W8 Lens Insertion, Rx Aligner, & Standard Alignment Flashcards
textbook mentions two methods for inserting lenses into plastic frames:
to insert the outer edge and the upper nasal portions of the lens in the frame and snap the
lower nasal into place
to insert the outer edge of the lens in the frame and snap the nasal edge into place
After a lens is inserted, they should be checked to ensure the lens is entirely in the groove of the eyewire. What should you look for?
ensure that any progressive 180 markings or segment tops are straight along the frames 180 line
ensure that the eyewire is flat and uniformly rounded on the outside
ensure there there is no nasal humping
ensure that the lens is not rotated
a pulling of the eyewire such that it covers less of the front of the lens bevel than back orvice versa.
rolled eyewire
Cellulose Acetate
Hot air
Nylon
Hot water
Carbon Fiber
No Heat
Polyamide
no heat
Polycarbonate
No Heat
Optyl
Hot air
Alternative Cellulose acetate
Hot salt or bead pan
Alternative Nylon
Hot air
Alternative Carbon fiber
hot air at low temp
Alternative Polyamide
No alternate method
Alternative Polycarb
No alternate method
Alternative Optyl
No alternate method
By plunging the heated frame into an ice water bath.
A cellulose acetate frame can be shrunk slightly to ensure a tight fit lens
used to ensure the frame curvature and the lens curvature match
eyewire-forming pliers
Vertical alignment or four-point touch is done using
Ruler
During standard alignment, a frames open temple angle should be between …
90-95 degrees
Functions of lens aligner
to measure binocular PD of a mounted pair
to measure monocular PD of a mounted pair
to measure height of mounted lenses
to measure the near PD of a mounted segmented pair
to examine the 180 alignment of a mounted multifocal lens
Other names for lens aligner
Rx aligner
prescription aligner
seg aligner
