Exam (elaborations)
CEVS Color Vision Exam Graded A+
- Course
- Institution
CEVS Color Vision Exam Graded A+
[Show more]
Content preview
CEVS: Color Vision Exam Graded A+- can discriminate differences of less than 2nm
-greater than 200,000 variants of color - ANS-what is the hue sensitivity of normal
patients
-bilateral
-stable (unaware/ no symptoms) - ANS-what are two characteristics of inherited color
vision defects
-can be used to monitor progression --you can get more sensitive info from color vision
vs VA
-can be early detector of a particular condition - ANS-what can acquired color vision
defect be used for
-can miss acquired defect
-doesnt do well on defining how severe or strong - ANS-downside of ishihara
-chloroquine
-digitalis, digitoxin, digoxin (heart medication) - ANS-what are the most important drug
toxicities that lead to B-Y defects
-deuteranomalous
-protanomalous
-tritanomalous - ANS-what are the different types of trichromats (3)
-difficulty matching colors of similar hue
-confusion of colors which are not similar - ANS-what does a color deficient patients
decreased sensitivity cause
-medium: deutan (green)
-long: protan (red) - ANS-in what cones are red green defects seen
-no red cones, only green and blue
-there is no red curve - ANS-what is characteristic about curves in proton dichromat
-saturation of spectrum occurs-perceived as "washed out"
-less sensitive of certain wavelengths - ANS-what are the two characteristics of color
deficient patients
-short: tritan (blue)
-medium: deutan (green)
-long: protan (red) - ANS-what are the different types of cones
-some have all 3 cones and something is wrong
, -some people only have two types of cones - ANS-why do the two different categories
of trichromats and dichromats exist
-tritanomalous
-tritanope - ANS-what are the two types of blue-yellow color vision defects (rare)
◦ Actual daylight‐too variable
◦ Incandescent light‐too much yellow; false negatives with
deutans - ANS-what is not an acceptable light source for color vision testing
◦ Determine cause
◦ Remove cause if possible and if benefit > risk
◦ Manage other related vision conditions
◦ Social/occupational counseling may be appropriate - ANS-how should you manage
someone with an acquired color defect that may be progressive
◦ inheritance unknown
◦ Variation of color blindness
◦ Only one cone type present
◦ Rods present also - ANS-what are four characteristics of cone monochromatism
◦ Inner retinas disorder but pt suffers from B‐Y defect: glaucoma, papilledema
◦ Outer retinal disorder but pt suffers from R‐G defect: Stargardt's - ANS-what are the
two exceptions to Kollner's rule
◦ Instruct patient to place caps in chromatic order
◦ no time limit (vs. 2 min allowed) and can rearrange ◦ Record on provided sheet and
score
◦ Re‐test - ANS-what is the procedure for the D15
◦ Normal patient sees; color deficient
patient does not - ANS-explain the vanishing figure color confusion test
◦ Post‐cataract surgery
◦ Ciprofloxacin
◦ sildenafil (Viagra) - ANS-what causes cyanopsia
◦ Social/occupational concerns: Can affect school/work performance
◦ Driving
◦ Career decisions
Genetic counseling : Explanation,
risks - ANS-how should you manage pt with inherited -stable color defect`
0.008% of M, FM
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 LUCKYSTAR2022. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $7.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79373 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now