ANSI

Question 1

occupation and glasses

Answer 1

it is important to know the patients occupation when fitting them for glasses

Question 2

normal pantoscopic tilt

Answer 2

7 degrees

Question 3

how does panto change glasses Rx

Answer 3

its rotated around 180 degrees

• induces minus cyl at 180
• induced plus cyl at 180

Question 4

how does faceform change glasses RX

Answer 4

lens tilted around the 90 axis

• induces minus cyl at 90
• induces plus cyl at 90

Question 5

how does panto affect the sphere component of glassed

Answer 5

increase the plus and the minus sphere

Question 6

panto and PALs

Answer 6

patients who wear PALs benefit from panto because it moves the reading portion of the lens closer to the eye, which increased the reading width of the lens

Question 7

how much does the OC lower when there is added panto

Answer 7

for every 2 degrees of panto, the OC is lowered 1mm

Question 8

panto and lens distortion

Answer 8

will typically increase and alter the cylindrical effect

Question 9

how to induce panto

Answer 9

adjusting the angle of the temple

Question 10

retroscopoc tilt

Answer 10

causes the top of the lens to be close to the face

Question 11

pantoscopic tilt is helpful if the optical center of the lens is too ____

Answer 11

high

Question 12

ANSI standard for horizontal prism

Answer 12

2/3 amount prism

Question 13

ANSI standard for vertical prism

Answer 13

1/3 amount of the prism

Question 14

ANSI : sphere -6.50 to +6.50

Answer 14

+/- 0.13

Question 15

ANSI: sphere >+/-6.50

Answer 15

+/- 2% sphere power

Question 16

ANSI: cyl <2.00D

Answer 16

+/-0.13

Question 17

ANSI: cyl 2.00-4.50D

Answer 17

+/- 0.15

Question 18

ANSI: cyl >4.50D

Answer 18

4% of cyl power

Question 19

ANSI: cyl axis 0.25 or less

Answer 19

+/-14

Question 20

ANSI: cyl axis >0/25-0.50

Answer 20

+/-7

Question 21

ANSI: cyl axis >0.50-0.75

Answer 21

+/-5

Question 22

ANSI: cyl axis 0.75-1.50

Answer 22

+/-3

Question 23

ANSI: cyl; axis 1.50

Answer 23

+/-2

Question 24

how to lower the height of the bifocal segment

Answer 24

the glasses need to be lowered on the patients face

increase the distance between the nosepads
raise the vertical portion of the nosepads
widen the bridge of the frame

Question 25

glasses falling down face

Answer 25

pull in temple bend down temple tips pull in nosepads to tighten the fit

Question 26

one lens feels closer to the face than the other lens

Answer 26

straighten the temples

Question 27

glasses touching cheeks

Answer 27

reduce panto narrow bridge or nosepads to raise frame narrow bridge or nosepads to increase vertex distance

Question 28

glasses to close to face

Answer 28

narrow the nosepads, shrink the bridge, or decrease faceform to move lenses away from face

Question 29

frames sit sit too low on the face

Answer 29

narrow the bridge, add nosepads, or lower vertical position of pads to move frames up on face

Question 30

if the frame is too high on one side

Answer 30

bend temples toward the problem

Question 31

if the segment is too high

Answer 31

``` increased panto decrease the vertex distance spread the nosepads move the nosepads up by adjusting the notepad arms stretch the bridge ```

Question 32

if the segment is too low

Answer 32

``` narrow the nosepads move the nosepads down by adjusting the notepad arms increase the vertex distance reduce panto tilt shrink the bridge ```

Question 33

abbe value and aberration

Answer 33

increased abbe value=decreased aberration

Question 34

abbe value of diff lens materials

Answer 34

``` crown:58.9 CR-39: 58 Trivex: 44 high index: 40 polycarbonate: 30 ```

Question 35

pros of crown glass

Answer 35

does not scratch

Question 36

cons of crown glass

Answer 36

heavy, shatters

Question 37

pros of CR-39

Answer 37

light

Question 38

cons of CR39

Answer 38

scratches easily

Question 39

pros of polycarbonate

Answer 39

safety

Question 40

cons of polycarbonate

Answer 40

high chomratic aberration, scratches

Question 41

pros of high index

Answer 41

very thin and light

Question 42

cons of high index

Answer 42

high chromatic aberrations, scratches

Question 43

pros of trivex

Answer 43

safety, less chromatic aberration

Question 44

cons of trivex

Answer 44

thicker than poly, more expensive

Question 45

what powers need aspheric lenses

Answer 45

-23 and higher | +7 and higher

Question 46

best frames and lenses for high myopia

Answer 46

- small eye and larger bridge - round shape frame - high index lenses - roll and polish lens edges - aspheric lenses

Question 47

best frames and lenses for high hyperopia/aphakia

Answer 47

- small eye size (induced prism if too large) - round shape frmae - high index lenses - cable temples - apsheric lenses

Question 48

Best frame and lens options for PALs

Answer 48

- adequate panto tilt - adequate vertical depth and nasal portion - minimal vertex distance

Question 49

best frames and lenses for kids

Answer 49

- polycarb lenses for safety - sturdy frame - consider transitions - eye protection for sports - spring temples - no rimless frames

Question 50

safety regulations of lenses

Answer 50

Z87 - 5/8 inch diameter steel ball dropped from 50" - safety glasses: the steel ball is increased to 1" diameter for testing from the same distance - the marking for safety lenses is Z87 - RX lenses must have a minimum thickness of 3mm, except for plus lenses >3D

Question 51

who should get polycarbonate lenses

Answer 51

all children, monocular patients, and patients using glasses for safety or sports

Question 52

double D bifocal

Answer 52

lined bifocal at the bottom of the lens and at the top of the lens. it is an occupational lens that is most often RXed for patients who perform detailed work above their line of sight, such as electricians and auto mechanics