OPT106 - Eyeglass Dispensing Lab - Lens Verification

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Last revision date Jan 31, 2022 12:00:45 AM
Last review date Feb 9, 2022 2:17:28 PM

Subject Title
Eyeglass Dispensing Lab - Lens Verification

Subject Description
This subject prepares students for work in an optical dispensary. Content includes identifying
single vision lenses based on lens materials and add-ons, measuring lens parameters and
verifying that the single vision eyeglasses meet dispensing industry standards. Measuring
accurately single vision lens parameters using the proper instrumentation is emphasized
throughout this subject.

Credit Status
One credit toward the Opticianry Diploma.

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:

1. Apply protocols for hazards and infection control to ensure a safe lab environment.

1.1 Discuss protocols for hazards control.
1.2 Discuss the protocols for infection control.
1.3 Use of adequate hand washing techniques.
1.4 Use adequate protocols for disinfecting of work spaces, instruments, tools, frames and

2. Identify lens materials, designs and treatments and determine the appropriate use for each.
2.1 Exemplify various lens materials including CR-39, crown glass, polycarbonate and hiindex.
2.2 Exemplify various lens designs including spherical, aspherical and atoric.
2.3 Exemplify various types of lens treatments.
2.4 Visually inspect lenses for surface defects.
2.5 Specifies the lens type, material, coating and finishing on a lens order.

3. Use the lens gauge and the lens caliper to measure eyeglass lenses curves and thickness
3.1 Measure lens curves and thickness.
3.2 Measure lenses front and back curves and estimate the total power of the lens.
3.3 Measure lenses center and edge thicknesses.
3.4 Indicate when it is necessary to record base curves on a lens order form.

4. Operate the lensometer to measure the power of uncut lenses.
4.1 Identify the lensometer parts and their functions.
4.2 Verify the calibration of the lensometer.
4.3 Operate the manual and the automated lensometer to neutralize single-vision lenses.
4.4 Mark the optical center of the uncut lenses.

5. Measure with the lensometer the power mounted single vision lenses with and without
prescribed prism.
5.1 Neutralize single vision eyeglass lenses with the manual and auto-mated lensometer
5.2 Determine horizontal and vertical optical center placement.
5.3 Check lenses for the presence of prisms.
5.4 Verify eyeglasses in accordance with ANSI tolerances.
5.5 Interpret findings and record them on a lab work order.

6. Practice procedures for final inspection of single vision eyeglasses based on the ANSI
tolerance chart.
6.1 Performs frame Standard Alignment protocols.
6.2 Measure/Neutralize single vision lenses.
6.3 Distinguish between the lens parameters received from the lab and the ANSI
tolerances and determine the parameters who meet or do not meet the ANSI standard.
6.4 Choose if the eyeglass meet or fail the ANSI standards.

7. Prepare single vision eyeglasses for final inspection and delivery.
7.1 Perform final eyeglass inspection.
7.2 Prepare the eyeglasses for delivery.

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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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