41 Questions
What are scleral lenses used for?
To correct irregular astigmatism
What is the main purpose of scleral lenses?
To correct irregular astigmatism
What are some risk factors for microbial keratitis?
Poor hygiene, overnight wear, and smoking
What are the risk factors for microbial keratitis?
Poor hygiene, overnight wear, and smoking
What are scleral lenses used for?
Correcting irregular astigmatism
What were the first contact lenses made of?
Glass
What were the first contact lenses made from?
Glass
What is the management for corneal staining?
Ceasing lens wear and removing toxins
What were the first contact lenses made of?
Glass
What are the causes of corneal staining?
Mechanical, exposure, metabolic, toxic, allergies, or infectious factors
When were PMMA lenses introduced?
In the early 1900s
When are scleral lenses used?
Only when other lenses are not applicable
When are scleral lenses used?
When other lenses are not applicable
How should asymptomatic corneal infiltrates be managed?
Ceasing lens wear and changing from extended wear to daily wear
What should be done if someone has asymptomatic corneal infiltrates?
Differentiate between infiltrative keratitis and manage by ceasing lens wear and changing to daily wear
What is contact lens peripheral ulcer?
An inflammatory reaction that leaves Bowman's layer intact
What is contact lens peripheral ulcer?
An inflammatory reaction of the cornea that leaves Bowman's layer intact
What are the disadvantages of scleral lenses?
Discomfort and difficulty adapting for some patients
What are the disadvantages of scleral lenses?
Discomfort and difficulty adapting for some patients
What are the disadvantages of scleral lenses?
Discomfort and difficulty adapting
How are mini sclerals fitted?
By sag/depth
What are some symptoms of microbial keratitis?
Photophobia, severe pain, discharge, and lid swelling
What are the symptoms of microbial keratitis?
Photophobia, severe pain, discharge, and lid swelling
What happens when a spherical lens is placed on an astigmatic cornea?
Inferior steepening
What does a spherical lens on an astigmatic cornea look like?
Steep where the lens has lifted off
How are mini scleral lenses fitted?
By sag/depth
What can cause bacterial keratitis?
Corneal abrasion, entropion, dry eye, CL wear, or long-term steroid use
How are scleral lenses fitted?
Using sag/depth
What are some causes of bacterial keratitis?
Both A and B
What are the three assessments done when checking the lens?
Central clearance, limbal clearance, and scleral landing
How is central lens clearance assessed?
Using OCT or optic section on slit lamp
What is the cause of epithelial microcysts?
Acidosis
What is assessed when checking a scleral lens?
Central clearance, limbal clearance, and scleral landing
How can epithelial microcysts be managed?
By reducing lens wear and using higher DK/t lenses or switching to RGP lenses
How can lenticular astigmatism be stabilized?
Using a prism ballast or toric periphery
How is limbal clearance assessed?
By increasing sag
How can central lens clearance be assessed?
Using OCT
How are scleral lenses removed?
By using a suction device
How is limbal clearance assessed?
By increasing sag until fluorescein shows
What are other considerations for scleral lens fitting?
High levels of astigmatism and lenticular astigmatism
What are some obstacles to wearing scleral lenses?
Conjunctival prolapse, deposits, excessive settling back, and fogging
Study Notes
- Risk factors for microbial keratitis include poor hygiene, overnight wear, and smoking.
- Corneal staining can be caused by mechanical, exposure, metabolic, toxic, allergies, or infectious factors, and management includes ceasing lens wear and removing toxins.
- Asymptomatic corneal infiltrates should be differentially diagnosed with infiltrative keratitis, and management includes ceasing lens wear and changing from extended wear to daily wear.
- Contact lens peripheral ulcer is an inflammatory reaction of the cornea that leaves Bowman's layer intact.
- Symptoms of microbial keratitis include photophobia, severe pain, discharge, and lid swelling, and risk factors include diabetes and poor hygiene.
- Bacterial keratitis can be caused by corneal abrasion, entropion, dry eye, CL wear, or long-term steroid use.
- Staphylococcus appears as a yellow-white dense infiltration, while Pseudomonas aeruginosa causes a rapidly progressing irregular ulcer that can perforate the cornea.
- A positive culture indicates infectious infiltrative keratitis.
- 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.
- Stromal edema is caused by a hypoxic lens environment and can progress through stages of striae, folds, and haze.
- Neovascularization is caused by a hypoxic environment and can be managed with higher DK lenses and decreasing wearing time.
- Predisposing factors for lens wear include a moist conjunctival sac and corneal abrasions.
- Risk factors for sterile infiltrative keratitis include age, ametropia, smoking, and extended or continuous wear.
- CLARE can cause pain, photophobia, tearing, and small corneal infiltrates, and management includes steroids, hot compresses, and improving care and hygiene.
- Bedewing is deposits or pigment spots on the endothelium, and management involves reducing or ceasing lens wear.
- Blebs are black non-reflective areas that indicate hypoxia and hypercapnia and require ceasing lens wear and changing materials.
- Polymegathism is a change in endothelial size that can be accelerated by CL wear and requires reducing WT and using higher DK lenses.
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.
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