QUIZ (1.0)

Question 1

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

Answer 1

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

Question 2

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

Answer 2

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

Question 3

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

Answer 3

b. oblique bi-toric

Question 4

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

Answer 4

d. All of the above

Question 5

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

Answer 5

d. All of the above

Question 6

Due to the peripheral toroidal area, the optic zone exhibits

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

Answer 6

d. None of the above

Question 7

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

Answer 7

b. Tri-focal CL

Question 8

Example of an aspheric back surface are

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

Answer 8

c. hyperbola

Question 9

It corresponds to the back central optic radius

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

Answer 9

c. Vertex radius

Question 10

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

Answer 10

c. Central toric contact lenses

Question 11

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

Answer 11

a. Peripheral Zone

Question 12

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

Answer 12

a. Front surface

Question 13

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

Answer 13

e.Multi-curve surfaces

Question 14

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

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

Answer 14

c. Aspherical Zone

Question 15

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

Answer 15

a. Form stability

Question 16

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

Answer 16

a. Stabilizer

Question 17

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

Answer 17

a. Hard Contact Lens

Question 18

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

Answer 18

b. bi-toric

Question 19

This zone is an area between two zones

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

Answer 19

d. Transition Zone

Question 20

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

Answer 20

b. Back surface

Question 21

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

Answer 21

b. Disinfecting purposes

Question 22

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

Answer 22

c. Aspheric back surface

Question 23

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

Answer 23

a. Bi-focal CL

Question 24

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

Answer 24

c. Aspheric back surface

Question 25

A CL without dioptric power is called: a. Contact Lens b. Contact c. Contact Shell d. Powerless CL

Answer 25

c. Contact Shell

Question 26

Contact lenses with a spherical power may be a. corneal b. corneo- scleral c. scleral d. All of the above

Answer 26

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

Question 27

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

Answer 27

b. Soft Contact Lens

Question 28

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

Answer 28

a. Peripheral toric contact lens

Question 29

Most of the CL of this type has an elliptic profile described by a. Eccentricity b. Centricity c. Toricity d. None of the above

Answer 29

a. Eccentricity

Question 30

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

Answer 30

d. Mono-curve

Question 31

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

Answer 31

c. Aspheric back surface

Question 32

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

Answer 32

b. Back surface

Question 33

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

Answer 33

b. Contact lens

Question 34

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

Answer 34

b. Optic Zone

Question 35

Contact lenses with two or more spherical peripheral zones are called _______ a. Front b. Back c. Bi-curve d. Mono-curve e. Multi-curve

Answer 35

e. Multi-curve

Question 36

The Spherical front surfaces are called: a. Front surface b. Back surface c. Bi-curve surface d. Mono-curve surfaces e. Multi-curve surfaces

Answer 36

d. Mono-curve surfaces

Question 37

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

Answer 37

c. Bi-curve surface

Question 38

``` 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 ```

Answer 38

c. Aspherical Zone

Question 39

In __________contact lenses a spherical peripheral zone is also present a. Front b. Back c. Bi-curve d. Mono-curve e. Multi-curve

Answer 39

c. Bi-curve

Question 40

This zone may be spherical, aspherical or conical a. Peripheral Zone b. Optic Zone c. Aspherical Zone d. Transition Zone

Answer 40

a. Peripheral Zone