Understanding Sagittal Depth in Lens Parameters
21 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 does the sagittal depth (CL-SAG) parameter define?

  • The height of the lens (correct)
  • The curvature of the lens
  • The width of the lens
  • The thickness of the lens
  • How does the sagittal depth change as the lens diameter increases?

  • It increases (correct)
  • It remains constant
  • It decreases
  • It varies randomly
  • What method is used to determine the base curve (BOZR) in relation to perspex domes?

  • Templates method (correct)
  • Indexing method
  • Dilation method
  • Grading method
  • Why is it recommended to make HWC lenses thicker despite having high DK?

    <p>Thicker lenses dehydrate less</p> Signup and view all the answers

    Which substances can bind to the surface of hydrogel contact lenses?

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

    What is the purpose of using translucent tints in enhancing SCLs?

    <p>To enhance natural eye color</p> Signup and view all the answers

    Why are thin HWC lenses not ideal in terms of dehydration?

    <p>They cover the area with the least tear coverage</p> Signup and view all the answers

    What will happen if the lens is flatter than the dome?

    <p>A section of the lens edge will lift off the periphery of the dome.</p> Signup and view all the answers

    What is a common advantage of Spherical SCLs?

    <p>Better initial comfort compared to RGPs.</p> Signup and view all the answers

    What is a unique feature of High DK SiHy SCLs?

    <p>They provide more oxygen for ocular health.</p> Signup and view all the answers

    What is the typical range for Base Curve (BC) in soft contact lenses?

    <p>8.0-9.20mm</p> Signup and view all the answers

    How does the Center Thickness (CT) of soft contact lenses compare to rigid gas permeable lenses?

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

    What does a higher Water Content (WC) in soft contact lenses generally result in?

    <p>Challenging handling</p> Signup and view all the answers

    What parameter is considered the most important when dealing with Soft Contact Lenses (SCLs)?

    <p>Base Curve</p> Signup and view all the answers

    How does increasing the Center Thickness (CT) impact the rigidity of soft contact lenses?

    <p>Increases rigidity</p> Signup and view all the answers

    What does lenticulated design in soft contact lenses aim to maintain?

    <p>Thin profile</p> Signup and view all the answers

    What is the typical Center Thickness (CT) for a -3D soft contact lens?

    <p>-0.09mm</p> Signup and view all the answers

    If a soft contact lens has a low Water Content (WC), what characteristic is it likely to have?

    <p>Less durability</p> Signup and view all the answers

    What does a larger Overall Diameter (OAD) in soft contact lenses contribute to?

    <p>Increased tear exchange</p> Signup and view all the answers

    What is the primary reason behind lenticulating soft contact lenses?

    <p>To maintain a thin profile of the lens</p> Signup and view all the answers

    Which factor determines the rigidity of soft contact lenses relating to Central Thickness?

    <p>(CT)3</p> Signup and view all the answers

    Use Quizgecko on...
    Browser
    Browser