Contact Lens Oxygen Transmission Quiz

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What is a common consequence of non-compliance with wearing daily wear (DW) disposable contact lenses?

Improved vision

Excellent lens comfort

End-of-day dryness

Increased red eye events (correct)

Why should hydrogel lenses not be approved for extended wear (EW) according to the text?

They offer excellent immediate comfort

They do not provide enough oxygen for overnight wear (correct)

They are more cost-effective

They reduce exposure to preserved solution

What is one of the benefits associated with SiHY (silicone hydrogel) soft contact lenses from a patient's perspective?

End-of-day dryness

Immediate lens comfort (correct)

Improved biocompatibility

Increased red eye events

Why can more frequent lens replacement not completely address red eye events in daily wearers according to the text?

It does not address non-compliance issues Signup and view all the answers

What is one of the main drawbacks of hydrogel lenses for extended wear highlighted in the text?

They can result in red eyes due to lack of oxygen Signup and view all the answers

What is the possible consequence of noncompliance with extended wear (EW) and continuous wear (CW) of hydrogel contact lenses?

Increased risk of dryness and blur Signup and view all the answers

Why was the approval of disposable Soft Contact Lenses (SCL) in 1987 seen as a significant advancement?

To reduce complications associated with lens wear Signup and view all the answers

What is a potential complication faced by patients who have more than -6.00 correction post refractive surgery?

Halos and night vision blur due to small treatment zone Signup and view all the answers

What was one of the motivations behind the development of disposable Soft Contact Lenses (SCL) in 1987?

To reduce complications like GPC and blur Signup and view all the answers

What is a potential consequence of post-surgical flap displacement problems?

Halos and night vision blur due to flap displacement Signup and view all the answers

What is the potential consequence of not complying with the recommended temporary D/C lens wear during treatment?

Vessel progression into the cornea Signup and view all the answers

In the given scenario, why might a change in base curve (BC) be recommended to improve lens movement?

To enhance lens fit and movement Signup and view all the answers

What is the purpose of advising a patient about potential refitting into GP lenses if vessels extend 3mm into the cornea?

To address vessel progression that requires a different lens type Signup and view all the answers

What role do lubricants play in managing the condition described in the text?

Settling down the cornea Signup and view all the answers

How does wearing high DK lenses on a disposable basis affect lens fit when compared to previous lenses?

Allows for a looser fit to enhance movement Signup and view all the answers

What is the main concern related to using soft contact lenses with higher water content?

Less comfort and more dehydration of the eye Signup and view all the answers

Why is it recommended to get lenses with 30-40% water content instead of those with mid 50% water content?

To minimize the dehydration of the eye Signup and view all the answers

What is the primary goal behind using silicone hydrogel contact lenses?

Enhance bio-compatibility Signup and view all the answers

Why are hydrogel lenses preferred when patient comfort is a priority?

They have a lower water content for better hydration Signup and view all the answers

How does frequent lens replacement contribute to reducing complications in contact lens wearers?

Decreases the risk of microbial keratitis Signup and view all the answers

What is a possible consequence of a SiHy lens tightening up and having no movement on the eye?

Trapping of things under the lens causing irritation Signup and view all the answers

Why is it important to document the number of infiltrates in the eye?

To determine the significance of infiltrates and possible causes Signup and view all the answers

In the context of soft contact lens wear, what is a common consequence of corneal hypoxia?

Reduced epithelial adhesion Signup and view all the answers

What is the main reason why significant and serious adverse events are treated promptly in contact lens wearers?

To prevent sight-threatening complications Signup and view all the answers

What is a potential consequence of chronic hypoxia in the cornea?

Stromal edema Signup and view all the answers

What is the purpose of the Post lens tera film exchange mentioned in the text?

To facilitate oxygen transmission through the lenses Signup and view all the answers

In terms of oxygen transmission, why is it important for lenses to have a sufficient exchange rate per blink?

To ensure oxygen reaches the central part of the eye Signup and view all the answers

What did the 'Adverse Event Panel of International Society of Contact Lens Research' create a definition for?

Definition of Adverse Ocular Events Signup and view all the answers

What is the significance of the three categories of adverse events mentioned in the text?

They assist in classifying the severity of ocular events related to contact lenses Signup and view all the answers

What does the text suggest about the adverse effects of SiHY lenses compared to hydrogel lenses?

SiHY lenses and hydrogel lenses have similar adverse effects Signup and view all the answers

What is the most likely reason for the increased tearing, discomfort, and redness when the patient took the contact lenses off?

Congested vessels beyond the contact lens Signup and view all the answers

Based on the text, what could have contributed to the patient's constant mild tearing and bulbar injection?

Frequent wearing of lenses without breaks Signup and view all the answers

What was one of the symptoms experienced by the patient that was worse when the lenses were off?

Minimal lens awareness Signup and view all the answers

Why did the blood flow back up and become congested beyond the lens?

Blood was unable to flow under the tight lens edge Signup and view all the answers

What was one of the problems associated with shifting from daily wear to extended wear for this patient?

Increased discomfort with lenses off Signup and view all the answers

What change in lens schedule could have potentially reduced the patient's symptoms of tearing and redness?

Taking regular breaks from wearing lenses Signup and view all the answers

What factor may have contributed to the discomfort experienced by the patient when the lenses were off?

Congestion of vessels under the lens Signup and view all the answers

Why was there more discomfort with lenses off for this patient?

"It’s a shift from dw to fw to ew" Signup and view all the answers

"When she took off the cl, she had increased tearing and her eyes were more uncomfortable." What could be a reason for this increased discomfort?

"Moist lens being same material as accuve 2" Signup and view all the answers