Exam (elaborations)
PCOS EXAM | Questions with 100% Correct Verified Answers
- Course
- Institution
PCOS EXAM | Questions with 100% Correct Verified Answers
[Show more]
Seller
Follow
Content preview
PCOS EXAM | Questions with 100%Correct Verified Answers
What is the minimum separable acuity defined as? - ANSWER the ability to determine
the presence of, or distinguish among, more than one identifying feature in a visible
target
What does the minimum separable acuity measure? - ANSWER the resolution
threshold, or the smallest visual angle at which two separate objects can be
discriminated
How does minimum separable acuity testing work? - ANSWER Works by varying the
object size or space between object components
determines smallest change in feature
ex of tests) landolt C and grating acuity
What is minimum recognizable acuity? - ANSWER Discrimination of the spatial
characteristics of the test pattern and also the pattern that we recognize by previous
experience (faces, letters, symbols)
the angular size of the smallest feature that one can recognize or identify
Example of recognizable acuity test? - ANSWER Snellen
chart block letters are 5 times stroke size normal defined at 20
ft
at 20 ft, the 20/20 letter has a visual angle of 5 min arc, and each stroke 1 min arc
,What is MAR? - ANSWER minimum angle of resolution
critical detail in min of arc of the smallest recognizable letters
What is the MAR of the 20/20 letter? 20/40? - ANSWER 1) 20/20 = 1 MAR
2) 20/40 -> 40/20 = 2 MAR
T/F - The reciprocal of the Snellen Notation equals the angle (in min of arc) subtended
by the strokes of the letter at the person's eye - ANSWER True!!
This is called Minimum angle of resolution (MAR) and can also be given in log10 form,
abbreviated as logMAR
this angle also specifies visual acuity
What does minimum discriminable acuity determine? - ANSWER The relative location
of two or more visible features with regard to each other
The angular size of the smallest change in the feature that one can identify
What is normal angular threshold of discrimination for resolution? - ANSWER 30-60
seconds of an arc (min angle of resolution)
What is vernier acuity? - ANSWER when one vertical line is displaced until the observer
can determine if the upper line is to the right or left of the lower line
What is an example of a clinical application of of minimum discriminable acuity? -
ANSWER Mires in GAT (goldsman applanation tonometry)
What is the procedure to take VA's in distance and near? - ANSWER 1) Take DVA SC
OD, then OS, then OU then cc OD, OS, OU
because if patient has Srx, do first without correction (sc) then with correction (cc)
2) take NVA sc OD, OS, OU then cc OD, OS,
OU report as test distance / smallest line read
When would you use the pinhole VA? - ANSWER If the pt. cannot see 20/20 at
a distance with habitual correction brought into office
, T/F - At near, you should check to see if the patient can see better SC by bringing
material closer to the eyes - ANSWER true
What are the steps of testing VA at a distance? - ANSWER 1) present whole chart
(start with 20/50 to 20/15)
2) Cover OS (to test OD)
"read the smallest line of letter that you can read", then do OS and OU
T/F - Squinting allows better VA for myopes, hyperopes and astigmats - ANSWER
False! Just myopes and astigmats
T/F - If your patient is amblyopic, do not present the whole snellen chart - ANSWER
True! B/c it causes a crowding effect
only show a single line or single letter
What type of chart do you use when the patient cannot read 20/400 at a distance? -
ANSWER Low Vision Charts
or walk towards the chart
At how many feet away from the patient is a low vision chart used? - ANSWER at 10
feet away, using a bailey love or SOSH low vision chart
What do you record when using a low vision chart? - ANSWER the distance/smallest
line able to read
how do you translate low vision charts to s nellen? - ANSWER multiply by 2 each side
How do you record the acuity for a low vision patient that has to walk up to the chart? -
ANSWER Record the distance at which the pt was able to see the 20/400 for the first
time
ex) Using LV chart SOSH at 10 feet, patient was able to read the line marked 700
10/700 = 20/1,400
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller KenAli. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.24. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
81311 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now