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If your first reading is -3.00, your second reading is -5.00, and your axis is 92 what is your power? (sph cyl x axis)
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This point is also called the major reference point. A.PRP B.NRP C.DRP D.Fitting Cross E.None of the above
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Optical lab

QuestionAnswer
If your first reading is -3.00, your second reading is -5.00, and your axis is 92 what is your power? (sph cyl x axis) -3.00 -2.00 x 092
This point is also called the major reference point. A.PRP B.NRP C.DRP D.Fitting Cross E.None of the above A.PRP
When laying out a segmented lens for blocking the ___________ is generally used to correctly position the lens...the MRP/ the OC/ the segment/ the PRP the segment
If the segment is below the midline of the frame the resulting calculation will be: negative number
If the segment is above the midline of the frame the resulting calculation will be: a positive number
If the segment is moved inward the resulting calculation will be a positive number
If the segment is moved outward the resulting calculation will be: negative number
A=56mm, B=42mm, DBL=18mm, Seg height=18mm, PD=63/60 ...What is the calculated distance decentration +5.5 in
A=56mm, B=42mm, DBL=18mm, Seg height=18mm, PD=63/60...What is the calculated total inset +7 in
What is the calculated seg drop or raise...A=56mm, B=42mm, DBL=18mm, Seg height=18mm, PD=63/60 -3 down
What is the calculated seg inset... A=56mm, B=42mm, DBL=18mm, Seg height=18mm, PD=63/60 +1.5 in
What is the calculated distance decentration...A=45mm, B=40mm, DBL=20mm, Seg height=15mm, PD=62/59 +1.5 in
What is the calculated seg inset...A=45mm, B=40mm, DBL=20mm, Seg height=15mm, PD=62/59 +1.5 in
What is the calculated total inset...A=45mm, B=40mm, DBL=20mm, Seg height=15mm, PD=62/59 +3 in
What is the calculated seg drop or raise...A=45mm, B=40mm, DBL=20mm, Seg height=15mm, PD=62/59 -5 down
When laying out a flat top lens, if the segment line is straight but the three spots are not then you have a lens that is__./incorrectly positioned on the layout marker/going /not decentered accurately/off axis off axis
The distance between the centers of the right and left segments is equal to the wearer's ___________...MRPs/Near PD/Distance PD/Intermediate PD Near PD
If the distance decentration is 4mm and the total inset is 6mm, what is the segment inset?...5mm/ 2mm/ 4mm/ not enough information given 2mm 2mm
This segment achieves the add power change by a change in curvature of the surface… One-piece/ Fused/ Multi-centric bifocals/ All glass bifocal lenses One-piece
The correct distance decentration can be checked at the same time the lens is positioned in the centration device. True / False True
Which of the following multifocal construction methods are only available in glass? One-piece Cemented Fused none of the above Fused
When using a lens protractor to layout and mark a lens for blocking the lens is generally placed (convex side up / concave side up) and when using a centration device the lens is generally placed (convex side up / concave side up). concave side up and convex side up
The intersection of the main horizontal and vertical lines on the lens protractor denotes the location of the: geometric center of the lens optical center of the lens major reference point of the lens boxing center of the frame boxing center of the frame
When laying out flat top trifocals, the top of the near segment is used for the seg drop or raise. True /False False
If everything in the centration process has been correctly flat top bifocals, round bifocals, and blended bifocals can be laid out for blocking using only the segment to position the lens. True/False False
Franklin style bifocals use the distance decentration point to decenter the lens and the segment line is used for vertical placement. True /False True
A standard double segment lens must use the upper segment for layout because this ensures there is enough seg depth in the upper segment. True /False False
A hand edger can be used for a variety of different tasks. What are the four main tasks associated with hand edging? • smoothing edge surfaces (edge smoothing) • remove sharp edges (safety/pin bevel) • reduce the lens size • reshape the lens
A hand edger is an abrasive wheel mounted so that the edges of a lens may be ground by hand. True False True
After edging you notice a white shredded wheat like plastic material around the edges of the lens. What is most likely the cause?...the lens is defective... the edger is malfunctioning.. the lens is polycarbonate.. the lens is high index pl the lens is polycarbonate
When the following sounds are heard during hand edging faulty technique is usually to blame. Fill in the blank with the faulty technique when these sounds are heard. 1. A wavy sound the angle of lens tilt is being altered
When the following sounds are heard during hand edging faulty technique is usually to blame. Fill in the blank with the faulty technique when these sounds are heard 2. Variations in sound volume pressure on the lens is uneven
When the following sounds are heard during hand edging faulty technique is usually to blame. Fill in the blank with the faulty technique when these sounds are heard. 3. Short, choppy sounds lens is being lifted from the wheel too often
When the following sounds are heard during hand edging faulty technique is usually to blame. Fill in the blank with the faulty technique when these sounds are heard. 4. A smooth sound interupted by periodic wavy sounds attempting to regrip the lens without lifting it from the wheel
Plastic lenses have a pin bevel that is a bit heavier than the pin bevels on glass lenses. True/false false
List the three primary reasons for pin beveling • Breakage prevention• Cosmetic considerations• Wearer safety
What does the term nasal cut refer to? Removing a portion of the nasal, usually in the lower half of the frame
What does the term nasal add refer to? Adding more lens area to the inferior portion of the nasal.
Created by: j1315
 

 



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