RGP Lens Insertion and Removal
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Questions and Answers

What is the recommended technique to control lid margins during RGP lens removal?

  • Sclera-to-cornea push
  • V method
  • Pinch method (correct)
  • Pull and blink

    • When inserting an RGP lens, what is the recommended placement location?

  • Pupil
  • Iris
  • Sclera
  • Cornea (correct)

    • What is the purpose of assessing the RGP lens movement during blinking?

  • To measure lens oxygen permeability
  • To check for lens damage
  • To assess lens comfort
  • To evaluate tear exchange (correct)

    • What is the recommended technique to help a patient who is screwing up their eyes during RGP lens insertion or removal?

    <p>Ask the patient to open their mouth as wide as possible</p> Signup and view all the answers

    What is the ideal amount of vertical lens movement during blinking?

    <p>1-1.5mm</p> Signup and view all the answers

    What is the primary purpose of assessing RGP lens centration?

    <p>To determine lens position and movement</p> Signup and view all the answers

    What is the term for the RGP lens riding high or low on the cornea?

    <p>Riding high or low</p> Signup and view all the answers

    Why may the RGP lens move excessively during initial fitting?

    <p>Due to reflex tearing</p> Signup and view all the answers

    What is the purpose of assessing RGP lens movement during versions and upgaze?

    <p>To determine lag and sag</p> Signup and view all the answers

    What is the recommended guidance for RGP lens insertion and removal?

    <p>College WT guidance</p> Signup and view all the answers

    What happens to the centre of gravity in a Riding High minus lens?

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

    What is the effect of increasing the BOZD on the fit of a lens?

    <p>It steepens the fit</p> Signup and view all the answers

    What is the purpose of using a Wratten filter with Fluorescein?

    <p>To block UV light</p> Signup and view all the answers

    What is the effect of reducing the BOZR on the tear film power?

    <p>It increases the tear film power</p> Signup and view all the answers

    What is the ideal edge clearance in a well-fitting lens?

    <p>0.75mm</p> Signup and view all the answers

    What is the effect of increasing the Td on the fit of a lens?

    <p>It flattens the fit</p> Signup and view all the answers

    What is the purpose of using Fluorescein in fitting a lens?

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

    What is the effect of a Steep lens on the centre of gravity?

    <p>It moves the centre of gravity further forward</p> Signup and view all the answers

    What is the purpose of assessing the BOZD and BOZR in fitting a lens?

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

    What is the effect of using a low-riding lens on the lid interaction?

    <p>It decreases lid interaction</p> Signup and view all the answers

    What is the primary purpose of assessing the dynamic fit of an RGP lens?

    <p>To evaluate the lens's movement during blinking</p> Signup and view all the answers

    What is the recommended technique to remove an RGP lens when the 'pinch' method is not effective?

    <p>Use the 'V' method</p> Signup and view all the answers

    What is the significance of lateral movement in an RGP lens during blinking?

    <p>It suggests a flat or oblique cylinder</p> Signup and view all the answers

    What is the purpose of assessing the RGP lens's movement on versions and upgaze?

    <p>To evaluate the lens's lag and sag</p> Signup and view all the answers

    What is the recommended method to ensure proper placement of an RGP lens during insertion?

    <p>Place the lens directly on the cornea</p> Signup and view all the answers

    What is the purpose of assessing the RGP lens's static fit?

    <p>To assess the lens's relationship with the cornea</p> Signup and view all the answers

    What is the significance of reflex tearing in an RGP lens during initial fitting?

    <p>It causes excessive lens movement</p> Signup and view all the answers

    What is the recommended technique to control lid margins during RGP lens removal?

    <p>Use the 'pinch' method</p> Signup and view all the answers

    What is the purpose of assessing the RGP lens's centration?

    <p>To assess the lens's relationship with the cornea</p> Signup and view all the answers

    What is the significance of a well-centred RGP lens?

    <p>It enhances the lens's tear exchange</p> Signup and view all the answers

    What is the effect on the centre of gravity in a Riding Low High plus lens?

    <p>Centre of gravity moves further forward</p> Signup and view all the answers

    What is the purpose of using buffered saline to wet the Fluorescein strip?

    <p>To maintain the pH level of the strip</p> Signup and view all the answers

    What is the effect of increasing the BOZD on the fit of a lens?

    <p>It flattens the fit of the lens</p> Signup and view all the answers

    What is the recommended approach to assess the centration of the lens?

    <p>Compare the inner and outer optic zone regions</p> Signup and view all the answers

    What is the effect of reducing the BOZR by 0.05mm?

    <p>The tear film power increases by +0.25D</p> Signup and view all the answers

    What is the purpose of using a diffuser when using Fluorescein?

    <p>To enhance the fluorescence effect</p> Signup and view all the answers

    What is the effect of a Steep lens on the edge clearance?

    <p>It decreases the edge clearance</p> Signup and view all the answers

    What is the recommended approach to achieve a smooth transition for tear exchange?

    <p>Achieve a smooth transition at the edge</p> Signup and view all the answers

    What is the effect of increasing the Td on the fit of a lens?

    <p>It steepens the fit of the lens</p> Signup and view all the answers

    What is the purpose of using a Wratten filter with Fluorescein?

    <p>To block UV light from the Burton lamp</p> Signup and view all the answers

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