OPT401 - Contact Lens Theory II

Outline info
Last revision date 2017-05-29 00:26:02.409
Last review date 2017-07-17 00:15:00.624

Subject Title
Contact Lens Theory II

Subject Description

This subject builds on the basic theory related to optics and contact lens practice. Emphasis is placed on understanding rigid lenses, special lenses and advanced fitting techniques.

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. Compare and contrast specific soft and rigid contact lens designs. 2. Demonstrate knowledge of the principles and procedures for fitting toric soft

and rigid gas permeable contact lenses.


3. Demonstrate knowledge of the principles and procedures for fitting the

presbyopic patient.


4. Outline concepts and critical elements related to fitting specialty contact

lenses. 5. Analyze ocular complications which will affect or be induced by the use of

contact lenses and select the appropriate course of action.


6. From a presentation of slides identify contact lens complications, stain

patterns, various lens designs and contact lens fitting status. 7. Perform calculations to derive lens power and tear power based on

keratometric measurements, prescription and manifest over refraction. 8. Given a series of case scenarios, name the ocular condition and identify the

associated contact lens problems.

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.

Cheating and Plagiarism
Each student should be aware of the College's policy regarding Cheating and Plagiarism. Seneca's Academic Policy will be strictly enforced.

To support academic honesty at Seneca College, all work submitted by students may be reviewed for authenticity and originality, utilizing software tools and third party services. Please visit the Academic Honesty site on http://library.senecacollege.ca for further information regarding cheating and plagiarism policies and procedures.

All students and employees have the right to study and work in an environment that is free from discrimination and/or harassment. Language or activities that defeat this objective violate the College Policy on Discrimination/Harassment and shall not be tolerated. Information and assistance are available from the Student Conduct Office at student.conduct@senecacollege.ca.

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 Disabilities Services Office at ext. 22900 to initiate the process for documenting, assessing and implementing your individual accommodation needs.

OPT303 and OPT304

OPT402 and OPT450

Topic Outline

  • Lens designs
  • Interpretation of the prescription for appropriate lens selection
  • Soft toric lens design and fitting
  • Gas Permeable lenses
  • Gas Permeable lenses  - fitting techniques
  • Adaptive symptoms
  • Front, back, bitoric lens designs
  • Modification of RGP lenses
  • Pediatric fitting  
  • Presbyopic fitting
  • Problem solving, case studies
  • Aphakic fitting
  • Keratoconus fitting
  • Bandage/Therapeutic Lenses

Mode of Instruction
- classroom lecture & audio visual, assignments

Prescribed Texts

1. Contact Lens Practice

2nd ED, Efron;



ISBN 0750688696


2. Contact Lens Complications

 2nd ED Efron:




Reference Material
3. Dictionary of the Eye Terminology
5th ED, Cassin, Solomon:
Triad Publishing
ISBN 0937404683

Promotion Policy

Grading Policy
A+ 90%  to  100%
A 80%  to  89%
B+ 75%  to  79%
B 70%  to  74%
C+ 65%  to  69%
C 60%  to  64%
D+ 55%  to  59%
D 50%  to  54%
F 0%    to  49% (Not a Pass)
EXC Excellent
SAT Satisfactory
UNSAT Unsatisfactory

For further information, see a copy of the Academic Policy, available online (http://www.senecacollege.ca/academic-policy) or at Seneca's Registrar's Offices.

Modes of Evaluation
Promotion Policy:  In Seneca college Health Sciences programs, a minimum grade of "C" (60%) is required for promotion.

Test 10%
Slide Test 10%
Class Presentations 10%
MidTerm 30%
Final Exam 40%
Total 100%

Students must score a minimum grade of  "C" (60%) in the final examination in order to pass this subject.
Test and mid-term exam dates have been pre arranged and are non-negotiable.  If a test is missed the student MUST provide the reason IN WRITING to
the teacher within 7 days following the date of the test.  If acceptable the weighting from the test will be added to the final examination; otherwise a zero grade
will be the result. Students are required to hand in assignments at the beginning of class on the specified due date. Given the possibility of unforeseen problems,
we advise students to begin assignments early. Should extenuating circumstances arise, students are advised to contact the instructor immediately before the
assignment is due, so an appropriate plan can be established. Late assignments may be subject to a penalty of up to 10% per week and, generally, will not be
accepted beyond two weeks after the assignment due date.
Cheating and Plagiarism
Using another's ideas as one's own, as well as copying directly from the internet, books, magazines and other sources without acknowledgement is plagiarism.
Cheating and plagiarism constitute unacceptable behaviour.  Such offenses occur when a student violates the procedures governing the administration of examinations,
tests or other means of evaluating student achievement in a subject.

A promotion meeting will be convened to review alleged instances of cheating or plagiarism.

The minimum penalty for a first offense will be loss of credit of the evaluation involved.  A second offense may result in the immediate expulsion from the
College for the remainder of the current academic semester and two subsequent academic semesters.

Where there is sufficient evidence to assess a penalty, all relevant information will be maintained in the student's file.  The student has the right to appeal the
decision of the College, consistent with academic policy.

Approved by: Lisa Somers