Color Vision Testing with Children (M2) Flashcards
When does the child have Piaget-Seriation? 1. When do they have understanding of order (seriation)? 2
- 7 years or later
2. 5 year olds
For the Portnoy plate color vision testing, which plates should be used for a severe defect? 1. Minor defect? 2
- standard plates
2. desaturated plates
How is the X-Chrom lens administered to a patient? 1. What does the lens do? 2
- monocular
2. cuts out green
What is the presentation of mosaicism (lyonization)?
- sector defects
2. carriers have partial effects (color vision, RP, ocular albinism)
What are the three categories that all people need to be broken up into for color vision testing?
- color vision normal
- color safe defectives
- color unsafe defectives
Which test is harder for a color deficient person to pass: Farnsworth D-15 or Farnsworth Lantern?
Farnsworth Lantern
Which plate for HRR is difficult for even normal vision people?
plate 7
Why are protanomalous patients more affected than most deuteranomalous patients?
very little wavelength spread across “normal” MWS photopigments
What is the amount of colors that can be effectively recognized if you can do the Farnsworth D15? 1. Which colors are omitted? 2
- 7 colors
2. orange, brown, and purple
When are color groupings done in school more often (what age)?
age 5, 6, 7
What needs to be described when counseling the patient?
- describe defect
- stable
- NOT color blind but difficulty recognizing some colors
- longer reaction times
- color confusions
At what age do normal pseudoisochromatic plates and Farnsworth D-15 work well?
age 7
What are the color vision screening plates called?
pseudoisochromatic plates
What are the different types of plates used in HRR (along with plate numbers)?
- demonstration plates (1 to 4)
- screening plates (5 to 10)
- diagnostic series (11 to 20 and 21 to 24)
When is there some color vision processing during development?
3 months
What is the color vision test for infants?
Pease-Allen Preferential looking
What is the new thought on what deuteranomalous is really in people?
may lack MWS cone but have two versions of the LWS. If two are more wavelength spread out then more mild defect
When is there knowledge of 9 basic colors during development?
36 to 39 months
What percent of men have color vision defect? 1. What percentage of women are heterozygous for color vision defects? 2
- 8%
2. 14.76%
What are the color vision tests for ages 3 to 6?
- which different (Portnoy)
2. HRR (X, O, and Δ)
