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CEVS Color Vision Exam Graded A+
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CEVS Color Vision Exam Graded A+
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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
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