Contact Lens Fitting Assessment
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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

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