Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Dispensing Test 1
Panto/Retro/Ortho Tilt; Frame Size...etc
| Question | Answer |
|---|---|
| What is spherical equivalent? | spherical approximate of a cylinder RX; SE = sphere + 1/2cylinder |
| What is the pantoscopic tilt? | The tilt of the frame front in front of the patient's eyes. |
| What is retroscopic tilt? | Bottom of the frame-front is out further than the top of frame-front. |
| What is the pantoscopic angle? | Number of degrees between the frame-front and Listing's Plane |
| If you decrease retro you ________ panto? | increase |
| The average frame pantoscopic angle is...? | 10 degrees |
| Why do we want pantoscopic tilt? | visual axis is hitting the optical center at 90 degrees more often; looks better; when using panto you are raising or lowering the effective optical center |
| If you increase pantoscopic tilt (decrease retro) you _____ the EOC? | raise |
| If you decrease pantoscopic tilt (increase retro) you ________ the EOC? | lower |
| For every two degrees change in panto the EOC moves how many mm? | One |
| We like to have the patient looking through the frame EW about __ mm above the datum line? | 5 |
| What is orthoscopic tilt? | No pantoscopic tilt; frame front is straight up and down |
| When sizing frames you start at the...? | bridge |
| How is the bridge size determined? | By the vertical position of the frame on the patient's face. |
| What is the VDC? | A measurement used to determine correct bridge size; the distance from the bottom of the lens to the pupil center, when the eye is in the primary position; VDC = 1/2 B + 5 |
| How do you know if you have the correct eye size? | Temples go straight back to the patient's ears; form a 90 degree angle to the frame when viewed form above |
| As the power of lens increases so does the _________? | thickness |
| For higher powers you should choose a _______ eye size. | smaller; choose a frame with extended endpiece |
| What two factors can effect eye size? | Rx power and patient's PD |
| What are different temple styles? | Skull, Library, Convertible, Comfort Cable, Riding Bow; Relaxo (look at notes for drawings and descriptions) |
| How do you know if you have the correct skull temple size? | bend should occur at the top of the ear; earpiece should be 1 1/4 to 1 1/2 inches long. |
| How do you know if you have the correct cable temple size? | Cable length = skull + 3/4 inch |
| 150 mm = __ inches | 6 |
| 5 mm = __ | 1/4 inch |
Created by:
griffiskr
Popular Medical sets