technology
  6. Conduct final checking procedures against Australian standards

Performance Evidence

The candidate must show evidence of the ability to complete tasks outlined in elements and performance criteria of this unit, manage tasks and manage contingencies in the context of the job role. There must be evidence that the candidate has:

edged and fitted at least 10 pairs of spectacles to Australian standards, demonstrating the appropriate handling of the following types of frames and materials:

nylon (nyl-tag) rimless

metal full rim

plastic full rim

automatically edged lenses using:

former cutting

blocking/chucking systems

machine operation

drilling

grooving

hand edged lenses using:

hand bevelling techniques

safety chamfering

changeovers

addressed common lens problems:

rectifying off-axis lenses

reducing unwanted vertical and/or horizontal prism

repaired and modified spectacle frames, including:

alignment

refitting nylon

re-pinning and riveting joints

sink joints

soldering metal frames

undertaking frame part replacements

undertake digital fame tracing

used the features of a manual focimeter for the following tasks:

correct neutralisation

determination of additions

determination of axes

determination of centration

determination of powers

determination of prism

accurately calculated minimum size uncut (MSU) using centration chart and by calculation to allow for papillary distance (PD) and decentration for prism

made templates and eliminated errors using:

hand techniques

machine techniques

tinted lenses to match tint samples

mounted lenses


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 tolerances

transmission and absorption data and its role in edging and fitting

properties of lenses, including:

refractive index

abbe value

specific gravity

impact resistance

transmission and absorption

features and use of impact resistant safety lenses including:

advantages and disadvantages

Australian standards for both general purpose and industrial use

evaluation of materials including glass, CR-39 (allyl diglycol carbonate), trivex, higher index plastics, polycarbonate and laminates

impact resistance

impact testing requirements, conditions and procedures

principles and processing of chemical toughening

problems and special lens requirements

filter and tinted lens processes including:

Australian standards requirements

plastic lens tinting including dyes and tint types, equipment, preparation, problems and solutions

transmission testing including equipment and instrumentation, equipment limitations and Australian standards

vacuum coatings and their use, including:

absorptive (tinted) coatings

handling, cleaning and care of coatings

manufacturing processes

multiple layer antireflection (AR) coatings

single AR coating

the effects of surface reflections and ghost images on lenses

edging and fitting glazing techniques

frame measurement systems including boxing and datum

features of different frames and rims and how to work with them:

different frame materials and their scope of use

techniques for working with frames and rims heating, manipulation, adjusting, handling and repair

rimless types

drilled rimless frames

standard nylon rims

nasal cut and nasal add techniques

features and functions of edging and fitting equipment:

automatic edgers

calibration and checking tools

focimeters (lensmeters)

frame alignment tools

hand edging equipment

marking/centration devices

edging wheel designs and characteristics

machine designs

current and emerging software applications used in the optical dispensing environment