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39 Cards in this Set

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  • Back
if you have hypoxia, you should ______ the Dk/t
increase (O2 transmissability)
Siccation happens more often in _______ and ___ h2o content hyrogel lenses.
thin, low h2o
What are 2 signs of peripheral corneal furrow staining?
1- limbal epithelial hypertrophy
2- peripheral corneal "corrugation"
(both with furrow staining)
_____ is radial staining around the corneal periphery, near the limbus.
Limbal epithelial hypertrophy
Name 3 possible deposits on a hydrogel lens.
1- lipids
2- proteins
3-jelly bumps
If the corneal is hypoxic or has edema, what might you see, where are these located?
Striae, in decemets membrane, in the central cornea
______ are deac cells which have moved through the epithelium to the ocular surface with normal cell turnover. These are seen with retro. Do they indicate hypoxic conditions?
Microcysts and Vacuoles, excellent indicator for hypoxia
____________ is an acuumulation of fluid (small) filled cysts within the epithelium found in the central cornea secondary to lens wear.
mircocystic edema, theze are larger and different from microcysts and vacuoles
What are 4 conditions that might encourage neovasculariztion?
1- hypoxia
2- tight fitting lens
3- damaged lens
4- low Dk value
Is neovascularization active or inactive?
Active!
What is vascularization?
vessels where they are not expected to be seen. these are stable and inactive
Describe Contact Lens Induced Papillary Conjuctivitits (CLIC)
inflammation of the superior tarsal conj with papillae >1 mm; itching and mucous discharge
IS CLIC more common in hydrogels or Gas permeable?
Hydrogels
A too flat lens may "flute up" on a portion of the rim of the contact--this causes ____- of the upper eyelide.
GCP (a mechanical irritation)
a ________ is a collection of cells in the cornea (may or maynot be related to CTL wear)
corneal infiltrates
__________ is an inflammatory, mechanical or toxic reaction--you see corneal infiltrates without overlying epi-defects
infiltrative keratitis
_____ is the general term used to describe infiltrative events not categorized as CLARE, CLPU or MK.
infiltrative keratitis
If you see sterile infiltrates, you need to rule out _____.
thygeson's keratitis
CLARE stands for ____.
Contact Lens induced Red Eye
What are the 3 manifestations of CLARE?
1- conj injection (red eye)
2- IK
3- corneal staining
What are 4 ways to cause CLARE?
1- hypoxia
2- trapped debris
3- preservative adverse reactions
4- low-grade infections
What does CLPU mean?
Contact lens induced peripheral ulcers
What does CLPU normally occur?
in the periphery- midperiphery in the anterior stroma (it is a single white-gray lesion)
Do CLPU leave a scar?
Yes, it looks like a bulls eye (but it MAY fade in time)
What med. can you give a CLPU?
4GFQ
What does SEAL mean?
Superior arcuate epithelial lesion
What is a SEAL?
a mechanical break in the superior corneal epithelium
Will a SEAL stain with flurescene?
yes
What type of lenses are usually seen with SEALs?
Silicone hydrogels
_______ is an invasion and infection of corneal tissue by micro-organism such as bacteri, fungi, amoeba or viruses
microbial keratitis. (this is very BAD)
In what case is microbial keratitis most likely to occur?
in EW lenses with low Dk values
T or F: in microbial keratitis the pathogen is usually located right not top of the ulcer.
true
What are 4 symptoms of microbial keratitis?
1- redness
2- pain
3-photophobia
4- blur
What are some signs of microbial keratitis?
1- diffuse hyperemia
2-stroma infiltrates with overlying epithelial defects
3- anterior chamber responses
4- hypopyon
5- reduced VA
6- lid edema
7- discharge
Should you cycloplege someone with microbial keratitis?
yes
If you see hypopyon it the problem CLPU or MK?
MK
If you have severe pain, is the problem CLPU or MK?
MK
If you have intact staining, is the problem CLPU or MK?
CLPU (MK will have an epithelial defect)
If the defect is >1mm, is the problem CLPU or MK?
MK