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Dispensing Test 1

Panto/Retro/Ortho Tilt; Frame Size...etc

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