40 Questions
What is the recommended technique to control lid margins during RGP lens removal?
Pinch method
When inserting an RGP lens, what is the recommended placement location?
Cornea
What is the purpose of assessing the RGP lens movement during blinking?
To evaluate tear exchange
What is the recommended technique to help a patient who is screwing up their eyes during RGP lens insertion or removal?
Ask the patient to open their mouth as wide as possible
What is the ideal amount of vertical lens movement during blinking?
1-1.5mm
What is the primary purpose of assessing RGP lens centration?
To determine lens position and movement
What is the term for the RGP lens riding high or low on the cornea?
Riding high or low
Why may the RGP lens move excessively during initial fitting?
Due to reflex tearing
What is the purpose of assessing RGP lens movement during versions and upgaze?
To determine lag and sag
What is the recommended guidance for RGP lens insertion and removal?
College WT guidance
What happens to the centre of gravity in a Riding High minus lens?
It moves further back
What is the effect of increasing the BOZD on the fit of a lens?
It steepens the fit
What is the purpose of using a Wratten filter with Fluorescein?
To block UV light
What is the effect of reducing the BOZR on the tear film power?
It increases the tear film power
What is the ideal edge clearance in a well-fitting lens?
0.75mm
What is the effect of increasing the Td on the fit of a lens?
It flattens the fit
What is the purpose of using Fluorescein in fitting a lens?
To assess the fit of the lens
What is the effect of a Steep lens on the centre of gravity?
It moves the centre of gravity further forward
What is the purpose of assessing the BOZD and BOZR in fitting a lens?
To assess the fit of the lens
What is the effect of using a low-riding lens on the lid interaction?
It decreases lid interaction
What is the primary purpose of assessing the dynamic fit of an RGP lens?
To evaluate the lens's movement during blinking
What is the recommended technique to remove an RGP lens when the 'pinch' method is not effective?
Use the 'V' method
What is the significance of lateral movement in an RGP lens during blinking?
It suggests a flat or oblique cylinder
What is the purpose of assessing the RGP lens's movement on versions and upgaze?
To evaluate the lens's lag and sag
What is the recommended method to ensure proper placement of an RGP lens during insertion?
Place the lens directly on the cornea
What is the purpose of assessing the RGP lens's static fit?
To assess the lens's relationship with the cornea
What is the significance of reflex tearing in an RGP lens during initial fitting?
It causes excessive lens movement
What is the recommended technique to control lid margins during RGP lens removal?
Use the 'pinch' method
What is the purpose of assessing the RGP lens's centration?
To assess the lens's relationship with the cornea
What is the significance of a well-centred RGP lens?
It enhances the lens's tear exchange
What is the effect on the centre of gravity in a Riding Low High plus lens?
Centre of gravity moves further forward
What is the purpose of using buffered saline to wet the Fluorescein strip?
To maintain the pH level of the strip
What is the effect of increasing the BOZD on the fit of a lens?
It flattens the fit of the lens
What is the recommended approach to assess the centration of the lens?
Compare the inner and outer optic zone regions
What is the effect of reducing the BOZR by 0.05mm?
The tear film power increases by +0.25D
What is the purpose of using a diffuser when using Fluorescein?
To enhance the fluorescence effect
What is the effect of a Steep lens on the edge clearance?
It decreases the edge clearance
What is the recommended approach to achieve a smooth transition for tear exchange?
Achieve a smooth transition at the edge
What is the effect of increasing the Td on the fit of a lens?
It steepens the fit of the lens
What is the purpose of using a Wratten filter with Fluorescein?
To block UV light from the Burton lamp
Learn about the correct techniques for inserting and removing RGP lenses, including placement on the cornea, avoiding damage and effective removal methods. Improve your skills with video guidance and practical tips.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
