Eyes (1)

Question 1

Define Visual Acuity

Answer 1

ability to detect discontinuities and defects visually

Question 2

NRCan Visual Acuity requirements

Answer 2

• Near Vision Acuity
• Colour Vision acuity
• Distance Vision Acuity

Question 3

Describe the required near vision acuity

Answer 3

Jaeger number 2 at no less than 30cm

with one or both eyes, corrected or uncorrected

Question 4

Describe the required colour vision acuity

Answer 4

sufficient enough to distinguish contract between colours used in the NDT method

Question 5

Describe the required distance vision acuity

Answer 5

Snellen Fraction 20/30

with one or both eyes, corrected or uncorrected

Question 6

Parts of the Eye impacting MPI

Answer 6

rod and cone cells

Question 7

Rod Cells

Answer 7

• located around retina (macula)
• detect presence of light
• work best in dark conditions

Question 8

Cone Cells

Answer 8

• located around retina
• detect and differentiate colour
• work best in light conditions
• 3 types

Question 9

Eyes are best at detecting what colour in what light condition?

Answer 9

green-yellow fluorescent under darker conditions (M and L cones)

Question 10

As high intensity light increases our eyes increase their sensitivity to the ___ - ____ spectrum.

Answer 10

red-yellow

Question 11

As high intensity light decreases our eyes increase in sensitivity to ___ - ___ spectrum.

Answer 11

blue-green