Podcast
Questions and Answers
What are scleral lenses used for?
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?
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?
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?
What are the risk factors for microbial keratitis?
What are scleral lenses used for?
What are scleral lenses used for?
What were the first contact lenses made of?
What were the first contact lenses made of?
What were the first contact lenses made from?
What were the first contact lenses made from?
What is the management for corneal staining?
What is the management for corneal staining?
What were the first contact lenses made of?
What were the first contact lenses made of?
What are the causes of corneal staining?
What are the causes of corneal staining?
When were PMMA lenses introduced?
When were PMMA lenses introduced?
When are scleral lenses used?
When are scleral lenses used?
When are scleral lenses used?
When are scleral lenses used?
How should asymptomatic corneal infiltrates be managed?
How should asymptomatic corneal infiltrates be managed?
What should be done if someone has asymptomatic corneal infiltrates?
What should be done if someone has asymptomatic corneal infiltrates?
What is contact lens peripheral ulcer?
What is contact lens peripheral ulcer?
What is contact lens peripheral ulcer?
What is contact lens peripheral ulcer?
What are the disadvantages of scleral lenses?
What are the disadvantages of scleral lenses?
What are the disadvantages of scleral lenses?
What are the disadvantages of scleral lenses?
What are the disadvantages of scleral lenses?
What are the disadvantages of scleral lenses?
How are mini sclerals fitted?
How are mini sclerals fitted?
What are some symptoms of microbial keratitis?
What are some symptoms of microbial keratitis?
What are the symptoms of microbial keratitis?
What are the symptoms of microbial keratitis?
What happens when a spherical lens is placed on an astigmatic cornea?
What happens when a spherical lens is placed on an astigmatic cornea?
What does a spherical lens on an astigmatic cornea look like?
What does a spherical lens on an astigmatic cornea look like?
How are mini scleral lenses fitted?
How are mini scleral lenses fitted?
What can cause bacterial keratitis?
What can cause bacterial keratitis?
How are scleral lenses fitted?
How are scleral lenses fitted?
What are some causes of bacterial keratitis?
What are some causes of bacterial keratitis?
What are the three assessments done when checking the lens?
What are the three assessments done when checking the lens?
How is central lens clearance assessed?
How is central lens clearance assessed?
What is the cause of epithelial microcysts?
What is the cause of epithelial microcysts?
What is assessed when checking a scleral lens?
What is assessed when checking a scleral lens?
How can epithelial microcysts be managed?
How can epithelial microcysts be managed?
How can lenticular astigmatism be stabilized?
How can lenticular astigmatism be stabilized?
How is limbal clearance assessed?
How is limbal clearance assessed?
How can central lens clearance be assessed?
How can central lens clearance be assessed?
How are scleral lenses removed?
How are scleral lenses removed?
How is limbal clearance assessed?
How is limbal clearance assessed?
What are other considerations for scleral lens fitting?
What are other considerations for scleral lens fitting?
What are some obstacles to wearing scleral lenses?
What are some obstacles to wearing scleral lenses?
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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.
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