Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Clinical Optometry > Add determination > Flashcards

Add determination Flashcards

FCC/NRA &PRA/tentative add

1
Q

lead

A

over-accommodating (more than the stimulus) - focusing in front of the target

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

lag

A

under-accommodating (less than the stimulus demands) - focusing behind the target

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

normal accommodative posture

A

+0.50 lag

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

FCC

A

fused crossed cylinder test - test performed to measure accommodative posture AND determine tentative add

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

FCC procedure

A

target at 40 cm, +/- 0.50 D auxillary lenses, vertical lines or horizontal lines darker

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

FCC horizontal lines darker

A

Add +0.25 until reversal (binocular)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

FCC vertical lines darker

A

Add -0.25 until reversal (binocular) - stop after -1.00

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

positive FCC value

A

LAG

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

negative FCC value

A

LEAD

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

expected non-presbyope FCC

A

+0.50

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

expected presbyope FCC

A

approximately the patient ADD POWER

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Relative Accommodation

A

evaluation of ability to maintain a clear and single image when changing accommodative demand

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

NRA

A

negative relative accommodation - adding plus - relaxing accommodation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

PRA

A

positive relative accommodation - adding minus - stimulating accommodation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

expected NRA values for non-presbyopes

A

+2.00 +/- 0.50 D

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

expected PRA values for non-presbyopes

A

-2.37 +/- 1.00 D

17
Q

expected NRA/PRA values for presbyopes

A

balanced around ADD power (ex: NRA +2.00/PRA -2.00)

18
Q

Plus Build Up Modification

A

adding plus to the patients distance prescription to get to the point where the patient is seeing clear for their near demands

19
Q

Age Estimated Add

A

(Patient’s age - 35) x 0.1

20
Q

what NRA/PRA values wouldn’t make sense?

A

PRA greater than NRA (FCC is likely incorrect)

21
Q

During NRA, eyes are forced to

A

converge

22
Q

NRA indirectly measures

A

positive fusional vergence

23
Q

During PRA, eyes are forced to

A

diverge

24
Q

PRA indirectly measures

A

negative fusional vergence

25
Q

near triad

A

accommodation, meiosis, convergence

26
Q

FCC lighting

A

Dark/dim

Clinical Optometry (20 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions