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CONTACT LENS (RNH) > QUIZ (1.0) > Flashcards

QUIZ (1.0) Flashcards

1
Q

The axis directions of the front surface and the back surface torus can be __________ to each other

a. parallel
b. perpendicular
c. at an angle
d. All of the above

A

d. All of the above
* parallel
* perpendicular
* at an angle

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2
Q

They have an optic zone with a spherical dioptric power and a peripheral area with one or several spherical, aspherical or conical zones.

a. corneal
b. corneo- scleral
c. scleral
d. All of the above

A

d. All of the above
* corneal
* corneo- scleral
* scleral

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3
Q

The axis directions of the front surface torus and the back surface torus is at an angle to each other is called

a. right angle bi-toric
b. oblique bi-toric
c. parallel bi-toric
d. All of the above

A

b. oblique bi-toric

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4
Q 
A center of gravity displacement that can
result in axis stabilization is done by
a. prism ballast
b. truncation
c. thin zones
d. All of the above
A

d. All of the above

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5
Q

Contact lens with a spherical power and a spherical optic zone is identified by

a. DIN marketing
b. Manufacturer’s symbol
c. Total diameter
d. All of the above

A

d. All of the above

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6
Q

Due to the peripheral toroidal area, the optic zone exhibits

a. Triangular form
b. Oval form
c. Rectangular form
d. None of the above

A

d. None of the above

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7
Q

Contact lenses with three optic zones of different dioptric powers are known as

a. Bi-focal CL
b. Tri-focal CL
c. Multi-focal CL
d. None of the above

A

b. Tri-focal CL

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8
Q

Example of an aspheric back surface are

a. ellipse
b. parabola
c. hyperbola
d. All of the above

A

c. hyperbola

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9
Q

It corresponds to the back central optic radius

a. Vertex diameter
b. Vertex power
c. Vertex radius
d. All of the above

A

c. Vertex radius

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10
Q

Contact lenses with an astigmatic power are known as

a. Bi-toric contact lenses
b. Peripheral toric contact lenses
c. Central toric contact lenses
d. All of the above

A

c. Central toric contact lenses

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11
Q

This is the zone in the outer area of the front or back surface

a. Peripheral Zone
b. Optic Zone
c. Aspherical Zone
d. Transition Zone

A

a. Peripheral Zone

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12
Q

The surface of a contact lens facing the object is called the:

a. Front surface
b. Back surface
c. Bi-curve surface
d. Mono-curve surfaces
e. Multi-curve surfaces

A

a. Front surface

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13
Q 
This surfaces have more than three coaxial
radii of curvature.
a. Front surface
b. Back surface 
c. Bi-curve surface 
d. Mono-curve surfaces 
e. Multi-curve surfaces
A

e.Multi-curve surfaces

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14
Q

This zone can, for example, be ellipsoidal, paraboloidal or hyperboloidal.

a. Peripheral Zone
b. Optic Zone
c. Aspherical Zone
d. Transition Zone

A

c. Aspherical Zone

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15
Q

This serves as a criterion for distinguishing between hard and soft .

a. Form stability
b. Form sustainability
c. Form size
d. None of the above

A

a. Form stability

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16
Q

In order to obtain the required cylinder axis of the astigmatic power of the toric contact lens must be provided with

a. Stabilizer
b. Neutralizer
c. Provider
d. None of the above

A

a. Stabilizer

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17
Q

These are lenses which in normal conditions retain their shape without support

a. Hard Contact Lens
b. Soft Contact Lens
c. Hydrogel Lens
d. None of the above

A

a. Hard Contact Lens

18
Q

If the front surface and the back surface are toroidal, the contact lens is described as

a. tri-toric
b. bi-toric
c. uni-toric
d. None of the above

A

b. bi-toric

19
Q

This zone is an area between two zones

a. Peripheral Zone
b. Optic Zone
c. Aspherical Zone
d. Transition Zone

A

d. Transition Zone

20
Q

The surface of a contact lens the surface facing the eye is known as the:

a. Front surface
b. Back surface
c. Bi-curve surface
d. Mono-curve surfaces
e. Multi-curve surfaces

A

b. Back surface

21
Q

The specification of the type of contact lens and the vertex power is necessary for:

a. Cleaning purposes
b. Disinfecting purposes
c. Identification purposes
d. All of the above

A

b. Disinfecting purposes

22
Q

Most of the CL of this type has an elliptic profile

a. Bi-toric surface
b. Spheric back surface
c. Aspheric back surface
d. None of the above

A

c. Aspheric back surface

23
Q

Contact lenses with two optic zones of different dioptric powers are known as

a. Bi-focal CL
b. Tri-focal CL
c. Multi-focal CL
d. None of the above

A

a. Bi-focal CL

24
Q

This lens type corresponds to a conical section

a. Bi-toric surface
b. Spheric back surface
c. Aspheric back surface
d. None of the above

A

c. Aspheric back surface

25
Q

A CL without dioptric power is called:

a. Contact Lens
b. Contact
c. Contact Shell
d. Powerless CL

A

c. Contact Shell

26
Q

Contact lenses with a spherical power may be

a. corneal
b. corneo- scleral
c. scleral
d. All of the above

A

d. All of the above
* corneal
* corneo- scleral
* scleral

27
Q

These are lenses that change their shape if they are not supported

a. Hard Contact Lens
b. Soft Contact Lens
c. Hydrogel Lens
d. None of the above

A

b. Soft Contact Lens

28
Q

A special form of contact lens that has a spherical optic zone and a peripheral toroidal area on the front or back surface.

a. Peripheral toric contact lens
b. Spherical contact lens
c. Tri-curve contact lens
d. None of the above

A

a. Peripheral toric contact lens

29
Q

Most of the CL of this type has an elliptic profile described by

a. Eccentricity
b. Centricity
c. Toricity
d. None of the above

A

a. Eccentricity

30
Q

If the back surface is mono-curve, the contact lens itself is described as ______

a. Front
b. Back
c. Bi-curve
d. Mono-curve
e. Multi-curve

A

d. Mono-curve

31
Q

A CL that has an optic zone which is not spherical

a. Bi-toric surface
b. Spheric back surface
c. Aspheric back surface
d. None of the above

A

c. Aspheric back surface

32
Q

Contact lenses with a spherical power may have different __________ profile

a. Front surface
b. Back surface
c. Bi-curve surface
d. Mono-curve surfaces
e. Multi-curve surfaces

A

b. Back surface

33
Q

It is used for all visual aids which come into direct contact with the anterior ocular segment.

a. Spectacles
b. Contact lens
c. Eye glasses
d. Shades

A

b. Contact lens

34
Q

The area of a contact lens displaying the required dioptric power for the correction is called:

a. Peripheral Zone
b. Optic Zone
c. Aspherical Zone
d. Transition Zone

A

b. Optic Zone

35
Q

Contact lenses with two or more spherical peripheral zones are called _______

a. Front
b. Back
c. Bi-curve
d. Mono-curve
e. Multi-curve

A

e. Multi-curve

36
Q

The Spherical front surfaces are called:

a. Front surface
b. Back surface
c. Bi-curve surface
d. Mono-curve surfaces
e. Multi-curve surfaces

A

d. Mono-curve surfaces

37
Q

If a front or back surface features two zones with different coaxial radii of curvature, it is called:

a. Front surface
b. Back surface
c. Bi-curve surface
d. Mono-curve surfaces
e. Multi-curve surfaces

A

c. Bi-curve surface

38
Q 
This zone is a curved area of the surface
which is neither spherical nor conical
a. Peripheral Zone
b. Optic Zone
c. Aspherical Zone
d. Transition Zone
A

c. Aspherical Zone

39
Q

In __________contact lenses a spherical peripheral zone is also present

a. Front
b. Back
c. Bi-curve
d. Mono-curve
e. Multi-curve

A

c. Bi-curve

40
Q

This zone may be spherical, aspherical or conical

a. Peripheral Zone
b. Optic Zone
c. Aspherical Zone
d. Transition Zone

A

a. Peripheral Zone

CONTACT LENS (RNH) (8 decks)

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