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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. Evaluate client needs
   • Interpret the parameters of atypical prescriptions and transpose as required
   • Analyse the prescription and identify areas of freedom and constraints
   • Assess the individual needs and requirements of the client
   • Select possible frame, lens and treatment combinations to suit individual requirements based on principles of low vision aid selection, depending on client’s needs
3. Determine specifications for atypical prescriptions
   • Take accurate measurements and make calculations necessary to accurately dispense atypical prescriptions
   • Select option that best meets cosmetic, optical and functional needs
   • Determine the correct working distance for low vision aids
4. Fit frames and lenses for atypical prescriptions
   • Organise required fitting equipment and materials
   • Select and specify appropriate bevelling and edging requirements to enhance the cosmetics and quality of the spectacles
   • Select appropriate lens treatments or additional requirements to maximise the visual performance and enhance the quality of the finished spectacles
   • Measure and specify the most appropriate lens fitting criteria
   • Ensure the quality of the finished spectacles
   • Fit and adjust the spectacles to client needs
5. Instruct client on wear and care
   • Provide client with details about how to wear the appliance
   • Offer information about appliance care routines
   • Reinforce and support advice provided by low vision practitioner on correct use of low-vision aids
6. Finalise dispensing process
   • Complete financial transactions in accordance with relevant policies and procedures
   • Follow correct procedures for client rebates
   • Complete and store records in accordance with relevant policies, procedures and confidentiality requirements
   • Offer follow up services in accordance with organisation procedures

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:

dispensed optical appliances in response to at least 5 different atypical prescription needs

determined the criteria for atypical dispensing, including making accurate calculations for the following:

change in vertex distance

compensated power (Fc)

effective power (Fe)

effectivity

prescriptions requiring compensations

calculated differential prismatic effect and compensation using different sized segments, Fresnel prisms, or slab off bifocals

calculated field of view and determine ways to improve the field of view

calculated spectacle magnification and determine ways to reduce the effects of aniseikonia

compounded and resolved prism

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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:

legal and ethical considerations for dispensing optical advice to clients:

duty of care

informed consent

privacy, confidentiality and disclosure

records management

work role boundaries – responsibilities and limitations

work health and safety

requirements of dispensing spectacles to clients with special or complex needs, including:

low vision, what it is, and how various aids may be used to assist such clients

types of atypical prescriptions, how to interpret and transpose them, including:

anisometropia

aphakia

high ametropia

prism

features and capabilities of aphakic lenses including:

aspheric lens design

centering

compensating for vertex distance change

edging/bevelling profile

full field lens design

general problems associated with dispensing aphakic lenses including jack-in-the-box effect and ring scotoma

lenticular designs

field of view and its impact on atypical dispensing, including:

apparent versus real

aspheric lenses

calculations

high minus corrections

high plus corrections

features of high ametropia including:

back vertex power (F’v) front vertex power (Fv)

compensated surface power

corrections

prescription requirements and constraints

thick lens power

types

high minus lenses and negative lenticulars and how they are used, including:

centering

compensating for vertex distance change

dispensing high index materials

edging/bevelling profile

high index materials

lenticular types and designs

surface reflections and the need for anti-reflection and multi-coatings

high prismatic corrections and how they are achieved, including:

edging/bevelling profile

fresnels and their use

high horizontal prism

high vertical prism

ways to respond to aniso and antimetropia including:

base curve selection

correcting vertical imbalance problems

effects of lens form (shape)

effects of thickness

prism differential

features of spectacle magnification including:

effects on visual acuity

positive compared to negative lenses

retinal image size

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