Panto/Retro/Ortho Tilt; Frame Size...etc
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each of the black spaces below before clicking
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Help!
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| What is spherical equivalent? | spherical approximate of a cylinder RX; SE = sphere + 1/2cylinder
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| What is the pantoscopic tilt? | The tilt of the frame front in front of the patient's eyes.
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| What is retroscopic tilt? | Bottom of the frame-front is out further than the top of frame-front.
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| What is the pantoscopic angle? | Number of degrees between the frame-front and Listing's Plane
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| If you decrease retro you ________ panto? | increase
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| The average frame pantoscopic angle is...? | 10 degrees
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| 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
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| If you increase pantoscopic tilt (decrease retro) you _____ the EOC? | raise
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| If you decrease pantoscopic tilt (increase retro) you ________ the EOC? | lower
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| For every two degrees change in panto the EOC moves how many mm? | One
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| We like to have the patient looking through the frame EW about __ mm above the datum line? | 5
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| What is orthoscopic tilt? | No pantoscopic tilt; frame front is straight up and down
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| When sizing frames you start at the...? | bridge
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| How is the bridge size determined? | By the vertical position of the frame on the patient's face.
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| 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
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| 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
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| As the power of lens increases so does the _________? | thickness
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| For higher powers you should choose a _______ eye size. | smaller; choose a frame with extended endpiece
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| What two factors can effect eye size? | Rx power and patient's PD
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| What are different temple styles? | Skull, Library, Convertible, Comfort Cable, Riding Bow; Relaxo (look at notes for drawings and descriptions)
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| 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.
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| How do you know if you have the correct cable temple size? | Cable length = skull + 3/4 inch
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| 150 mm = __ inches | 6
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| 5 mm = __ | 1/4 inch
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