Chapter 19 II Flashcards
Describe Franklin-style segments
One piece lens with the segment extending the full width of the lens
The thickness of the executive lens is dependent on
The near power than the distant power
Where is the optical center on the executive lens
On the segment line
What should be avoided for executive lenses
Large eye sizes and large effective diameters
What are a better alternative to executive lenses for someone desiring a large bifocal reading
Large flat tops
Trifocals with 8mm+ depth are better for
Occupational situations father than all time-wear lens
Describe E/D trifocals:
- executive type plus flat top D lens
- full, wide line across the lens dividing distance and intermediate portion
- flat top segment placed in the lower, intermediate powered portion
Occupational multifocals are certain lens styles that are
Specifically designed with certain work circumstances in mind
Describe double-segment lenses
They have a segment in the normal position and a second segment at the top of the lens and are most commonly flat tops
What are quadrafocal lens
Double-segmented lens with a flat-top trifocal on the bottom and upside down flat-top segment on the top
Quadrafocal lenses are only available in
Glass
What’s a Minus Add “Rede-Rite” Bifocal
An upcurve bifocal which has more of a minus add at the top of the lens.
It has a huge add area at the bottom and small distance-viewing area at the top
