Presentation on theme: "Technician role in fitting lenses"— Presentation transcript:
1 Technician role in fitting lenses Contact lenses Week 1Technician role in fitting lenses
2 Contact lensA 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 interviewOcular examMaterial lens selectionTrail lens examinationTeaching lens care,lens insertion and removal
4 Technician role in lens fitting Patient interviewPatient health and history- ocular and systemicOccupationHobbiesPrevious eye care and/or correctionWhat do they hope to achieveMotivationWhat can they afford/ insuranceAge vs. understanding the care and safety
5 Technician role in lens fitting Ocular examVA with and without correctionRefraction, distance and near (with cycloplegic)KeratometryTenometryColor vision testVisual field, if indicatedCorneal, pupil, and iris measurement, before dilationPupil size and reactivityTear and blink functionBlink rate and lid tension
6 Technician role in lens fitting Lens material selectionSoft contacts lensa. spherical vs. toric ( sphericocylindrical) correctionb. single vision vs. multifocalc. base curve, diameter, powerd. manufacturerGas Permeablea. single vision vs. multifocalb. base curve, diameter, power and lens material
7 Technician role in lens fitting Trial lens fittingComfortVisual acuityOver refraction (if VA is not 20/20)Verification of fit ( under slit lamp exam)Make modifications, if necessary
8 Technician role in lens fitting EducationTeaching care and handling of lensesTeaching insertionTeaching 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.
11 Technician role in lens fitting KeratometryHave 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 goneAdjust horizontal +’s until they are overlapping.Adjust vertical –’s until they are overlappingRecord.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 180b. OD 42.00x 90/44x 180 OS 42.50x 90/43.50x 180Record the condition of the mires, i.e.…clear and regular or distorted and blurry.
13 Technician role in lens fitting With vs. againstFlattest Keratometry reading 39.00Steepest Keratometry reading 47.00Lower is flatHigher is steep
14 Technician role in lens fitting Types of astigmatismWith-the-ruleIn with the rule corneal astigmatism the horizontal meridian is the flattest and the vertical meridian is the steepest.42.00x 180/44.00x 90Against-the-rulein 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.