OPT204 - Eyeglass Fabrication Lab I

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Last revision date Jan 31, 2022 12:00:25 AM
Last review date Feb 9, 2022 2:17:35 PM

Subject Title
Eyeglass Fabrication Lab I

Subject Description
This subject is designed to give students the opportunity to apply the theory of finishing single vision spectacles in a laboratory setting. Students learn procedures for the safe operation of lens edging equipment and blocking devices, use of the lensometer and clock gauge and the final verification of the lab order. Emphasis is placed on accuracy and industry tolerances.

Credit Status
One credit toward the Opticianry Diploma Program.

Learning Outcomes
Upon successful completion of this subject the student will be able to:

Upon successful completion of this subject the student will be able to:

  •  Recognize WHMIS purpose as an organization developed to standardize hazard  information to ensure safe handling of                chemicals prevent injury or manage accident situations.
  •  Discuss the responsibilities of a supplier, employer and employees as defined by  WHMIS.
  •   Identify the ways in which information on hazardous material is provided to workers.
  •   Recognize WHMIS hazard symbols to manage risks associated with handling and storing laboratory chemicals.
  •   Discuss the hazardous risk of all materials and liquids in the eyeglass. dispensing/fabrication lab and protocols to assure lab   safe environment.
  •   Discuss the safety and infection control requirements as stated in COO Standard 4: Safety and Infection Control in the practice environment.
  •   Discuss the ?Principles of Asepsis? and? Conventions for performing a medical hand wash?.

2.   Describe the process of surfacing lenses and finishing eyeglasses.    

  •   Define semi-finished and finished lenses
  •   Discuss the basic lens surfacing process.
  •   Distinguish between semi-finished and finished lenses processing sequences.
  •   Discuss the instruments and the equipment used in the process of making eyeglasses.
  •   Discuss equipment and instrumentation care and maintenance.

 3. Select the appropriate lenses, optical tools and equipment to edge single vision eyeglasses

  • Select eyeglass lenses according to work order (power, base curve, material, index of  refraction, coatings, tints, e.t.).
  • Determine the eyeglass lens size to assure best cosmetic and optical results.
  • Calculate lens minimum blank size requirements for single vision prescriptions.
  • Select a stock lens or a surfaced lens based on lab order requirements

4. Measure the power and mark the optical center of single vision lenses using the lensometer
  • Measure single vision lenses powers using the manual and the automated lensometer

5. Operate a lens edger to cut single vision lenses into an eyeglass frame
  • Discuss different methods of lens blocking.
  •  Discuss lens blocks designs based of the material they are made of and use.      
  •   Identify edger parts and indicate their functions.       
  •   Prepare lenses for edging, layout and block lenses.
  •   Discuss the edging process.
  •   Discuss edging particularities
  •   Practice edging single vision lenses in full metal and plastic frames

6. Compare eyeglasses parameters and measurements with work order and against ANSI Standards and package for delivery.       


  •     Verify that that the eyeglass frame and lenses information matches the work order.
  •     Inspect visually the lenses for material defects (chips, scratches, defective, wrong or missing lens treatments) and                         edging errors (wrong bevel).
  •      Insert edged lenses into a variety of frame designs.
  •       Position eyeglasses in standard alignment.
  •       Clean lenses including using the ultrasonic cleaner.
  •       Verify lens power and accuracy of measurements compared to eyeglass order and against ANSI standards.
  •       Package and prepare eyeglasses for delivery.
  •       Perform frame adjustments and repairs when necessary.     

7.Perform lens mounting and repairs on nylon cord and rimless frames


  • Discuss wearer safety issues for grooved and rimless frames.
  • Discuss lens grooving methods including using lens edger or a lens groover.
  • Discuss groove position based on lens edge thickness
  •  Mount/install a grooved lens into a frame:
  •  Re-insert/Re-tighten a loose lens on a nylon cord frame.



Essential Employability Skills

    •  Communicate clearly, concisely and correctly in the written, spoken and visual form that fulfils the purpose and meets the needs of the audience.

    •  Respond to written, spoken, or visual messages in a manner that ensures effective communication.

    •  Execute mathematical operations accurately.

    •  Apply a systematic approach to solve problems.

    •  Use a variety of thinking skills to anticipate and solve problems.

    •  Locate, select, organize, and document information using appropriate technology and information systems.

    •  Analyze, evaluate, and apply relevant information from a variety of sources.

    •  Show respect for diverse opinions, values, belief systems, and contributions of others.

    •  Interact with others in groups or teams in ways that contribute to effective working relationships and the achievement of goals.

    •  Manage the use of time and other resources to complete projects.

    •  Take responsibility for one's own actions, decisions, and consequences.

Academic Integrity
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Please visit the Academic Integrity website http://open2.senecac.on.ca/sites/academic-integrity/for-students to understand and learn more about how to prepare and submit work so that it supports academic integrity, and to avoid academic misconduct.

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Accommodation for Students with Disabilities
The College will provide reasonable accommodation to students with disabilities in order to promote academic success. If you require accommodation, contact the Counselling and Accessibility Services Office at ext. 22900 to initiate the process for documenting, assessing and implementing your individual accommodation needs.