NRA/PRA/BAF/MAF

Question 1

relative accommodation

Answer 1

ability to sustain fusion and clarity under varying accommodative conditions

Question 2

tentative add (using NRA/PRA)

Answer 2

FCC + ((NRA +PRA)/2)

Question 3

Negative Relative Accommodation

Answer 3

adding plus (think negative= relaxing accommodation)

Question 4

Positive Relative accommodation

Answer 4

adding minus (think positive=stimulating accommodation)

Question 5

PRA indirectly measures

Answer 5

NFV (divergence)

because accommodation is stimulated and converged eyes must try to diverge to maintain clear single image

Question 6

NRA indirectly measures

Answer 6

PFV (convergence)

because accommodation is relaxed and diverged eyes must try to diverge to maintain clear single image

Question 7

Is NRA or PRA performed first

Answer 7

NRA

Question 8

when is NRA/PRA performed

Answer 8

immediately before minus lens amps (non-presbyopes) OR during add-determination

Question 9

NRA/PRA purpose

Answer 9

to determine accommodative ability under binocular conditions
“range of focusing system”

Question 10

NRA/PRA starting point

Answer 10

habitual rx (non-presbyopes) or tentative add (presbyopes)

Question 11

NRA/PRA target

Answer 11

“read these words letter by letter” or 2 lines above BCVA of poorer seeing eye if not 20/20

Question 12

why would a patient see a target after a PRA greater than -3.00 D?

Answer 12

most likely suppressing (per NBEO)

Question 13

Expected NRA results

Answer 13

+2.00 (+/-0.50) D

+1.50 - +2.50

Question 14

Expected PRA results

Answer 14

• 2.37 (+/-1.00)D

- 1.37 - -3.37

Question 15

binocular accommodative facility

Answer 15

measures the interaction between accommodation and vergence

Question 16

monocular accommodative facility

Answer 16

measures only accommodative facility

Question 17

accommodative facility

Answer 17

to evaluate the stamina and dynamics of the accommodative response when switching between plus and minus lenses
“flexibility of your focusing system”

Question 18

accommodative infacility

Answer 18

sluggish or difficult accommodative response to change in stimulus of fixation distance

Question 19

accommodative facility target

Answer 19

20/40 single letter rock card at 40 cm, polaroid strips vertical over card for binocular

Question 20

how long do you test accommodative facility for?

Answer 20

60s

Question 21

things to note/record during BAF

Answer 21

cycles completed; plus or minus more difficult; any suppression/diplopia
ex: 6 cpm, (-) more difficult

Question 22

1 cycle in BAF/MAF

Answer 22

2 boxes (cleared 1 plus and 1 minus)

Question 23

expected adult BAF results

Answer 23

10 cpm

Question 24

expected child BAF results

Answer 24

5 cpm

Question 25

expected adult MAF results

Answer 25

11 cpm

Question 26

expected child MAF results

Answer 26

7 cpm

Question 27

fails BAF & MAF, (+) more difficult

Answer 27

trouble relaxing accommodation

Question 28

fails BAF & MAF, (-) more difficult

Answer 28

trouble stimulating accommodation

Question 29

fails BAF but passes MAF, (+) more difficult

Answer 29

trouble with convergence

Question 30

fails BAF but passes MAF, (-) more difficult

Answer 30

trouble with divergence

Question 31

high NRA vergence problem

Answer 31

eso deviation

Question 32

low NRA vergence problem

Answer 32

exo deviation

Question 33

high PRA vergence problem

Answer 33

exo deviation

Question 34

low PRA vergence problem

Answer 34

eso deviation