RGP vs Soft Contact Lenses: Advantages & Disadvantages

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What is the primary reason for using a trial set in complex fitting?

To compare the total astigmatism present in the ocular Rx

To measure the corneal astigmatism present

To fit specialist keratoconus designs (correct)

To achieve a spherical RGP with mainly corneal astigmatism

What is the typical size of the Total Diameter (Td) in RGP lenses?

11-12mm

10-11mm

8-9mm

9-10mm (correct)

What is the purpose of measuring the Horizontal Visible Iris Diameter (HVID)?

To calculate the corneal astigmatism present

To set the total diameter of the lens (correct)

To determine the BOZD of the RGP lens

To assess the lid interaction with the lens

What is the advantage of using a large lens diameter?

It allows for a larger BOZD without sharp transitions Signup and view all the answers

What is the rule of thumb for calculating the corneal astigmatism from K readings?

0.05mm K approximates 0.25D Cyl power Signup and view all the answers

What is the primary reason for using a smaller Total Diameter (Td) in RGP lenses?

To reduce lid interaction and improve centration Signup and view all the answers

What is the purpose of converting the Spectacle Rx into Ocular Rx?

To calculate the total ocular astigmatism present Signup and view all the answers

What is the primary advantage of using Hybrid FS and Hybrid FS Plus lenses?

Harder material with increased resistance to protein and lipid deposits Signup and view all the answers

What is the primary disadvantage of using small diameter lenses?

The edge of the lens interacts with the sensitive edge of the lids and may be uncomfortable Signup and view all the answers

What is the purpose of calculating the corneal astigmatism from K readings?

To ensure alignment with the flattest meridian and tear lens correction Signup and view all the answers

What is an advantage of RGP lenses in terms of vision?

Sharper vision Signup and view all the answers

What is a disadvantage of RGP lenses in terms of cost?

Higher initial cost Signup and view all the answers

What is a benefit of RGP lenses for presbyopes?

Translating bifocals with less contrast loss Signup and view all the answers

What is a common replacement interval for RGP lenses?

6 months Signup and view all the answers

What is an important factor to consider when selecting an RGP material?

All of the above Signup and view all the answers

What is a disadvantage of RGP lenses in terms of patient comfort?

Modern soft CL cause limited neo Signup and view all the answers

What is a benefit of RGP lenses for patients with irregular corneas?

Better fit and vision Signup and view all the answers

What is a potential issue with RGP lenses in terms of corneal molding?

RGP lenses may be used beyond their best for corneal molding Signup and view all the answers

What is a potential complication of prolonged RGP lens use?

Induced ptosis Signup and view all the answers

What is a factor to consider when deciding what to order for a patient?

Patient's occupation Signup and view all the answers

What is the primary reason for ensuring alignment fit in RGP lenses?

To achieve an even spread of weight across the cornea Signup and view all the answers

What is a characteristic of Fluorosilicone Acrylates (FSAs) compared to Silicone Acrylates (SAs)?

FSAs are harder and relatively resistant to protein deposits Signup and view all the answers

What is the typical range of total astigmatism present in the BVD-corrected ocular Rx that can be corrected with a spherical RGP lens?

Up to 2.50DC Signup and view all the answers

What is the purpose of measuring the Vertical Palpebral Aperture (VPA)?

To assess the ease of insertion and removal Signup and view all the answers

Which type of RGP material is more prone to deposits and has a higher scratching surface?

Silicone Acrylates (SAs) Signup and view all the answers

What is the primary reason for using a large Total Diameter (Td) in RGP lenses?

To improve tear exchange and reduce edge stand-off Signup and view all the answers

What is the primary advantage of RGP lenses in terms of contrast reduction for presbyopes?

Translating bifocals reduce contrast less Signup and view all the answers

What is the purpose of converting the Spectacle Rx into Ocular Rx for EACH meridian?

To compare the total ocular astigmatism with corneal astigmatism Signup and view all the answers

What is a benefit of using a hybrid lens, such as Hybrid FS or Hybrid FS Plus?

Increased wettability and reduced flexure Signup and view all the answers

What is the main reason why modern soft contact lenses cause limited neovascularisation?

They are more permeable to oxygen Signup and view all the answers

What is the purpose of measuring the Horizontal Visible Iris Diameter (HVID)?

To determine the ideal lens diameter Signup and view all the answers

What is the primary factor to consider when deciding the replacement interval for RGP lenses?

The lenses' ability to maintain optimal performance Signup and view all the answers

What is a potential issue with using small diameter lenses?

Increased lid interaction and discomfort Signup and view all the answers

What is the primary advantage of using RGP lenses for patients with irregular corneas?

They provide better vision and fit Signup and view all the answers

What is the primary reason why RGP lenses are not suitable for extended wear?

They do not allow for sufficient oxygen transmission Signup and view all the answers

What is the primary benefit of using RGP lenses in terms of cost?

They are more cost-effective in the long run Signup and view all the answers

What is the primary factor to consider when selecting an RGP material?

Oxygen transmission and edge lift Signup and view all the answers

What is the primary disadvantage of RGP lenses in terms of care?

They require more in-depth care Signup and view all the answers

What is the primary benefit of using RGP lenses for patients who want to wear their lenses daily?

They provide better vision and fit Signup and view all the answers

What is the primary reason why RGP lenses may not be suitable for patients with certain occupations?

They may not be compatible with certain environmental conditions Signup and view all the answers

RGP vs Soft Contact Lenses: Advantages & Disadvantages

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Questions and Answers

What is the primary reason for using a trial set in complex fitting?

What is the typical size of the Total Diameter (Td) in RGP lenses?

What is the purpose of measuring the Horizontal Visible Iris Diameter (HVID)?

What is the advantage of using a large lens diameter?

What is the rule of thumb for calculating the corneal astigmatism from K readings?

What is the primary reason for using a smaller Total Diameter (Td) in RGP lenses?

What is the purpose of converting the Spectacle Rx into Ocular Rx?

What is the primary advantage of using Hybrid FS and Hybrid FS Plus lenses?

What is the primary disadvantage of using small diameter lenses?

What is the purpose of calculating the corneal astigmatism from K readings?

What is an advantage of RGP lenses in terms of vision?

What is a disadvantage of RGP lenses in terms of cost?

What is a benefit of RGP lenses for presbyopes?

What is a common replacement interval for RGP lenses?

What is an important factor to consider when selecting an RGP material?

What is a disadvantage of RGP lenses in terms of patient comfort?

What is a benefit of RGP lenses for patients with irregular corneas?

What is a potential issue with RGP lenses in terms of corneal molding?

What is a potential complication of prolonged RGP lens use?

What is a factor to consider when deciding what to order for a patient?

What is the primary reason for ensuring alignment fit in RGP lenses?

What is a characteristic of Fluorosilicone Acrylates (FSAs) compared to Silicone Acrylates (SAs)?

What is the typical range of total astigmatism present in the BVD-corrected ocular Rx that can be corrected with a spherical RGP lens?

What is the purpose of measuring the Vertical Palpebral Aperture (VPA)?

Which type of RGP material is more prone to deposits and has a higher scratching surface?

What is the primary reason for using a large Total Diameter (Td) in RGP lenses?

What is the primary advantage of RGP lenses in terms of contrast reduction for presbyopes?

What is the purpose of converting the Spectacle Rx into Ocular Rx for EACH meridian?

What is a benefit of using a hybrid lens, such as Hybrid FS or Hybrid FS Plus?

What is the main reason why modern soft contact lenses cause limited neovascularisation?

What is the purpose of measuring the Horizontal Visible Iris Diameter (HVID)?

What is the primary factor to consider when deciding the replacement interval for RGP lenses?

What is a potential issue with using small diameter lenses?

What is the primary advantage of using RGP lenses for patients with irregular corneas?

What is the primary reason why RGP lenses are not suitable for extended wear?

What is the primary benefit of using RGP lenses in terms of cost?

What is the primary factor to consider when selecting an RGP material?

What is the primary disadvantage of RGP lenses in terms of care?

What is the primary benefit of using RGP lenses for patients who want to wear their lenses daily?

What is the primary reason why RGP lenses may not be suitable for patients with certain occupations?

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