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peter lec Flashcards

(13 cards)

1
Q

What are bifocals used for

A

Correction of presbyopia and are needed to replace plus power

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2
Q

Who developed Bifocals

A

Ben Franklin in 1784

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3
Q

what are Stock lenses

A

lenses that are finished and referred to uncuts

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4
Q

what do Progressive lenses have

A

Have a corridor and intermediate vision and a fitting cross

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5
Q

the fitting cross is usually how many mm from the corridor

A

4mm above

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6
Q

What markings do Progressive lens have

A

Distance verification circle, near verification circle, fitting cross, prism reference point, Datum line

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7
Q

Where are progressives usually measured

A

At the mid-pupil

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8
Q

Progressive lens verification have

A

Manufacturers engrave brand icons and add power usually on the nasal side

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9
Q

How do you find distance decentration

A

FPD-DPD

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10
Q

How do you find inset

A

DPD-NPD

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11
Q

How do you find the below measurement

A

half of B and subtract by height and you get your below

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12
Q

How do you find total decentration

A

DPD+Inset

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13
Q
A
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