CL Quiz 1B

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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?

It reflects the corneal curvature changes after surgery Signup and view all the answers

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

Vertical meridian Signup and view all the answers

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

Rigid gas-permeable contact lens Signup and view all the answers

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

'With-the-rule' astigmatism Signup and view all the answers

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

'With-the-rule' astigmatism Signup and view all the answers

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

B and C Signup and view all the answers

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

Flat and steep values respectively Signup and view all the answers

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

For determining contact lens fit Signup and view all the answers

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

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

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

Either before or after wearing contact lenses Signup and view all the answers

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

Accumulation of biofilms on the contact lenses Signup and view all the answers

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

To clean surfaces and kill bacteria on the contact lens Signup and view all the answers

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

They can increase symptoms compared to outdoor environments Signup and view all the answers

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

Orthokeratology (ortho k) Signup and view all the answers

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

To accommodate variations in iris size and patient needs Signup and view all the answers

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

Selecting a larger diameter contact lens to avoid edge irritation 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?

To ensure the contact lens can be fit appropriately Signup and view all the answers

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

Indicates irregular corneal symmetry Signup and view all the answers

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

To address irregular corneal curvature Signup and view all the answers

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

To ensure appropriate contact lens fitting Signup and view all the answers

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

Steep and flat corneal curvatures Signup and view all the answers

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

Assessing corneal symmetry 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?

To ensure appropriate contact lens fitting Signup and view all the answers

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

Ortho K cosmetic soft contact lens fitting Signup and view all the answers

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

Increased discomfort from contact lens Signup and view all the answers

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

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

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

Increased risk of adverse effects due to biofilm accumulation Signup and view all the answers

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

To reduce bacterial growth on the lenses Signup and view all the answers

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

They may cause increased symptoms compared to outdoor environments 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?

To accommodate for differences in pupil size Signup and view all the answers

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

Irritation to the eyes and discomfort Signup and view all the answers

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

"A need for smaller or larger vertical apertures when fitting contact lenses" Signup and view all the answers

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

To accommodate differences in vertical aperture between their eyes Signup and view all the answers

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

Increased risk of biofilm accumulation on the lenses Signup and view all the answers

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?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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