OCPP BOOK 2 TEST
How much accommodative ability does the average person have at birth? -
CORRECT ANSWER-15.00D
Objects appear to focus in front of a _____ lens. - CORRECT ANSWER-minus
When a ray of light leaves crown glass, its angle with the normal to the surface is
only 8 degrees. If it has an angle of refraction of 12 degrees, what is the angle of
deviation when it leaves the glass? - CORRECT ANSWER--4 degrees
which frame material begins as granules that are heated until liquid and then
injection-molded to the desired frame? - CORRECT ANSWER-Propionate
If light of about 550 millimicrons reaches your eyes, you will have a sensation of
seeing ? - CORRECT ANSWER-green
If a glass rod is surrounded by another medium of the same index of refraction,
then the rod will be_____ - CORRECT ANSWER-partly visible depending on the
viewing angle
Plus lenses _____ - CORRECT ANSWER-show against motion
Progressive power can change from distance to near zones in either a rapid or
slow fashion. If it changes in a rapid fashion, then which of the following does not
occur? - CORRECT ANSWER-the lens has a short progressive corridor
the index of refraction of cr-39 is - CORRECT ANSWER-1.49
this aberration results in a slight blurring of the image due to the fact that a lens
will have the tendency to focus light rays from the periphery sooner than the rays
passing through the central portion of the lens _____ - CORRECT
ANSWER-spherical
the fitting cross for a general purpose progressive addition lens would be fitted
higher than specified by the lens manufacturer in which of the following cases? -
, CORRECT ANSWER-If the progressive lens is used to inhibit accommodavtive
esotropia in children
In a plus lens with aspheric design the surface curvature ____ - CORRECT
ANSWER-flattens from center to edge
what i the dioptric power of a lens with a foal length of -33.3mm? - CORRECT
ANSWER-+30.00D
when children are fitted with progressive addition lenses,yet still have the ability
to accommodate just as other children do, the fitting cross is usually set
________ - CORRECT ANSWER-4mm above the pupil center
it makes sense to utilize aspheric lenses in many dispensing situations since they
______ - CORRECT ANSWER-will create a more cosmetically appealing lens
although all of the factors listed below are important i the fitting of progressive
lenses, which factor has the most influence on wearer satisfaction? - CORRECT
ANSWER-fitting accuracy
visible light is in the range of wave lengths approximately: - CORRECT
ANSWER-380 to 760 nanometers
which progressive addition lens is specifically designed for frames with a narrow
B dimension? - CORRECT ANSWER-soft design
light traveling through air encounters a second medium which slows the light to
100,000 miles/second. what is the index of the second medium? - CORRECT
ANSWER-1.86
which metal frame material is lightweight and can be finished in a variety of
colors? - CORRECT ANSWER-aluminum
when a ray of light travels from a less dense medium to a kenser medium, r is
less than i and d is positive: - CORRECT ANSWER-true
How much accommodative ability does the average person have at birth? -
CORRECT ANSWER-15.00D
Objects appear to focus in front of a _____ lens. - CORRECT ANSWER-minus
When a ray of light leaves crown glass, its angle with the normal to the surface is
only 8 degrees. If it has an angle of refraction of 12 degrees, what is the angle of
deviation when it leaves the glass? - CORRECT ANSWER--4 degrees
which frame material begins as granules that are heated until liquid and then
injection-molded to the desired frame? - CORRECT ANSWER-Propionate
If light of about 550 millimicrons reaches your eyes, you will have a sensation of
seeing ? - CORRECT ANSWER-green
If a glass rod is surrounded by another medium of the same index of refraction,
then the rod will be_____ - CORRECT ANSWER-partly visible depending on the
viewing angle
Plus lenses _____ - CORRECT ANSWER-show against motion
Progressive power can change from distance to near zones in either a rapid or
slow fashion. If it changes in a rapid fashion, then which of the following does not
occur? - CORRECT ANSWER-the lens has a short progressive corridor
the index of refraction of cr-39 is - CORRECT ANSWER-1.49
this aberration results in a slight blurring of the image due to the fact that a lens
will have the tendency to focus light rays from the periphery sooner than the rays
passing through the central portion of the lens _____ - CORRECT
ANSWER-spherical
the fitting cross for a general purpose progressive addition lens would be fitted
higher than specified by the lens manufacturer in which of the following cases? -
, CORRECT ANSWER-If the progressive lens is used to inhibit accommodavtive
esotropia in children
In a plus lens with aspheric design the surface curvature ____ - CORRECT
ANSWER-flattens from center to edge
what i the dioptric power of a lens with a foal length of -33.3mm? - CORRECT
ANSWER-+30.00D
when children are fitted with progressive addition lenses,yet still have the ability
to accommodate just as other children do, the fitting cross is usually set
________ - CORRECT ANSWER-4mm above the pupil center
it makes sense to utilize aspheric lenses in many dispensing situations since they
______ - CORRECT ANSWER-will create a more cosmetically appealing lens
although all of the factors listed below are important i the fitting of progressive
lenses, which factor has the most influence on wearer satisfaction? - CORRECT
ANSWER-fitting accuracy
visible light is in the range of wave lengths approximately: - CORRECT
ANSWER-380 to 760 nanometers
which progressive addition lens is specifically designed for frames with a narrow
B dimension? - CORRECT ANSWER-soft design
light traveling through air encounters a second medium which slows the light to
100,000 miles/second. what is the index of the second medium? - CORRECT
ANSWER-1.86
which metal frame material is lightweight and can be finished in a variety of
colors? - CORRECT ANSWER-aluminum
when a ray of light travels from a less dense medium to a kenser medium, r is
less than i and d is positive: - CORRECT ANSWER-true
