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Elements and Performance Criteria

1. Evaluate the needs of clients requiring atypical optical prescriptions
   • Interpret the parameters of atypical prescriptions
   • Analyse the prescription and identify areas of freedom and constraints
   • Assess the individual needs and requirements of the client
   • Select possible frame/lens/treatment combinations to suit the individual client s requirements
2. Determine the criteria influencing dispensing procedures for atypical prescriptions
   • Perform measurements necessary to accurately dispense atypical prescriptions
   • Perform any necessary calculations required to dispense the prescription accurately
   • Evaluate the most appropriate course of action to be taken to meet the cosmetic, optical and functional needs of the atypical client
3. Dispense a range of atypical prescriptions
   • Select appropriate frames to suit a variety of atypical prescriptions
   • Select appropriate lenses to suit the needs of atypical prescriptions
   • 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 for the client ensuring that they are informed of the appropriate way to care for and use their spectacles

Required Skills

This describes the essential skills and knowledge and their level required for this unit

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 Aphakic lenses including aspheric lens design centering compensating for BVD change edgingbevelling treatments full field lens design general problems associated with dispensing aphakic lenses including jackinthebox effect and ring scotoma lenticular designs Field of view including apparent v real aspheric lenses calculations high minus corrections high plus corrections High ametropia including back Vertex Power Fv Front Vertex Power Fv compensated surface power corrections prescription requirements and constraints thick lens power types High minus lenses and negative lenticulars including centering dispensing high index materials edgingbevelling treatments high index materials lenticular types and designs surface reflections and the need for AR and multicoatings High prismatic corrections including edgingbevelling treatments fresnels and their use high horizontal prism high vertical prism continued

Essential knowledge continued Handling aniso and antimetropia including base curve selection correcting vertical imbalance problems effects of lens form shape effects of thickness prism differential Spectacle magnification including effects on visual acuity positive v negative lenses retinal image size

Essential skills It is critical that the candidate demonstrate the ability 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 the ability to Calculate vertex distance and measurements including change in vertex distance compensated power Fc effective power Fe effectivity prescriptions requiring compensations vertex distance measurement techniques Calculate differential prismatic effect and compensation using different sized segments or slab off bifocals Calculate field of view and determine ways to improve the field of view Calculate spectacle magnification and determine ways to reduce the effects of aniseikonia Compound and resolve prism

Evidence Required

The evidence guide provides advice on assessment and must be read in conjunction with the Performance Criteria Required Skills and Knowledge the Range Statement and the Assessment Guidelines for this Training Package
Critical aspects for assessment and evidence required to demonstrate this competency unit	The individual being assessed must provide evidence of specified essential knowledge as well as skills Observation of actual or simulated workplace performance is essential for assessment of this unit Consistency of performance should be demonstrated over the required range of situations relevant to the workplace Where for reasons of safety space or access to equipment and resources assessment takes place away from the workplace the assessment environment should represent workplace conditions as closely as possible
Context of and specific resources for assessment	Resources essential for assessment include Distometer BVD calculator BVD table BVD rule Pupillometer Lens measure Thickness callipers PD rule
Method of assessment	Observation in the work place if possible Written assignmentsprojects or questioning should be used to assess knowledge Case study and scenario as a basis for discussion of issues and strategies to contribute to best practice QuestioningTest
Access and equity considerations	All workers in the health industry should be aware of access and equity issues in relation to their own area of work All workers should develop their ability to work in a culturally diverse environment In recognition of particular health issues facing Aboriginal and Torres Strait Islander communities workers should be aware of cultural historical and current issues impacting on health of Aboriginal and Torres Strait Islander people Assessors and trainers must take into account relevant access and equity issues in particular relating to factors impacting on health of Aboriginal andor Torres Strait Islander clients and communities
Related units	This unit should be undertaken after or in conjunction with unit HLTOPDB Perform workshop skills and place orders HLTOPD407B Perform workshop skills and place orders

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Range Statement

The Range Statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Add any essential operating conditions that may be present with training and assessment depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts.
Prescriptions may include:	High ametropia Anisometropia Prism Aphakia
Equipment may include but is not limited to:	Distometer BVD calculator BVD table BVD rule Pupillometer Lens measure Thickness callipers PD rule

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