1. Technician role in fitting lenses
Contact lenses Week 1
Technician role in fitting lenses

2. Contact lens
A medical device supported by the lids, cornea, conjunctiva and tear film to correct a patient’s vision.

3. Technician role in fitting CL’s
The technician gathers all pertinent information to see whether or not a specific patient is a good candidate for CL’s and which type of CL is best for them.
Patient interview
Ocular exam
Material lens selection
Trail lens examination
Teaching lens care,lens insertion and removal

4. Technician role in lens fitting
Patient interview
Patient health and history- ocular and systemic
Occupation
Hobbies
Previous eye care and/or correction
What do they hope to achieve
Motivation
What can they afford/ insurance
Age vs. understanding the care and safety

5. Technician role in lens fitting
Ocular exam
VA with and without correction
Refraction, distance and near (with cycloplegic)
Keratometry
Tenometry
Color vision test
Visual field, if indicated
Corneal, pupil, and iris measurement, before dilation
Pupil size and reactivity
Tear and blink function
Blink rate and lid tension

6. Technician role in lens fitting
Lens material selection
Soft contacts lens
a. spherical vs. toric ( sphericocylindrical) correction
b. single vision vs. multifocal
c. base curve, diameter, power
d. manufacturer
Gas Permeable
a. single vision vs. multifocal
b. base curve, diameter, power and lens material

7. Technician role in lens fitting
Trial lens fitting
Comfort
Visual acuity
Over refraction (if VA is not 20/20)
Verification of fit ( under slit lamp exam)
Make modifications, if necessary

8. Technician role in lens fitting
Education
Teaching care and handling of lenses
Teaching insertion
Teaching removal

9. Keratometer/ophthalmometer
To assess curvature and power of the corneal surface. May also be used to assess the integrity of the cornea and tear surface.
Gives the base curve of the corneal meridians.

10. Technician role in lens fitting

11. Technician role in lens fitting
Keratometry
Have patient take off specs.
Focus eyepiece.
Adjust patient in chin rest.
Move keratometer up or down to match hash marks with patient’s outer canthus.
Move keratometer left to right to align with corneal reflection.
Look into scope and align lower right hand circle + in center.
Adjust focusing knob forward or back until double mires are gone
Adjust horizontal +’s until they are overlapping.
Adjust vertical –’s until they are overlapping
Record.
Repeat same procedure for OS.

12. Technician role in lens fitting
Record each eye separately.
Record according to office policy:
a. OD 42.00/44.00 x 180 OS 42.50/43.50x 180
b. OD 42.00x 90/44x 180 OS 42.50x 90/43.50x 180
Record the condition of the mires, i.e.…clear and regular or distorted and blurry.

13. Technician role in lens fitting
With vs. against
Flattest Keratometry reading 39.00
Steepest Keratometry reading 47.00
Lower is flat
Higher is steep

14. Technician role in lens fitting
Types of astigmatism
With-the-rule
In with the rule corneal astigmatism the horizontal meridian is the flattest and the vertical meridian is the steepest.
42.00x 180/44.00x 90
Against-the-rule
in against the rule astigmatism the horizontal meridian is the steepest and the vertical meridian is the flattest.
44.00x 180/ 42.00x 90

15. Let’s go practice keratometry!
See you next week for anatomy lecture.