Quiz 6 Flashcards
The two ways a prism must be expressed in relationship to a prescription are:
Prism Dioptric Power
Base Direction
For the following, calculate the amount of image jump the client will experience:
FT 25 bifocal, Add: +2.50
Image Jump=
1.25 prism diopters
Excessive prism base up will cause the client to see: (select the correct response)
the floor appears convex
the floor appears concave
vertical objects as being taller than they are
all of the above
the floor appears convex
Transcribe the following RX into an intermediate prescription:
OD: +3.25 - 0.50 x 35
OS: +1.50 - 1.50 x 170
Add: +2.75 o.u.
Intermediate RX: ?
OD: +4.62 -0.50 x 35
OS: + 2.87 -1.50 x 170
Identify the following diagrammed lense by name:
Flat Top
Identify the following diagrammed lense by name:
Ultex A
Which type of bifocal has the least image jump?
(select the correct response)
FT 25
Round 22
Ultex A
Executive
Executive: it has 0
FT is 5, Round 22 would have 11, and Ultex A has 19
Image jump of a bifocal add causes the image to jump:
up
Which type of bifocal has the greatest thickness?
(select the correct response)
FT 25
Round 22
Ultex A
Executive
executive
Prism base 45 degrees before the right eye is the same as prism base:
up and out
up and in
down and out
down and in
cannot be determined
up and in
Identify the following diagrammed lense by name:
Executive
Identify the following diagrammed lense by name:
Round Seg
When light strikes a prism, it will deviate toward the ________________ while the image will be displaced toward the ______________.
When light strikes a prism, it will deviate toward the Base while the image will be displaced toward the Apex.
Excessive prism base down will cause the client to see:
(select the correct response)
the floor appears as if concave
as if they are standing in a hole and walking uphill
vertical objects as being taller than they are
all of the above
all of the above
For the following, calculate the amount of image jump the client will experience:
Round 28 bifocal, Add: +1.50
Image Jump=
2.1 prism diopters
Identify the following diagrammed lense by name:
Ribbon Seg
Write the TRP from the following RX:
OD: +1.00 - 1.00 x 90
OS: +1.25 -0.75 x 65
Add: +2.50 o.u.
TRP: ?
OD: +3.50 -1.00 x 90
OS: +3.75 -0.75 x 65
The direction of the base direction for prisms is expressed in degrees from:
0-360
For the following, calculate the amount of image jump the client will experience:
Executive bifocal, Add: +1.75
Image Jump=
0
For the following, calculate the amount of image jump the client will experience:
Ultex A bifocal, Add: +2.00
Image Jump=
3.8 prism diopters
Resolve the following prism (Find X and Y components):
OD: -3.00 -1.00 x 30 (combined) 5.00 prism diopters @200
X = 4.7^ BO Y = 1.7^ BD
x = R (cos)(angle)
y = R (sin)(angle)
Find the resultant prism (R and degree) from the following information:
OS: +1.00 -2.00 x170 (combined) 2.00 prism diopters BI and 3.00 prism diopters BU
3.6 prism diopters at 124 degrees
r = square root of [x(squared) + y(squared)]
x=2 y=3
r= 3.6 prism diopters
theta = tan-1 (y/x)
theta = 56.309 degrees
180-56.309 =
theta = 123.69 degrees
Identify the following diagrammed lense by name:
Double D lens
Which type of bifocal has the most image jump?
(select the correct answer)
FT 25
Round 22
Ultex A
Executive
Ultex A (19)
FT is only 5, Round 22 is only 11, and Executive is 0
respectively the lowest mm for d the lowest Image Jump
The 2nd quadrant, in reference to meridian notation, has degrees ranging from:
90 - 180
