4 - Plastic Frame Alignment, Heating, & Lens Insertion Flashcards
What is standard alignment/truing a frame?
Standard alignment is when the frame is set up in a standard way that is impersonal and ready to be manipulated and adjusted to the patient’s face.
What are the 6 parts to standard alignment? (in order)
1)Horizontal Alignment
2)Vertical Alignment
3)Open temple Alignment
4)Temple Parallelism
5)Alignment of the Bent Down Portion of the Temple
6)Temple Fold Angle
What are two ways to heat frames?
Forced hot air
Hot salt/glass bead pan
What are 3 steps to heating frames with forced air?
1) Heat only area you are working on
2) Rotate so evenly heated
3) Know + Check the frame material
What are 4 steps to heating frames with salt or beads?
1)Know + Check the frame material. If not use hot air
2) Stir salt/glass beads
3)Keep frame parallel to the surface of the salt/beads while heating
4)Move the frame slowly while in the salt/beads
5)Heat only area you are working on
What are the 4 steps to Method #1 Lens insertion?
1) Heat and curve top of frame to match the lens top
2)Heat eyewire of the frame
3) Place the outer part of the lens in the outer part of the frame
4)Push the inner edge of the lens in with your thumbs.
What are the 5 steps to Method #2 Lens insertion?
1) Heat and curve top of frame to match the lens top
2)Heat eyewire of the frame
3) Place the outer part of the lens in the outer part of the frame
4)Place the upper inner edge of the lens in the frame.
5) Pull the lower eye wire around the lens begin at temple go nasally
What is standard alignment also known as?
Truing a frame
What are the 3 steps to check the horizontal alignment of a plastic frame? see diagram in powerpoint
1)Place a ruler across
the back of the frame
at the top of the pads,
if any.
2)If there are no pads,
there may be a point
where the sculptured
shaping of the bridge
areas ends.
3)Both endpieces should
be equidistant from
the straight edge
when it is aligned
horizontally
What are the two things you check for in horizontal alignment?
Rotated lens
Skewed bridge
How do you adjust a plastic frame to fix horizontal alignment issues 3 steps?
1) Heat plastic first
2)Once warm, gently bend the frame in desired direction
3)Bend beyond the point that you want it to stay and hold it there until it cools.
How do you check for vertical alignment? see diagram in point
Place a ruler against the nasal side of the eye wire by performing a 4 point touch.
What is face form + negative face form?
When frame curves inwards at the bridge to form to the faces natural curve - face form
When the frame is bent outwards at the bridge opposite to face form - negative face form
How do you fix negative face form?
1)warm the bridge
first
2)grasp the frame by the
lenses and eyewire
with thumbs on
the inside and
bend the frame.
3)Move the desired amount
What is x - ing?
The frame front may
be twisted so that the
two lenses are out of
coincidence with each
other.
What is checked for in vertical alignment? 3
x-ing
face form
Variant/vertical planes
What needs to be adjusted first when addressing glasses out of alignment
The bridge
The x-ing
How do you know if they are in variant plane? see diagram in powerpoint
The lenses are in
not in the same plane or variant alignment.
When the lenses are in variant planes how can the lenses and bridge appear?
Lenses can appear parallel
Bridge can appear in a wavy or S shape (see diagram in powerpoint)
What is the Open Temple Spread?
The angle that each open temples forms in relationship with the front of the frame
What is the angle of a normal temple spread?
94-95 degrees
Review 5 methods of adjustment if temples are spread too far
SEE TABLE 8.1 PAGE 109 SOD
Review 4 methods of adjustments if temples are not spread enough
SEE TABLE 8.1 109 SOD
How do you check for Temple Parallelism?
Do a flat surface touch test - place the glasses upside down on a flat surface
What should you see when you do a flat surface touch test?
4 points of the frame should touch a flat surface. see diagram
What are the 4 steps if the temple parallelism is not equal?
1)check for a bent endpiece
2)check for loose or broken rivets or loose hidden hinge
3)check for bend in the temple shaft
4) if none of the above is wrong, hinge needs to be bent
When looking at the alignment of the bent down portion of the temples what are we checking? 2
1) Check for equality in the downward bend.
2) Check for equality of the inward bend.
When checking the temple fold angle what do we do/look at?
Fold temples to closed position and observe angle formed at the temples cross.
What are two methods to adjust the temple fold angle?
1) Use of Angling Pliers
2) Use of Finger-Piece Pliers
What should the temple fold angle look like? 2
Temples should be parallel to one another or form slight angles from parallel.
Angles should be symmetrical and cross at exactly centre of the frame inline with the centre of the bridge.
What is step 1 of standard alignment/truing a frame? and what are we checking for? 2
Horizontal bridge alignment
-rotated lens
-skewed bridge
What is step 2 of standard alignment/truing a frame? and what are we checking for? 3
Vertical bridge alignment (4-point touch)
-x-ing
-variant planes
-face form
What is step 3 of standard alignment/truing a frame? and what are we checking for? 2
Open temple Alignment
-temple straightness of shaft
-temple angle when open for symmetry
What is step 4 of standard alignment/truing a frame? and what are we checking for? 4
Temple Parallelism (flat surface test)
-Bent end piece
-Loose hinge
- Bend in the temple shaft
-If none above apply bend the hinge
What is step 5 of standard alignment/truing a frame? and what are we checking for? 2
Alignment of the bent-down portion of the temple
-equality of downward bend
-equality of inward bend
What is step 6 of standard alignment/truing a frame? and what are we checking for? 2
Temple-fold angle
-central crossing of the temple shafts when folded
-Fold that permits the insertion of the spectacle into a standard case
