List the assessment methods to be used and the context and resources required for assessment. Copy and paste the relevant sections from the evidence guide below and then re-write these in plain English.
ELEMENT | PERFORMANCE CRITERIA |
Elements define the essential outcomes | Performance criteria describe the performance needed to demonstrate achievement of the element. |
1. Prepare for edging and fitting | 1.1 Access and correctly interpret required information and prescriptions 1.2 Prepare and check equipment and instruments for operational readiness 1.3 Select and prepare personal protective equipment as required |
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2. Perform edging and fitting | 2.1 Edge lenses following the tolerances allowed by Australian standards 2.2 Produce accurate formers 2.3 Use special hand-edging techniques to modify lenses for change-overs and centring corrections 2.4 Edge, drill, groove and mount spectacle lenses to frames 2.5 Edge, drill and mount spectacle lenses to rimless frames |
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3. Adjust and repair frames and lenses | 3.1 Repair and modify spectacle frames to meet client needs 3.2 Complete standard alignment of frames to required standards 3.3 Produce tinted lenses to required standards |
4. Utilise computer technology | 4.1 Select appropriate technology andsoftware applications to achieve the requirements of the task 4.2 Adjust workspace, furniture and equipment to suit the ergonomic requirements of the user 4.3 Use technology according to organisation requirements and in a way which promotes a safe work environment 4.4 Carry out or arrange routine maintenance in order to ensure that equipment is maintained in accordance with manufacturer’s instructions and organisation requirements 4.5 Identify equipment faults and take action in accordance with manufacturer’s instructions or by reporting fault to designated person |
5. Conduct final checking procedures against Australian standards | 5.1 Determine any axis or centring error and apply Australian standards tolerances. 5.2 Verify powers, axes and centration by checking the spectacles on the focimeter 5.3 Check lens surface for scratching and aberrations 5.4 Adjust the frame to standard alignment 5.5 Check metal framed spectacles for strain and reduce as required 5.6 Clean spectacles using appropriate cleaners 5.7 Clean, maintain and store equipment in accordance with manufacturers requirements and infection control procedures 5.8 Accurately document procedures undertaken according to organisation procedure |
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
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