Soft Torics in Optics
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 percentage of the population has cylinders over 0.75DC?

  • 38% (correct)
  • 50%
  • 25%
  • 60%
  • What percentage of patients are not fitted with a toric lens when they should be?

  • 10% (correct)
  • 15%
  • 5%
  • 20%
  • What is the primary mechanism by which toric lenses rely on the blink reflex?

  • Cyclo-rotation of the eye
  • Nasal rotation of the lower lid
  • Vertical movement of the upper lid (correct)
  • Horizontal movement of the lower lid
  • What is a potential drawback of using prism ballast for stabilization?

    <p>Reduced oxygen transmission</p> Signup and view all the answers

    Which of the following is a characteristic of dynamic stabilization zones?

    <p>Edge is thinner</p> Signup and view all the answers

    What is the significance of knowing the stabilization design of a particular toric lens?

    <p>It can affect the performance of the lens on the eye</p> Signup and view all the answers

    What is a potential consequence of using a toric lens with a thick edge?

    <p>Reduced oxygen transmission</p> Signup and view all the answers

    What is an advantage of aspheric optics over torics?

    <p>Better for small cylinders</p> Signup and view all the answers

    What is a potential advantage of using daily disposables for toric lenses?

    <p>Reduced risk of neovascularisation</p> Signup and view all the answers

    What is the name of the design used in Acuvue Oasys for Astigmatism?

    <p>Precision Balance 8/4 design</p> Signup and view all the answers

    Why is the zipper effect important in toric lenses?

    <p>It assists in the orientation of the lens during blinking</p> Signup and view all the answers

    What is the primary advantage of dynamic stabilization zones?

    <p>They provide easier orientation of the lens</p> Signup and view all the answers

    Why may patients experience neovascularization with hydrogel prism-ballasted toric lenses?

    <p>Due to the low oxygen transmission</p> Signup and view all the answers

    What is a potential drawback of using toric lenses with a thick edge?

    <p>Reduced comfort</p> Signup and view all the answers

    Why are daily disposables an attractive option for toric lenses?

    <p>They eliminate the need for cleaning and maintenance</p> Signup and view all the answers

    What is the primary purpose of stabilization designs in toric lenses?

    <p>To orient the lens correctly</p> Signup and view all the answers

    Why is it important to know the stabilization design of a particular toric lens?

    <p>To troubleshoot issues with lens rotation</p> Signup and view all the answers

    What is the significance of the 10% statistic mentioned in the text?

    <p>10% of patients are not fitted with a toric lens when they should be</p> Signup and view all the answers

    How do aspheric optics compare to torics?

    <p>Aspheric optics are better for small cylinders</p> Signup and view all the answers

    What is the purpose of the Accelerated Stabilization Design (ASD) in toric lenses?

    <p>To assist in the orientation of the lens</p> Signup and view all the answers

    What is a characteristic of Soflens daily disposable toric lenses?

    <p>They are designed for early presbyopes</p> Signup and view all the answers

    What is the purpose of the 'zipper effect' in toric lenses?

    <p>To facilitate the stabilization of the lens</p> Signup and view all the answers

    What is a benefit of using daily disposables for toric lenses?

    <p>They are more comfortable</p> Signup and view all the answers

    What is a potential consequence of using a toric lens with a thick edge?

    <p>Reduced oxygen transmission</p> Signup and view all the answers

    What percentage of the population has cylinders over 2.00DC?

    <p>7%</p> Signup and view all the answers

    What is a characteristic of dynamic stabilization zones?

    <p>Thinner edge</p> Signup and view all the answers

    What is the significance of knowing the stabilization design of a particular toric lens?

    <p>To determine the best stabilization design for a patient</p> Signup and view all the answers

    What is a benefit of aspheric optics compared to torics?

    <p>Better for small cylinders</p> Signup and view all the answers

    What is the function of the upper lid in the 'zipper effect'?

    <p>To move up and down vertically</p> Signup and view all the answers

    What percentage of soft lenses are torics?

    <p>28%</p> Signup and view all the answers

    What percentage of patients may benefit from aspheric optics over torics?

    <p>7%</p> Signup and view all the answers

    What is a potential drawback of using prism ballast for stabilization?

    <p>Neovascularization</p> Signup and view all the answers

    What is the primary mechanism by which dynamic stabilization zones rely on the blink reflex?

    <p>Upper lid moving up and down vertically</p> Signup and view all the answers

    What is a benefit of using daily disposables for toric lenses?

    <p>Reduced risk of neovascularization</p> Signup and view all the answers

    What is a characteristic of the Accelerated Stabilization Design (ASD) in toric lenses?

    <p>Thinner edges</p> Signup and view all the answers

    What is a potential consequence of using a toric lens with a thick edge?

    <p>Neovascularization</p> Signup and view all the answers

    Why may gravity affect the performance of a prism-ballasted toric lens?

    <p>Gravity may rotate the lens</p> Signup and view all the answers

    What is a benefit of using aspheric optics compared to torics?

    <p>Better for small cylinders</p> Signup and view all the answers

    What is a characteristic of the 8/4 design in Acuvue Oasys for Astigmatism?

    <p>Dynamic stabilization zones</p> Signup and view all the answers

    What is a potential drawback of using SiHs compared to hydrogel torics?

    <p>Less common neovascularization</p> Signup and view all the answers

    More Like This

    Optics Science Olympiad Flashcards
    33 questions
    Optics and Photography History Quiz
    50 questions
    Optics Chapter 19 Flashcards
    25 questions

    Optics Chapter 19 Flashcards

    WellRegardedObsidian1129 avatar
    WellRegardedObsidian1129
    B-2 Physics Topic 2.4 Optics Quiz
    47 questions
    Use Quizgecko on...
    Browser
    Browser