CL Quiz 1B
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Questions and Answers

What is the primary reason for measuring pupil size in a patient with an 8mm pupil size under dim light?

  • To identify irregular corneal curvature
  • To assess corneal shape using topography
  • To determine the best contact lens size for the patient
  • To ensure patient proper contact lens for both dim and bright illumination (correct)

    • In corneal curvature measurements, why is the flattest corneal curvature more important?

  • It has the lowest diopter value (correct)
  • It is more relevant for patients with refractive surgery
  • It represents the horizontal meridian
  • It indicates the best visual acuity for the patient

    • A patient with regular 'with-the-rule' astigmatism would have corneal axis measurements at approximately:

  • Opposite to each other
  • 45 degrees away from each other
  • Parallel to each other
  • 90 degrees away from each other (correct)

    • Why is the flat K value more relevant for a patient post refractive surgery?

    <p>It reflects the corneal curvature changes after surgery</p> Signup and view all the answers

    In the context of corneal curvature, which meridian is typically steeper in 'with-the-rule' astigmatism?

    <p>Vertical meridian</p> Signup and view all the answers

    What type of contact lens would be suitable for a patient with irregular corneal curvature?

    <p>Rigid gas-permeable contact lens</p> Signup and view all the answers

    What does a difference in curvatures between the horizontal and vertical meridians indicate?

    <p>'With-the-rule' astigmatism</p> Signup and view all the answers

    What does a flatter horizontal meridian indicate in corneal curvature measurements?

    <p>'With-the-rule' astigmatism</p> Signup and view all the answers

    Why is it important to inform a patient about potential blurriness before complaints?

    <p>B and C</p> Signup and view all the answers

    What do 45.4D and 45.9D values represent in corneal curvature measurements?

    <p>Flat and steep values respectively</p> Signup and view all the answers

    Why is it important to focus more on the flattest corneal curvature?

    <p>For determining contact lens fit</p> Signup and view all the answers

    What complication can arise from using topical medications while wearing contact lenses?

    <p>The medication may not reach the epithelium due to the presence of the contact lens</p> Signup and view all the answers

    What is the recommended timing for placing topical drops when a patient is wearing contact lenses?

    <p>Either before or after wearing contact lenses</p> Signup and view all the answers

    What is a risk associated with wearing contact lenses beyond the prescribed duration?

    <p>Accumulation of biofilms on the contact lenses</p> Signup and view all the answers

    What is the purpose of surfactants in cleaning/contact lens solutions?

    <p>To clean surfaces and kill bacteria on the contact lens</p> Signup and view all the answers

    How can air-controlled environments affect a patient's experience of wearing contact lenses?

    <p>They can increase symptoms compared to outdoor environments</p> Signup and view all the answers

    What is a potential alternative for swimmers or individuals wearing goggles over contact lenses?

    <p>Orthokeratology (ortho k)</p> Signup and view all the answers

    Why is it important to measure both vertical aperture and horizontal visible iris diameter for fitting contact lenses?

    <p>To accommodate variations in iris size and patient needs</p> Signup and view all the answers

    What should be taken into account when fitting a patient with corneal scar?

    <p>Selecting a larger diameter contact lens to avoid edge irritation</p> Signup and view all the answers

    What is the relevance of measuring pupil size in a patient with an 8mm pupil size under dim light?

    <p>To ensure the contact lens can be fit appropriately</p> Signup and view all the answers

    What is the significance of a difference in curvatures between the horizontal and vertical meridians in corneal measurements?

    <p>Indicates irregular corneal symmetry</p> Signup and view all the answers

    Why is the flat K value more relevant for a patient post refractive surgery?

    <p>To address irregular corneal curvature</p> Signup and view all the answers

    In corneal curvature measurements, why is the flattest corneal curvature more important?

    <p>To ensure appropriate contact lens fitting</p> Signup and view all the answers

    What do 45.4D and 45.9D values represent in corneal curvature measurements?

    <p>Steep and flat corneal curvatures</p> Signup and view all the answers

    What should be taken into account when fitting a patient with irregular corneal curvature?

    <p>Assessing corneal symmetry</p> Signup and view all the answers

    What is the primary reason for measuring pupil size in a patient with an 8mm pupil size under dim light?

    <p>To ensure appropriate contact lens fitting</p> Signup and view all the answers

    What is a potential alternative for swimmers or individuals wearing goggles over contact lenses?

    <p>Ortho K cosmetic soft contact lens fitting</p> Signup and view all the answers

    What is a common symptom experienced by a patient with an active chalazion?

    <p>Increased discomfort from contact lens</p> Signup and view all the answers

    Why is it not recommended to apply topical medications when wearing contact lenses?

    <p>Contact lenses can inhibit the medication from adequately reaching the eye's epithelium</p> Signup and view all the answers

    What effect can prolonged wear of contact lenses beyond the prescribed duration have on the eyes?

    <p>Increased risk of adverse effects due to biofilm accumulation</p> Signup and view all the answers

    What is the purpose of surfactants in cleaning/contact lens solutions?

    <p>To reduce bacterial growth on the lenses</p> Signup and view all the answers

    How can air-controlled environments affect a patient's experience of wearing contact lenses?

    <p>They may cause increased symptoms compared to outdoor environments</p> Signup and view all the answers

    What is the primary purpose of measuring both vertical aperture and horizontal visible iris diameter for fitting contact lenses?

    <p>To accommodate for differences in pupil size</p> Signup and view all the answers

    What complication can arise from using non-preservative contact lens solutions?

    <p>Irritation to the eyes and discomfort</p> Signup and view all the answers

    What does a difference in curvatures between the horizontal and vertical meridians indicate in corneal curvature measurements?

    <p>&quot;A need for smaller or larger vertical apertures when fitting contact lenses&quot;</p> Signup and view all the answers

    Why would a patient need to be fit with two different vertical apertures?

    <p>To accommodate differences in vertical aperture between their eyes</p> Signup and view all the answers

    What is a risk associated with wearing contact lenses beyond the prescribed duration?

    <p>Increased risk of biofilm accumulation on the lenses</p> Signup and view all the answers

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