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29 Cards in this Set
- Front
- Back
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how much more common is glaucoma in Aa than caucasians?
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6-8
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What did the Baltimore eye study find the prevalence of glaucoma to be in whites vs. blacks?
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1.7% white and 5.59% blacks
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what is a risk factor that puts blacks at a greater risk?
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thinner corneas
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what present did did a study out of Olmstead County, MN find was the probably of blindness in COAG after 20 years?
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27% in one eye and 9% in both eyes
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according to the baltimore eye study what percent of people do not know they have glaucoma?
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50%
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if your patient has glaucoma what is the possibility that living relatives have glaucoma?
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27% Caucasians and 50% AAtrue
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true or false roughly 55% of patients with glaucoma have IOPs above 21
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false, les than half of new glaucoma cases occur at IOPs aboe 21
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who is a glaucoma suspect?
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1. large cups/normal IOPs and VFs
2. OHT and normal ONH, VF 3. VF defect, normal IOPs and ONH |
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what is Ocular hypertension?
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IOPs>21, normal optic nerve, normal VF, open angle, no known ocular or systemic condition accounting for increased IOP
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what is normal tension glaucoma? what is more common in this form of glaucoma?
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IOPs lower than 22.
acquired pits (infra or supra temporal poles), peripapillary atrophy, and france hem are more common true |
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what are fix risk factors for normal tension glaucoma?
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1. migrains
2. sleep apnea 3. raynaud's a 4. females 5. asians |
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where are the visual defects found in normal tension glaucoma?
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closer to fixation
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true or false APD, and central vision lose are common in glaucoma
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false
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what does the mechanical compression theory suggest?
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elevated IOP causes a backward bowing of the lamina cribrosa, kinking the axons as they exit the lamina pores-this may lead to focal ischemia, deprive the axons of neurtrophins or interfere with axoplasmic flow--triggering cell death
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what is the formula for ocular blood flow?
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ocular blood flow = mean B/P - IOP/Resistance
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true or false neuroprotection is intervention directed as saving retinal ganglion cells by lower IOP
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false
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risk factors for glaucoma include;
High myopia in ________ and high hyperopia in ______ |
myopia-open angle glaucoma
hyperopia-angle closure glaucoma |
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a fluctuation of diurnal IOP greater than _____ is abnormal
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6mmHg, normal less than 3-4
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true or false IOp is generally high run AM and lowest in evening
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true
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true or false. BP and IOP fall during sleep
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false BP falls but IOP does not. possible peak pressure right before awakening
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formaula for ocular perfusion pressure?
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ocular perfusion pressure=diastolic BP-IOP
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true or false
there is a direct correlation between IOp and damage |
false
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golamann applanation assumes a CCt of?
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520um
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what is average CCT?
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544 +/- 34 microns, 531 blacks, 558 whites, 520 Asians
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applanation over or under estimates IOP by as much as ________mmHg for every _____CCt difference from 545um
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2.5-3.5 for every 50um CCT from 545. effect is thought to not be linear, on thinner cornea the greater the deviation the greater the effect
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true or false the OHTS predicted that the influence of CCt as a risk factor was less than that predicted for by correcting IOP readings for thickness
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false, more
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what are the 5Rs in optic disc examination?
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scleral Ring, Rim, Retinal/optic disc hemorrhages, Region of parapapillary atrophy, RNFL
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normal CDs are larger_________than_________ because the optic disc is______oval and the cup is __________oval
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larger horizontally than vertically because the ptic disc is vertically oval and the cup is horizontally oval
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what is an average cd?
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whites 0.4, black 0.6, others -.5
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