unit 6

Question 1

what is in a GP fitting kit

Answer 1

-set of lenses
-single or multiple diameters
-same BVP for each lens
-BOZR in 0.1mm steps (change in 0.05mm results in 0.25D change)

Question 2

how would you fit someone with smaller eyelids

Answer 2

smaller diameter and a steeper base curve

Question 3

easy ways to take diameter?

Answer 3

take the HVID and subtract is by 2

Question 4

how would we fit a px with lid attachement

Answer 4

we can fit them with an alignment fit based on their flat k

Question 5

corneal astigmatism of 0.75 what would the suggested BOZR be?

Answer 5

fit on flat K

Question 6

corneal astig of 0.75 to 1.00 , what would the suggested BOZR be

Answer 6

fit on flat K or 0.25D steeper than flat k

Question 7

corneal asitg of 1 to 2.50 what would be the suggested BOZR

Answer 7

fit 0.25 to 0.50 steeper than flat k

Question 8

corneal astig of more than 2.50 what would the suggested BOZR be

Answer 8

back surface toric recommended

Question 9

WTR astigmatism

Answer 9

flatter curvature in horizontal meridian
no tears in horizontal meridian, verticle meridian has tear lens

Question 10

ATR astigmatism

Answer 10

flatter curvature in verticle meridan
no tear lens in verticle meridian, horizontal meridian has tear lens

Question 11

what to use on RGP before inserting

Answer 11

-boston simplus or conditioning solution
-wet lens thoroughly
-soack lens for 24 hours - new lenses

Question 12

is digital imaging cost minimal or expensive

Answer 12

it is minimal once you have it set up.

Question 13

digital imaging ? images are better then sketches in chart notes T OR F?

Answer 13

TRUE

Question 14

7 exmaples of digital imaging?

Answer 14

1. digital SLR camera slit lamp imaging system
2. Smartphone digital imaging
3. video slit lamp imaging system
4. infared imaging (used for mibomian gland dysfunction)
5. OCT anterior segment (good for scleral fitting)
6. scanning slit beam tomography
7. confocal microscopy

Question 15

what is the average OAD/OZD

Answer 15

9.4 / 8.0 MM

Question 16

when you increase the diameter by 0.5mm what do you do to BOZR

Answer 16

you will need to flatten BOZR by 0.25D

Question 17

when you decrease the diameter by 0.05mm what do you do to BOZR?

Answer 17

You will need to steepen the BOZR by 0.25D

Question 18

When you increase the diameter what does it increase?

Answer 18

it increases the sag depth

Question 19

when increasing sag depth what fit does this result in?

Answer 19

a tighter fit

Question 20

when you decrease the sag depth what does this do to the fit?

Answer 20

it will loosen the fit

Question 21

T OR F - when you change the diameter of the lens it doesnt change the power of the lens but when you change the curvature of the lens this will change the power

Answer 21

TRUE

Question 22

How to fix a continually high, not dropping after blink lens

Answer 22

-steepen periphery
-narrow periphery
-reduce TD
-reduce thickness

Question 23

when lens is continually low/rapid drop after blink how do you fix

Answer 23

increase TD
reduce TC
add peripheral negative carrier

Question 24

if lens is continually to one side how to fix it

Answer 24

increase TD
soft lens
steepen design
back surface toric design

Question 25

if GP has poor comfort how do you fix it

Answer 25

tighten fit
reduce edge clearnece
thinner edge
remove and replace lens
modify fit
consider an aspheric or toric design
increase TD
change matieral

Question 26

if you have poor vision with GP what do you do

Answer 26

refract and change power
asses fit and modify
toric lens
flatten fit
change material
clean lens

Question 27

when you increase BOZR what does it do to the lens (mm)

Answer 27

flatten the lens

Question 28

when decreasing BOZR what does it do to lens (mm)

Answer 28

will steepen lens

Question 29

what is dimple veiling?

Answer 29

deformation of the corneal epithelium caused by trapped smalled air bubbled during CL wear // this does go away

Question 30

how many mm of a ring do you want to see along an alignemnt GP lens

Answer 30

0.5mm ring