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24 Cards in this Set
- Front
- Back
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Liquifaction of the vitreous occurs in the center or periphery of the vitreous?
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center
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Liquifaction is accelerated in diabetics due to?
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advanced glycosylation end products
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Damage to hyaluronic acid and collagen causes liquefaction, these are that target of what?
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free radicals
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Weiss's ring is a sign of what disease?
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posterior vitreal detachement --PVD
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How does the vitreous support the retina?
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-minimizes retinal detachments
-cushins mechanical impact -supports system for lens |
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How does the vitreous act as a barrier?
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gel separates the anterior and posterior orbit
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-diffusion through the vitreous barrier is fast/slow?
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slow
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Do antibiotics in the bloodstream reach the vitreous center?
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no
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True or false
-The vitreous prevents topical agents from reaching the optic nerve or retina |
true
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What is the vitreous an reservoir of?
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vitamin C and antioxidants
glucose and glycogen |
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What type of homeostasis does the vitreous assist the retina with?
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potassium
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What is a reason for a vitrectomy?
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diabetic retinopathy, too much VEGF is building from the retina in the vitreous and can cause intensified neovascularization
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Where is an entopic phenomena located?
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within the eye.
-origin in the patients own eye |
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true or false
the further anterior a virtual floater, the more bothersome it is to the patient. |
false
more posterior, more bothersome |
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What is an asteroid hyalosis?
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calcium soap within the vitreous
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An asteroid hyalosis,
a. causes light to scatter b. reduces the total amount of light c. is very symptomatic d is usually bilateral |
B. reduces the total amount of light
-patient is relatively asymptomatic -usually unilateral |
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A patient comes into the clinic with symptoms of flashes of light, what could this be an indication of?
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posterior vitreal detachment
-the flashes of light are called Moore's lightning streaks |
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Your doctor is performing DO on you, and you notice a perkinje tree. Why causes this phenomena?
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arteries and veins are superficial to photoreceptors
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Where in the vitreous is the least amount of collagen?
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center
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How are AGEs formed?
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glucose reacting with proteins
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How do AGEs cause damage to the vitreous?
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promote cross-linking which causes damage
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most popular AGE?
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HbA1C
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What is a possible outcome of PVD, in terms of the retina?
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may create a retinal tear
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What are phosphenes?
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flashes of light caused by mechanical or electrical stimuli
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