LV - Low Vision Exam II - Week 3 Flashcards
What is generally the normal difference between low and high contrast logMAR VA? What is considered abnormal?
2-3 lines is normal
Abnormal is 4 or more lines difference
What is the melbourne edge test?
Rows of circles with hemispheres of black or white and a background of grey
The contrast between these three colours decreases as you go down the chart
In what steps does contrast decrease in the melbourne edge test?
1dB
What is the working distance for the melbourne edge test?
40cm
Is the melbourne edge test done in light or dim conditions?
Light
What is the normal value for the melbourne edge test?
20dB
Note the abnormal melbourne edge test values for the following: Slight Moderate Severe Profound Near total
Slight - 18 to 15dB Moderate 14 to 11dB Severe 10 to 7dB Profound 6 to 3dB Near total 0 to 2dB
What does the melbourne edge test assess?
Peak contrast sensitivity
Desribe the pelli-robson chart. What does it assess?
16 triplets of same size letters
Contrast decreases from one triplet to the next
Last correctly identified triplet is recorded
Assesses peak contrast sensitivity
What are two supplementary tests for the low vision exam?
Binocular vision
Colour vision
List two tests that assess glare disability.
Mentor brightness acuity test
Berkeley glare acuity test
What are three other services that can be utilised for a case of low vision?
Occupational therapist
Orthoptist
Welfare officer
What are seven important considerations for the management of low vision patients?
- What were the patients needs and have they been met?
- Does the person understand their eye condition to the level that they wish?
- Will new glasses assist? If not explain why
- Will low vision aids assist? discuss use/limitations/cosmesis/cost
- Are their lighting/glare/eccentric viewing issues?
- What other services would assist?
- What will followup be?
