QUIZ (1.0) Flashcards
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
d. All of the above
* parallel
* perpendicular
* at an angle
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
d. All of the above
* corneal
* corneo- scleral
* scleral
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
b. oblique bi-toric
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
d. All of the above
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
d. All of the above
Due to the peripheral toroidal area, the optic zone exhibits
a. Triangular form
b. Oval form
c. Rectangular form
d. None of the above
d. None of the above
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
b. Tri-focal CL
Example of an aspheric back surface are
a. ellipse
b. parabola
c. hyperbola
d. All of the above
c. hyperbola
It corresponds to the back central optic radius
a. Vertex diameter
b. Vertex power
c. Vertex radius
d. All of the above
c. Vertex radius
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
c. Central toric contact lenses
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. Peripheral Zone
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. Front surface
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
e.Multi-curve surfaces
This zone can, for example, be ellipsoidal, paraboloidal or hyperboloidal.
a. Peripheral Zone
b. Optic Zone
c. Aspherical Zone
d. Transition Zone
c. Aspherical Zone
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. Form stability
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. Stabilizer