OPT107 - Eyeglass Dispensing Theory I

Outline information
Semester
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Last revision date 2024-01-29 00:37:57.734
Last review date 2024-02-05 00:15:00.19

Subject Title
Eyeglass Dispensing Theory I

Subject Description

This subject introduces students to the requirements of single vision eyeglass dispensing. Students will
learn about frames and single vision lens design, materials and methods of manufacturing. Emphasis is
placed on measuring techniques and lens parameters verification to assure that the eyeglasses meet the
industry standards for safe dispensing. Students will learn the implications of prismatic effect in
ophthalmic lenses and how to calculate the total prismatic effect. Patient assessment, frame and lens
selection and delivery of finished single vision spectacles including patient teaching are included

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:

1. Discuss ophthalmic frames in terms of material, construction, measurement system and specific dispensing procedures.
1.1 Classify various types frames based on design and construction.
1.2 Describe the various bridge designs that are used in metal and plastic frames.
1.3 Indicate the design and name the parts of a temple.
1.4 Find markings on metal and plastic frames.
1.5 Discuss eyeglass frames characteristics based on the materials they are made from.
1.6 Indicate the major reference points and measurements in the boxing system for measuring lenses.
1.7 Indicate the major reference points in the datum system for measuring lenses
1.8 Choose the appropriate frame styles based on the theory of cosmesis.
1.9 Exemplify frame fitting with consideration given to facial features.
1.10 Describe rules and regulations for protective eyewear (according to ANSI, CSA and ASTM).
1.11 Discuss frame standard alignment protocols and frame alignment on patient face.
1.12 Describe tools used in frame adjustments

2. Compare ophthalmic lens characteristics to ensure optimum selection of lenses and frames.
2.1 State the history of lens development.
2.2 State the ingredients and chemicals used in the construction of crown glass.
2.3 Describe the lens surfacing processes.
2.4 Distinguish between conventional and digital surfacing.
2.5 Define single vision lenses.
2.6 Distinguish lens materials in terms of refractive index, thickness, Abbe value and their dispensing applications:
2.7 Distinguish between spherical, aspherical and atoric lens design in terms of construction.
2.8 Describe commonly used scratch resistant coatings.
2.9 Discuss the implications of chromatic aberration on visual performance.
2.10 Identify the following monochromatic aberrations and suggest solutions.
2.11 Describe anti-reflection coating process.
2.12 Describe methods used to dye plastic lenses.
2.13 Distinguish between protection from UV and IR radiation.
2.14 Describe methods of treating glass and plastic lenses to achieve color and UV filtration.
2.15 State the merits of dispensing various colors of tinted lenses.
2.16 Describe glass and plastic photochromic lenses.
2.17 Describe absorptive lenses and their dispensing applications.
2.18 State lens treatments that control glare, filter blue light and improve contrast sensitivity.
2.19 Discuss the elements of optical prescriptions and the requirements of a valid Rx

3. Determine single vision lens parameters using instrumentations and through calculations.
3.1 Describe the parts of the lensometer and their function.
3.2 Indicate procedures used to measure single vision lens powers with the lensometer.
3.3 Describe the parts and function of the lens gauge.
3.4 Discuss sagittal depth and the principle of the lens gauge.
3.5 Indicate procedures for measuring front and back curves of single vision lenses.
3.6 Calculate lens surface power and lens nominal power.
3.7 Discuss base curves in terms of best corrected curves.
3.8 Define lens blanks and use formula to calculate lens minimum blank size required for single vision prescriptions.
3.9 Recognize the implications of correct base curve selection.
3.10 Describe the parts and functions of the thickness caliper.
3.11 Indicate the procedure of measuring lens center and edge thickness
4. Demonstrate the effect of prisms on single vision eyeglasses and calculate the total prismatic effect.
4.1 Discuss prism properties of lenses.
4.2 Discuss the effects of ophthalmic prism on vision.
4.3 Calculate prism power using Prentice’s Rule.
4.4 Determine the overall prismatic effect in eyeglasses.
4.5 Calculate decentration to produce a specific amount of prism.
4.6 Discuss the horizontal prismatic effect in a pair of eyeglasses, calculate error and determine if conforms to ANSI standards.
4.7 Calculate the vertical imbalance in a pair of single vision eyeglasses.

5. Explain the accepted dispensing procedures for fitting single vision eyewear.
5.1 Describe the procedures for fitting single vision eyeglasses.
5.2 Discuss proper positioning of the frame on patient face before taking measurements.
5.3 State the implications of correct O.C. placement.
5.4 Define binocular and monocular inter-pupillary distance.
5.5 Describe instrumentation used in taking inter-pupillary distance measurements for single vision eyeglasses.
5.6 Describe the tools/instruments used in fitting frames and lenses.
5.7 Describe digital tools used in fitting frames and lenses.
5.8 Describe alternative methods for taking measurements.
5.9 Discuss the effect of optical center measurement and monocular pupillary distance measurements on fusion in anisometropic patients.
5.10 Based on a given prescription and anatomical measurements, indicate suitable lenses and frames for a patient.
5.11 Describe the accepted procedure for ordering lenses based on a patient’s existing lenses.
5.12 State the implications of ordering lenses based on a patient’s existing eyeglasses

6. Explain the procedures for ordering and verifying single vision lenses to ensure consistency with ANSI standard.
6.1 Discuss the industry standards of tolerance (ANSI).
6.2 Distinguish lens parameters from a lab order from the parameters of the finished lenses and determine if they meet the ANSI lens tolerances.
6.3 Describe the protocol for delivering the finished eyeglasses to the patient

7. Based on case studies, discuss the principles of dispensing single vision eyeglasses, considering prescribed lens power and patient’s needs.
7.1 Describe options for eyewear based on the patient’s lifestyle.
7.2 Indicate appropriate eyewear options for specific purposes including sunglasses and computer use.
7.3 Identify suitable lenses and frames for a patient based on a given prescription and anatomical measurements.
7.4 Describe lens designs that are appropriate for distance, intermediate and near vision needs.
7.5 Determine if the lens parameters from a lab order and the parameters of the finished lenses meet the ANSI lens tolerance chart.
7.6 Exemplify reasons to troubleshoot patient complaints.

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