Cram time Flashcards
1
Q
What is the FOV with a 78D lens
A
81/97 degrees
2
Q
What is the magnification of a 78D lens
A
0.93x
3
Q
What is the WD for a 78D lens
A
8mm
4
Q
FOV of a 90D ?
A
74/89 degrees
5
Q
Image magnification of 90D?
A
0.76x
6
Q
Working distance of 90D?
A
7mm
7
Q
Super Vitreousfundus FOV?
A
103/124 degrees
8
Q
Image magnification of Super Vitreousfundus?
A
0.57x
9
Q
working distance of Super Vitreousfundus?
A
4-5mm
10
Q
Superfield NC FOV?
A
95/116 degrees
11
Q
Superfield NC mag?
A
0.76x
12
Q
Superfield working distance?
A
7mm
13
Q
Superpupil XL FOV?
A
103/124 degrees
14
Q
Superpupil XL mag?
A
0.45x
15
Q
Superpupil XL working distance?
A
4mm
16
Q
Digital high mag FOV?
A
57/70 degrees
17
Q
Digital high mag, image magnification?
A
1.30x
18
Q
Digital high mag WD?
A
13mm
19
Q
Digital wide field FOV?
A
103/124 degrees
20
Q
Digital Wide Field mag?
A
0.72x
21
Q
Digital Wide Field WD?
A
4-5mm
22
Q
The distance from the point where the screw intersects with the horizontal axis of the temple to the tip of the temple, measured along the temple axis is called?
A
temple length
23
Q
The distance from the point where the screw intersects with the horizontal axis of the temple to the centre of the bend is called?
A
length to bend
24
Q
The distance between the inside of the temples at the base of the fitting triangle is called?
A
Temple width
25
The angle formed by the temples and the frame front is called?
Pantoscopic tilt
26
What is the difference between pantoscopic tilt and retroscopic tilt?
For pantoscopic tilt the lens bottom is rotated towards the cheeks. For retroscopic tilt the lens bottom is rotated away from the cheeks
27
The angle between the temples and the frame front is called? What is the ideal angle for a standard aligned frame?
let-back
| 95 degrees
28
The angle formed by a line parallel to the rim of the frame where it rests on the nose and the perpendicular line dividing the nose in two, viewed from directly in FRONT ?
Frontal angle
29
The angle formed by a line parallel to the rim of the frame where it rests on the nose and perpendicular line dividing the nose in two, viewed from ABOVE?
Splay
30
The surface at the apex of the bridge which sits on the top of the nose? This is only of interest in what situation?
- crest
| - plastic frames and comfort bridges where the crest is in contact with the nose
31
The angle formed by a line parallel to the inside surface of the apex of the bridge where it rests on the nose and a line parallel to the front of the face (viewed from the side)
crest angle
32
Whether the crest angle matches the wearer's nose also depends on what other frame parameter?
pantoscopic tilt
33
The distance from the horizontal centre line to the crest of the frame?
crest height
34
The frame position predetermined by the manufacturer is known as?
standard alignment
35
What two important alignment errors are there to assess in the plane or levelness of the lenses to each other?
X-ing and coplanar alignment
36
When the bridge is twisted, causing the eye-wires of the frame front to form an X when you look at the frame from the side, this is called?
X-ing
37
If the lenses planes are parallel but one lens is further forward than the other, it is said that the lenses are not _____
coplanar
38
Temple-fold angles should be same and closely parallel for what two reasons?
1. to fit easily into a spectacle case
| 2. the side that doesn't hang down may rub on the inside surface of the lens
39
In the boxing system, the width of the box is what measurement of the frame? This is often referred to as the ____ dimension.
eye size
| A dimension
40
The distance between the top and bottom lines of the box (in the boxing system) is the ______ ______ and is also known as the ___ dimenstion
frame depth
| B
41
in the datum system, the length of the datum line between the peak of the bevel at the temple end and the peak of the bevel at the nasal end is?
eyesize
42
The boxing system generally gives a larger ____ and a smaller _______ than the datum system
1. eyesize
| 2. bridge size
43
What is the most significant facial difference between an adult and young children to consider for frame selection?
do not have a developed nose
44
What are the characteristics of a good kid's frame? (5)
- lower crest
- larger frontal angle
- larger splay
- flatter pantoscopic tilt
- ability to shorten temples
45
What is the minimum edge thickness for a supra frame?
2.2mm
46
What is the tolerance of the cyl component in this Rx (for SV or MF lenses)? -3.00/-1.50 x 180
+/-0.09
47
What is the tolerance for sphere values from 0 to +/-9.00 for SV or MF lenses?
+/-0.12
48
For all scripts excluding 0 to +/-3.00DS with >0.75 to ≤4.00 cyl, what is the tolerance for cyl values (for SV or MF lenses)
+/-0.12
49
For progs and degressive lenses the tolerance for sphere 0.00 to +/-6.00 and/or 0.00 to ≤0.75 cyl is?
+/-0.12
50
For progs and degressive lenses (other than under the category of 0 to +/-6.00 with 0.00 to ≤0.75 cyl) the tolerance for both sphere and cyl is?
+/-0.18
51
Tolerance for axis for cyl power up to 0.25DC?
+/-16
52
Tolerance for axis for cyl power from OVER 0.25 to ≤0.50
+/-9
53
Tolerance for axis for cyl power OVER 0.50 to ≤0.75
+/-6
54
Tolerance for axis for cyl power OVER 0.75 to ≤1.50
+/-4
55
Tolerance for axis for cyl power OVER 1.50 to ≤2.50
+/-3
56
Tolerance for axis for cyl power OVER 2.50?
+/-2
57
What is the formula for MSU?
MSU (mm) = ED + (2 x monocular decentration)
58
In P = cF, what is the unit for c?
cm
59
In the edge thickness formula, what is y?
half the ED (mm)
60
How many points are there in a 24-2 FDT full threshold test for a Humphrey Matrix Field Analyser?
55
61
How many points are there in a 30-2 FDT full threshold test for a Humphrey Matrix Field Analyser?
69
62
The N-30-5 and N-30-1 Screening FDT tests have how many points?
19
63
The 24-2-5 and 24-2-1 Screening FDT tests have how many points?
55
64
For the Medmont "Full field test" (50 degrees) how many points are there?
164
65
How many points are there for the Medmont Central test? (30 degrees)
100
66
What is the pantoscopic tilt recommended for progressive lenses?
10-12 degrees
67
Fat top standard height is __ to __mm below the ___?
0 to 2mm
| below the top of the lower eyelid
68
Trifocal flat-top standard height is __mm below the ___?
2mm
| below the bottom of the pupil
69
Frame selection for bifocal or trifocal should have at least ___mm between the segment top and the bottom of the frame?
15mm
70
which type of specially worked lens is fitted using the centre of rotation rule (the same as SV)
anti-fatigue lenses
