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OPT 1155 > 1155 > Flashcards

1155 Flashcards

1
Q

Using the nominal lens power formula, calculate the total Lena power having a front surface curve of +6.00 and a back surface curve of -3.00
D1+D2=D3

A

+3

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2
Q

What contribution did Ben Franklin give to the optical profession?

A

Invented bifocal lenses

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3
Q

The index of Refraction of crown glass is?

A

1.523

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4
Q

Define The nominal lens power formula

A

F1+F2=FTotal

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5
Q

Applying the concept of corrected curve lens theory, choose the best base curve for the following -6.00 -2.00 x 90 ASHPERIC LENSES
Sph. Equiv + 1/2 cyl divide by 2 + 6.00 -2.00D bc it’s a aspheric

A

+0.50

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6
Q

Point on a lens where light travels straight through

A

Optical center

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7
Q

An imaginary line perpendicular to lens surface

A

Principle axis

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8
Q

The point around which the lens is edged

A

Mechanical center

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9
Q

Columbia resins 39th formula is what we refer to as?

A

CR 39/ plastic

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10
Q

Applying the concept of corrected curve lens theory, choose the best base curve for the following +4.00 ASPHERICS
SPH EQUIV + 6.00 - 2.00

A

+8.00

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11
Q 
Diverge light 
Virtual focus 
Thinner at center thicker at edges 
Minify image 
Shows with motion 
Are all characteristics of what lens?
A

Minus lens

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12
Q

Apply the concept of corrected curve lens theory, choose the best base curve for the following
-1.00 -6.00 x90
SPH.equiv + 1/2 cyl / 2 + 6.00

A

+4.00

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13
Q

Applying the concept of corrected curve lens theory choose the best base curve for
+6.00-2.00x90
SPH.equiv + 1/2 cyl + 6.00

A

+11.00

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14
Q

Spectacle lenses are prescribe for 4 reasons: refractive errors, faulty binocular vision, protection, and comfort. TRUE OR FALSE?

A

TRUE

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15
Q

Applying the concept of corrected curve lens theory, choose the best base curve for the following:
+1.00 SPH
SPH. Equiv + 6

A

+7.00

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16
Q 
Converge light 
Thicker at center thinner at edges 
Shows against motion 
Effective power increases as the vertex distance increases 
Are for what lens ?
A

Plus lens

17
Q

Applying the concept of corrected curve lens theory, choose the best base curve for the following
-1.00sph
SPH.equiv / 2 + 6.00

A

+5.50

18
Q

Combining cross cylinders

Ex.) -1.25-0.37x180

A

Transpose, make an X, and rewrite the RX in crossed cylinder form
Ex.) -1.25-0.37x180
-1.62+0.37x90
Ans) is -1.25x90 -1.62x180

19
Q

Combining cross cylinders and writing them and plus and minus cylinder
Ex.) +0.25+1.00x90 combine w/
-0.50+1.00x180

A 
Transpose so both have same axis 
Combine the spheres and cylinders algebraically keep same axis 
Ex.) +1.25-1.00x180 
         -0.50+1.00x180
\+0.75 SPH
20
Q

In labeling The optical cross for toric transposition the CC Is the strongest back curve the TBC is the weakest back curve and the BC is the base curve on F1 when the lens is minus cylinder design
TRUE OR FALSE?

A

True

21
Q

Two ways a prism must be expressed in relationship to a prescription are:

A

Prism dioptric power, base direction

22
Q

The direction of a the base direction for prisms is expressed in degrees from ?

A

0-360

23
Q

When light strikes a prism it will deviate towards the ______ while the image will be displaced toward the _____.

A

Base/Apex

24
Q

Excessive prism base down will cause the client to see

A

The floor appears as if concave
As if they are standing in a hole and walking uphill
Vertical objects as being taller then they are

25
Q

Excessive prism base up will cause the client to see

A

The floor appearing convex
On top of the world
Walking downhill
Vertical objects appearing shorter then they are

26
Q

What is the index of refraction for polycarbonate?

A

1.586

27
Q

What is the index of refraction for CR-39

A

1.49

28
Q

How many mm below for a Flat top?

A

5

29
Q

How many mm below for a double d?

A

5 mm

30
Q

How many mm below for a Flat top?

A

5

31
Q

How many mm below for a double d?

A

5 mm

32
Q

How many below for a round seg?

A

1/2 the diameter

33
Q

How many below for an ultex a?

A

19mm

34
Q

How many mm below for a ribbon seg?

A

1/2 the vertical

35
Q

How many for an executive?

A

On seg line

OPT 1155 (1 decks)

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