accommodation, vergence, oculom function

Question 1

what is the formula for minimum amplitude of accommodation?

what is considered a FAIL?

Answer 1

15-(1/4) age

2.0D or more below the average is FAIL

Question 2

range for negative relative accommodation

Answer 2

+2.00(+/- 0.50D)

Question 3

range for postive relative accomodation

Answer 3

-2.37(+/-)1.25D

Question 4

for MEM

define lag of accommodation
where does eyes focus?

Answer 4

lower than normal value

eyes focus behind the object

deep it… wont be able to focus up close.. think of presbyope..

Question 5

for MEM

define lead of accommodation
where does eyes focus?

Answer 5

higher than normal

eyes focus in front of object since it has more AA than required

Question 6

what is normal range for MEM?

Answer 6

pl to +0.75D

Question 7

what range is considered lag for MEM

Answer 7

Lag: > +0.75D

https://www.youtube.com/watch?v=7c3qOrHVqEk

Question 8

what range is considered lead for MEM

Answer 8

> -0.25D

Question 9

formula for AC/A ratio

Answer 9

PD (cm) +near dist(m) (near phoria -dist phoria)

exo carries (-) sign

Question 10

what type of exam findings will you get for accomodative insufficiency?

Answer 10

reduced amp. of accomm

lag on MEM

failed (-) MAF, BAF

reduced PRA, less than -1.50

Question 11

what symptoms are demonstrated by someone with accomm insuffic?

Answer 11

blurry vision up close

asthenopia

headache w/ near work

Question 12

what is the treatment for accomm insuff?

Answer 12

1. plus lenses
2. vision therapy to increase amps of accomm & facility

Question 13

define accommodative facility

Answer 13

it takes the patient a longer time to accommodate in response to a stimulus

Question 14

what are the exam findings for accomm infacility?

Answer 14

fail MAF and BAF (+ AND - lenses)

low PRA

low NRA

Question 15

what symptom does someone with accomm insuff have?

Answer 15

blurred distance with prolonged near work

Question 16

how to treat accomm insufficiency?

Answer 16

vision therapy to increase speed + ability to accommodate

plus lenses

Question 17

accommodative excess/spasm of accomm

Answer 17

accommodative response is more than the stimulus

Question 18

what are the exam findings for accommodative spasm/excess

Answer 18

lead on MEM

reduced MAF and BAF (fails +)

Question 19

how do you treat accommodative excess/spasm

Answer 19

plus powered lenses

vision therapy to relax accomm

rx cyclopegic drop

Question 22

define accommodative ill sustained

Answer 22

decreased response of accommodative system with time/fatigue/ repeated use

Question 24

On right head tilt, the superior limbus of each eye moves —
What torsional movement is this for the right eye? For the left eye?

Answer 24

Superior limbus of each eye moves left
The right eye - intorsion
The left eye - extorsion

Question 25

List EOM insertion to the limbus (closest to furthest)

Answer 25

MR, IR, LR, SR

Question 26

Define AC/A

Answer 26

Change in convergence due to change in accommodation

Question 27

grade B fusion (red lens test)

Answer 27

delayed fusion ## Footnote momentary diplopia then fusion

Question 28

category for normal response/instant fusion (red test)

Answer 28

Grade A

Question 29

constant double vision (no fusion at all)

Answer 29

Gr C

Question 30

when 1 eye is sppressed or the eyes alternately suppress resulting in perception of one light at a time

Answer 30

Gr D

Question 31

three degrees of fusion --highest to least in order

Answer 31

stereoacuity -3rd degr red lens test, Worth 4 dot-- 2nd degr

Question 33

formula for : vergence demand

Answer 33

demand: target separation in cm/training distance in meters ## Footnote variable tranaglyph. training divergence-- demand will be BI opposite for convergence

Question 34

a perfectly diffusing surface us one that

Answer 34

appears the same brightness when viewed from any angle. not shiny/glossy

Question 35

give an example of a specular surface

Answer 35

mirror ## Footnote surface is even and reflective OR glossy

Question 36

maddox rod modified thorington

Question 37

this methogolody uses prism to produce dissociation between the eyes

Answer 37

Von Graefe method