Contact Lens Fitting Assessment
40 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is a characteristic of a bad contact lens fit?

  • Lens movement on blink
  • Stable sagittal depth
  • Immobility and associated inflammation (correct)
  • Comfortable vision

    • Why is the selection of BOZR considered pot-luck?

  • Because it depends on the settling time
  • Because it depends on the material used
  • Because it depends on the diameter of the lens
  • Because it depends on the sagittal depth of the lens (correct)

    • What happens to the lens during the initial 5 minutes of settling?

  • It remains unchanged
  • It becomes looser
  • It settles to its optimal position (correct)
  • It becomes tighter

    • What is the result of natural loss of excess tears during lens fitting?

    <p>A more accurate evaluation of the lens fit</p> Signup and view all the answers

    What is the effect of temperature rise on the lens during settling?

    <p>Slight effect</p> Signup and view all the answers

    What happens if the lens has not settled during evaluation?

    <p>It looks looser than it actually is</p> Signup and view all the answers

    What is the critical dimension of the lens?

    <p>Sagittal depth</p> Signup and view all the answers

    What is the result of a larger lens overlapping onto the sclera?

    <p>Less movement of the lens</p> Signup and view all the answers

    What is the typical movement of the lens on blink?

    <p>0.3-5 mm</p> Signup and view all the answers

    What is the result of vertical lens sag?

    <p>The lens crosses the limbus</p> Signup and view all the answers

    What is the primary purpose of the PUSH-UP test in assessing the fit of a contact lens?

    <p>To measure the force needed to move the lens</p> Signup and view all the answers

    What is the significance of a lens moving 0.25mm – 0.50mm in the Bo Movement scale?

    <p>It is a normal range of movement</p> Signup and view all the answers

    What is the recommended minimum movement of a lens for extended wear?

    <p>0.5mm</p> Signup and view all the answers

    What is the primary advantage of made-to-order lenses?

    <p>They can be altered to fit the patient's needs</p> Signup and view all the answers

    What is the purpose of the Wolffsohn scale in assessing the fit of a contact lens?

    <p>To grade the lens fit using a 3-point scale</p> Signup and view all the answers

    What is the significance of a scleral centration overlap of > 0.5 -1.0mm between nasal and temporal lag?

    <p>It indicates a tight lens fit</p> Signup and view all the answers

    What is the recommended approach to adjusting the fit of a soft contact lens?

    <p>Change the diameter of the lens first</p> Signup and view all the answers

    What is the primary concern with fitting soft torics?

    <p>Ensuring the Cyl axis is accurately corrected</p> Signup and view all the answers

    What is the CAAS/LARS rule used for in fitting soft torics?

    <p>To compensate for lens rotation</p> Signup and view all the answers

    What should you expect to see when inserting a compensated axis in a soft toric lens that has rotated?

    <p>The lens should still appear rotated on the eye</p> Signup and view all the answers

    What is the primary purpose of conducting a slit lamp examination in contact lens fitting?

    <p>To assess the lens fit and visual acuity</p> Signup and view all the answers

    What is the effect of a larger lens diameter on the movement of the lens?

    <p>It decreases the movement of the lens</p> Signup and view all the answers

    What is the significance of the sagittal depth of the lens?

    <p>It is the critical dimension of the lens</p> Signup and view all the answers

    What is the recommended initial settling time for a contact lens?

    <p>5 minutes</p> Signup and view all the answers

    What is the purpose of over-refraction in contact lens fitting?

    <p>To check the spherical power of the lens</p> Signup and view all the answers

    What is the result of an immobile contact lens fit?

    <p>It is associated with inflammation and microbial keratitis</p> Signup and view all the answers

    What is the purpose of the Duochrome assessment in contact lens fitting?

    <p>To check the spherical power of the lens</p> Signup and view all the answers

    What is required to properly evaluate the fit of a contact lens?

    <p>Natural loss of excess tears</p> Signup and view all the answers

    What is the characteristic of a well-fitting contact lens?

    <p>It has a good centration and complete corneal coverage</p> Signup and view all the answers

    What is the purpose of recording the fit of a contact lens?

    <p>To check the centration and corneal coverage of the lens</p> Signup and view all the answers

    What is the primary concern with a soft immobile lens?

    <p>It will cause problems with comfort</p> Signup and view all the answers

    What is the significance of a scleral centration overlap of < 0.5 -1.0mm between nasal and temporal lag?

    <p>The lens is slightly loose</p> Signup and view all the answers

    What is the effect of friction on lens movement?

    <p>It decreases the movement of the lens</p> Signup and view all the answers

    What is the typical approach to adjusting the fit of a soft contact lens?

    <p>Diameter changes are more effective than radius changes</p> Signup and view all the answers

    What is the significance of a lens moving > 0.25 mm – 0.50 mm in the Bo Movement scale?

    <p>The lens is slightly loose</p> Signup and view all the answers

    What is the purpose of assessing the fit of a lens after several hours of wear?

    <p>To determine the optimal fit of the lens</p> Signup and view all the answers

    What is the significance of a keratometer mires stable on blink?

    <p>The lens is optimal</p> Signup and view all the answers

    What is the primary advantage of using a better wetting lens?

    <p>It moves more</p> Signup and view all the answers

    What is the significance of a lens that requires removal in an emergency?

    <p>All of the above</p> Signup and view all the answers

    What is the primary concern with fitting soft torics?

    <p>Nasal rotation</p> Signup and view all the answers

    More Like This

    Roles and Tasks in Contact Lens Fitting
    29 questions

    Roles and Tasks in Contact Lens Fitting

    RobustFourier1674 avatar
    RobustFourier1674
    Contact Lens Suitability Assessment
    80 questions

    Contact Lens Suitability Assessment

    RightfulEnjambment avatar
    RightfulEnjambment
    Contact Lens Handling and Care
    92 questions

    Contact Lens Handling and Care

    FineLookingCerberus avatar
    FineLookingCerberus
    Soft Contact Lens Dynamics and Fitting
    21 questions

    Soft Contact Lens Dynamics and Fitting

    CrediblePrologue6943 avatar
    CrediblePrologue6943
    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser