Technician role in fitting lenses

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Presentation transcript:

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

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

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

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

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

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

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

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

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.

Technician role in lens fitting

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.

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.

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

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

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