Are You an Expert in Contact Lens-Related Eye Conditions?
41 Questions
0 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 are scleral lenses used for?

  • To correct regular astigmatism
  • To correct nearsightedness
  • To correct farsightedness
  • To correct irregular astigmatism (correct)

    • What is the main purpose of scleral lenses?

  • To correct irregular astigmatism (correct)
  • To correct nearsightedness
  • To correct presbyopia
  • To correct farsightedness

    • What are some risk factors for microbial keratitis?

  • Poor hygiene, daily wear, and non-smoking
  • Poor hygiene, overnight wear, and smoking (correct)
  • Good hygiene, extended wear, and smoking
  • Good hygiene, daily lens wear, and non-smoking

    • What are the risk factors for microbial keratitis?

    <p>Poor hygiene, overnight wear, and smoking</p> Signup and view all the answers

    What are scleral lenses used for?

    <p>Correcting irregular astigmatism</p> Signup and view all the answers

    What were the first contact lenses made of?

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

    What were the first contact lenses made from?

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

    What is the management for corneal staining?

    <p>Ceasing lens wear and removing toxins</p> Signup and view all the answers

    What were the first contact lenses made of?

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

    What are the causes of corneal staining?

    <p>Mechanical, exposure, metabolic, toxic, allergies, or infectious factors</p> Signup and view all the answers

    When were PMMA lenses introduced?

    <p>In the early 1900s</p> Signup and view all the answers

    When are scleral lenses used?

    <p>Only when other lenses are not applicable</p> Signup and view all the answers

    When are scleral lenses used?

    <p>When other lenses are not applicable</p> Signup and view all the answers

    How should asymptomatic corneal infiltrates be managed?

    <p>Ceasing lens wear and changing from extended wear to daily wear</p> Signup and view all the answers

    What should be done if someone has asymptomatic corneal infiltrates?

    <p>Differentiate between infiltrative keratitis and manage by ceasing lens wear and changing to daily wear</p> Signup and view all the answers

    What is contact lens peripheral ulcer?

    <p>An inflammatory reaction that leaves Bowman's layer intact</p> Signup and view all the answers

    What is contact lens peripheral ulcer?

    <p>An inflammatory reaction of the cornea that leaves Bowman's layer intact</p> Signup and view all the answers

    What are the disadvantages of scleral lenses?

    <p>Discomfort and difficulty adapting for some patients</p> Signup and view all the answers

    What are the disadvantages of scleral lenses?

    <p>Discomfort and difficulty adapting for some patients</p> Signup and view all the answers

    What are the disadvantages of scleral lenses?

    <p>Discomfort and difficulty adapting</p> Signup and view all the answers

    How are mini sclerals fitted?

    <p>By sag/depth</p> Signup and view all the answers

    What are some symptoms of microbial keratitis?

    <p>Photophobia, severe pain, discharge, and lid swelling</p> Signup and view all the answers

    What are the symptoms of microbial keratitis?

    <p>Photophobia, severe pain, discharge, and lid swelling</p> Signup and view all the answers

    What happens when a spherical lens is placed on an astigmatic cornea?

    <p>Inferior steepening</p> Signup and view all the answers

    What does a spherical lens on an astigmatic cornea look like?

    <p>Steep where the lens has lifted off</p> Signup and view all the answers

    How are mini scleral lenses fitted?

    <p>By sag/depth</p> Signup and view all the answers

    What can cause bacterial keratitis?

    <p>Corneal abrasion, entropion, dry eye, CL wear, or long-term steroid use</p> Signup and view all the answers

    How are scleral lenses fitted?

    <p>Using sag/depth</p> Signup and view all the answers

    What are some causes of bacterial keratitis?

    <p>Both A and B</p> Signup and view all the answers

    What are the three assessments done when checking the lens?

    <p>Central clearance, limbal clearance, and scleral landing</p> Signup and view all the answers

    How is central lens clearance assessed?

    <p>Using OCT or optic section on slit lamp</p> Signup and view all the answers

    What is the cause of epithelial microcysts?

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

    What is assessed when checking a scleral lens?

    <p>Central clearance, limbal clearance, and scleral landing</p> Signup and view all the answers

    How can epithelial microcysts be managed?

    <p>By reducing lens wear and using higher DK/t lenses or switching to RGP lenses</p> Signup and view all the answers

    How can lenticular astigmatism be stabilized?

    <p>Using a prism ballast or toric periphery</p> Signup and view all the answers

    How is limbal clearance assessed?

    <p>By increasing sag</p> Signup and view all the answers

    How can central lens clearance be assessed?

    <p>Using OCT</p> Signup and view all the answers

    How are scleral lenses removed?

    <p>By using a suction device</p> Signup and view all the answers

    How is limbal clearance assessed?

    <p>By increasing sag until fluorescein shows</p> Signup and view all the answers

    What are other considerations for scleral lens fitting?

    <p>High levels of astigmatism and lenticular astigmatism</p> Signup and view all the answers

    What are some obstacles to wearing scleral lenses?

    <p>Conjunctival prolapse, deposits, excessive settling back, and fogging</p> Signup and view all the answers

    Study Notes

    1. Risk factors for microbial keratitis include poor hygiene, overnight wear, and smoking.
    2. Corneal staining can be caused by mechanical, exposure, metabolic, toxic, allergies, or infectious factors, and management includes ceasing lens wear and removing toxins.
    3. Asymptomatic corneal infiltrates should be differentially diagnosed with infiltrative keratitis, and management includes ceasing lens wear and changing from extended wear to daily wear.
    4. Contact lens peripheral ulcer is an inflammatory reaction of the cornea that leaves Bowman's layer intact.
    5. Symptoms of microbial keratitis include photophobia, severe pain, discharge, and lid swelling, and risk factors include diabetes and poor hygiene.
    6. Bacterial keratitis can be caused by corneal abrasion, entropion, dry eye, CL wear, or long-term steroid use.
    7. Staphylococcus appears as a yellow-white dense infiltration, while Pseudomonas aeruginosa causes a rapidly progressing irregular ulcer that can perforate the cornea.
    8. A positive culture indicates infectious infiltrative keratitis.
    9. Epithelial microcysts are caused by acidosis and can be managed by reducing lens wear and using higher DK/t lenses or switching to RGP lenses.
    10. Stromal edema is caused by a hypoxic lens environment and can progress through stages of striae, folds, and haze.
    11. Neovascularization is caused by a hypoxic environment and can be managed with higher DK lenses and decreasing wearing time.
    12. Predisposing factors for lens wear include a moist conjunctival sac and corneal abrasions.
    13. Risk factors for sterile infiltrative keratitis include age, ametropia, smoking, and extended or continuous wear.
    14. CLARE can cause pain, photophobia, tearing, and small corneal infiltrates, and management includes steroids, hot compresses, and improving care and hygiene.
    15. Bedewing is deposits or pigment spots on the endothelium, and management involves reducing or ceasing lens wear.
    16. Blebs are black non-reflective areas that indicate hypoxia and hypercapnia and require ceasing lens wear and changing materials.
    17. Polymegathism is a change in endothelial size that can be accelerated by CL wear and requires reducing WT and using higher DK lenses.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Are you a contact lens wearer or eye care professional? Test your knowledge about contact lens-related eye conditions with this quiz! From microbial keratitis to stromal edema, this quiz covers a range of topics related to contact lens wear and eye health. Brush up on your understanding of risk factors, symptoms, and management strategies for various eye conditions associated with contact lens wear. Don't forget to include keywords specific to eye health and contact lens wear in your title and description for better search engine optimization.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser