Wk 3 Eye Labs & Diagnostics Flashcards
What is the name of this test?
Visual acuity test (Snellen chart)
What does 20/50 mean on the Snellen chart?
Patient can see at 20 feet what the healthy eye can see at 50 feet
How far away from the chart do you have the patient stand for the Snellen chart test?
20 feet
If a provider opts to use a eye chart/pocket chart, how far away from the patient’s face should it be held?
14 inches
Who is a candidate for a visual acuity test?
Routine screening
Cataracts
Retinal detachment
What type of scope allows the provider to view the fundus of the eye?
Ophthalmoscope
What is included in the fundus of eye? (5)
Red reflex
Optic disc
Optic blood vessels
Fundus
Macula
How is a ophthalmoscope used?
Darken room to dilate pupil
Move in from 12-15 inches away from the side of the patient’s line of vision
When using an ophthslmoscope, what is the provider looking for when assessing a patient with glaucoma?
Optic disc cupping
This is an example of…
Optic disc cupping
In glaucoma, the optic nerve has cupping, which causes it to get __.
larger
What does a glare test do?
Quantifies vision loss associated with light scatter
Who is a candidate for a glare test?
A patient with cataracts
If a patient sees like this, what condition might they have?
Cataracts
The slit-lamp test maginifies which portion of the eye?
Anterior portion
The slit-lamp test uses a __-powered microscope
low
Who is a candidate for a slit-lamp test?
Cataracts (see white opaque lens)
Retinal detachment
Glaucoma
Macular degeneration
What does a slit-lamp test do for a patient with glaucoma?
Distinguishes between open-angle and closed-angle glaucoma
This patient is getting what type of test?
Slit lamp test
What does a tonometer measure?
Intraocular pressure (IOP)
When is a tonometer used?
In patients with glaucoma that we are concerned with an increase in IOP
How is a tonometer used?
Covered end of probe touches the anesthetized corneal surface
What is the normal range for IOP?
10-21 mmHg
Who is IOP testing indicated for?
Anyone over 40 years old
If a patient has a family history of glaucoma, how many times should they get their IOP tested?
1-2x a year
What indicates the onset of glaucoma?
An increase in IOP
Glaucoma is a __ disease
silent
What type of tonometer is the gold standard?
Goldman’s applanation tonometer
What type of tonometer can a patient use at home?
Tonopen
Self-testing tonometers are in their…
infancy
If a patient has high IOP, what test is indicated?
Gonioscopy
What does a gonioscopy do?
Determines whether open-angle or closed-angle glaucoma is present
What type of test is being performed on this patient?
Gonioscopy
What does a gonioscopy give visualization of?
Anterior part of the eye, where the iris meets the cornea
What are four additional tests that someone might undergo for diagnostic testing of the eye?
CT
MRI
Radioisotope scanning
Ultrasonography
(all are painless and need no follow up)
