Visual Acuity

Question 1

Minimum Detectable Resolution

Answer 1

how small can you see

Question 2

Minimum Separable Resolution

Answer 2

at what point can you distinguish 2 separate things

Question 3

Recognition Resolution

Answer 3

Smallest symbol/ letter able to be read

Question 4

Optotypes

Answer 4

targets on charts

Question 5

Visual Acuity

Answer 5

angular size of smallest target that can be resolved by patient

Question 6

Snellen VA

Answer 6

(test dist)/(distance where letters subtend 5 minarc)

Question 7

Unaided/ Uncorrected VA

Answer 7

no prescription help, done first

Question 8

Habitual VA

Answer 8

What patient normally wears

benchmark to determine benefit of changing refractive correction

Question 9

Corrected VA

Answer 9

best possible refractive correction
most relevant for ocular health assessment
medico-legal ramifications

Question 10

Pinhole Acuity

Answer 10

Increase depth of focus reduces blur due to refractive error or optical irregularities
shows if worse VA due to irregularities or disease