ABO Exam| 330 QUESTIONS| WITH COMPLETE SOLUTIONS
The extra-ocular muscles are inserted into the sclera and serve to rotate the eye in all possible
directions. There are _______of these muscles. Correct Answer: Six
The fibrous tunic is comprised of the: Correct Answer: Sclera and cornea
Fusion occurs: Correct Answer: In the brain
The aqueous fluid is continually being manufactured by: Correct Answer: The ciliary body
The ability of the eye to bring objects of varying distances to focus on the retina is known as:
Correct Answer: Accommodation
When accommodation is at rest, rays of light from a distant source come to focus behind the
retina. This condition is known as: Correct Answer: Hyperopia
Impulses are carried from the retina to the brain along the: Correct Answer: Optic nerve
That area of the retina capable of perceiving the greatest amount of detail is: Correct Answer:
Fovea centralis
The average cornea has a refractive power of approximately: Correct Answer: 43 diopters
The layer of the cornea which is highly regenerative is: Correct Answer: The epithelium
Night vision is chiefly a function of the: Correct Answer: Rods
A tendency of the visual axis to deviate inward while the eyes are in a position of rest is known
as: Correct Answer: Esophoria
A "farsighted" eye is one that is: Correct Answer: Hyperopic
The term used to indicate "double vision" is: Correct Answer: Diplopia
The condition in which the ability to accommodate for near vision becomes inadequate because
of loss of elasticity of the crystalline lens is called: Correct Answer: Presbyopia
When there is a loss of vision without any apparent disease of the eye it is known as: Correct
Answer: Amblyopia
A refractive error in which the rays of light do not come to a single point of focus is called:
Correct Answer: Astigmatism
The condition in which the crystalline lens of the eye gradually loses its transparency with
consequent loss of visual acuity is known as: Correct Answer: Cataract
,An ocular disease having as its primary characteristic a sustained increase in intraocular pressure.
Correct Answer: Glaucoma
The space between the front of the iris and the innermost portion of the cornea (the
endothelium), this space is filled with aqueous. Correct Answer: Anterior chamber
A tendency of one eye to deviate upward is: Correct Answer: Hyperphoria
The layer of the cornea which comprises ninety percent of its thickness is: Correct Answer: The
stroma
A condition in which the refractive error of one eye significantly differs from that of the other
and where both eyes have the same sign (i.e. both eyes are myopic or hyperopic) is known as:
Correct Answer: Anisometropia
The refractive error which results in two points of focus falling behind the retina is: Correct
Answer: Compound hyperopic astigmatism
The refractive condition caused by a damaged cornea so that rays of light come to many focal
points on the retina is known as: Correct Answer: Irregular astigmatism
The index of refraction of the crystalline lens is: Correct Answer: 1.42
The index of refraction of the cornea is: Correct Answer: 1.37
Myopia means the eye
A. is nearsighted
B. has distance blur
C. requires a (-) minus lens
D. all of the above Correct Answer: D. all of the above
The Retina contains
A. lab tools
B. lens information
C. light receptors
D. understock of frames Correct Answer: C. light receptors
Hyperopic people have difficulty seeing
A. distance objects
B. near objects
C. everything
D. nothing Correct Answer: B. near objects
How many ranges of vision do bifocals provide?
A. one
,B. Three
C. Two
D. Infinite Correct Answer: C. Two
The top portion of a bifocal allows wearers to see:
A. objects in the distance
B. a & c
C. objects beyond arm's length
D. objects up to 18 inches Correct Answer: B. a & c
Characteristics of a plus (+) lens include:
A. thin center
B. minifies objects
C. converges light rays
D. corrects myopia Correct Answer: C. converges light rays
Polycarbonate lens material is:
A. heavy
B. tintable
C. most impact resistant material
D. totally scratch resistant Correct Answer: C. most impact resistant material
Which of the following would be considered a lens enhancement?
A. polycarbonate
B. anti-reflective coating
C. progressive
D. thin center Correct Answer: B. anti-reflective coating
Ultraviolet protection (UV) is not important to
A. children
B. women
C. elderly patients
D. none of the above Correct Answer: D. none of the above
The following information is required on a written prescription:
A. doctor's name
B. doctor's signature
C. date
D. all of the above Correct Answer: D. all of the above
The front surface of lenses can be measured using a ____________. Correct Answer: Lens clock
(Geneva lens measurer).
High plus lenses will produce _________________ distortion while high minus lenses will
produce _____________ distortion. Correct Answer: Pin cushion and barrel.
, The unit of measurement for a wavelength of light is called _____________. Correct Answer:
Nano-meters (nm)
The speed at which light travels is ______________, while _______________ refers to the
number of wave vibrations per second. Correct Answer: Velocity, Frequency.
Give the wavelength range for UVA: __________ UVB: __________ UVC: ___________.
Correct Answer: UVA: 315-380 nm
UVB: 290-315 nm
UVC: 210-290 nm
Wavelengths in the ______________ colored part of the spectrum are thought to provide the
clearest vision. Correct Answer: Green
The focal length of a .50 D lens is _________________. Correct Answer: 2 meters.
There are _________________ millimeters in one meter. Correct Answer: One thousand
The color in the visible spectrum with the shortest wavelength is _________________. Correct
Answer: Violet
Wavelengths that are "in phase" produce:
A. destructive interference
B. high frequencies
C. a big reflection
D. no reflection Correct Answer: C. a big reflection
Anti-reflective coating causes an ______________ situation. Correct Answer: out of phase
(destructive interference)
Minus lenses combine prisms:
A. base to base
B. apex to apex
C. apex to base
D. front to bakc Correct Answer: B. apex to apex
Characteristics of a plus lens include:
A. "with motion"
B. real focal point
C. concave in shape
D. strengthens as vertex shortens Correct Answer: B. real focal point
A prism re-directs light towards its ______________ while the object viewed will appear to be
displaced towards the ________________. Correct Answer: Base; Apex.
In mixed astigmatism:
The extra-ocular muscles are inserted into the sclera and serve to rotate the eye in all possible
directions. There are _______of these muscles. Correct Answer: Six
The fibrous tunic is comprised of the: Correct Answer: Sclera and cornea
Fusion occurs: Correct Answer: In the brain
The aqueous fluid is continually being manufactured by: Correct Answer: The ciliary body
The ability of the eye to bring objects of varying distances to focus on the retina is known as:
Correct Answer: Accommodation
When accommodation is at rest, rays of light from a distant source come to focus behind the
retina. This condition is known as: Correct Answer: Hyperopia
Impulses are carried from the retina to the brain along the: Correct Answer: Optic nerve
That area of the retina capable of perceiving the greatest amount of detail is: Correct Answer:
Fovea centralis
The average cornea has a refractive power of approximately: Correct Answer: 43 diopters
The layer of the cornea which is highly regenerative is: Correct Answer: The epithelium
Night vision is chiefly a function of the: Correct Answer: Rods
A tendency of the visual axis to deviate inward while the eyes are in a position of rest is known
as: Correct Answer: Esophoria
A "farsighted" eye is one that is: Correct Answer: Hyperopic
The term used to indicate "double vision" is: Correct Answer: Diplopia
The condition in which the ability to accommodate for near vision becomes inadequate because
of loss of elasticity of the crystalline lens is called: Correct Answer: Presbyopia
When there is a loss of vision without any apparent disease of the eye it is known as: Correct
Answer: Amblyopia
A refractive error in which the rays of light do not come to a single point of focus is called:
Correct Answer: Astigmatism
The condition in which the crystalline lens of the eye gradually loses its transparency with
consequent loss of visual acuity is known as: Correct Answer: Cataract
,An ocular disease having as its primary characteristic a sustained increase in intraocular pressure.
Correct Answer: Glaucoma
The space between the front of the iris and the innermost portion of the cornea (the
endothelium), this space is filled with aqueous. Correct Answer: Anterior chamber
A tendency of one eye to deviate upward is: Correct Answer: Hyperphoria
The layer of the cornea which comprises ninety percent of its thickness is: Correct Answer: The
stroma
A condition in which the refractive error of one eye significantly differs from that of the other
and where both eyes have the same sign (i.e. both eyes are myopic or hyperopic) is known as:
Correct Answer: Anisometropia
The refractive error which results in two points of focus falling behind the retina is: Correct
Answer: Compound hyperopic astigmatism
The refractive condition caused by a damaged cornea so that rays of light come to many focal
points on the retina is known as: Correct Answer: Irregular astigmatism
The index of refraction of the crystalline lens is: Correct Answer: 1.42
The index of refraction of the cornea is: Correct Answer: 1.37
Myopia means the eye
A. is nearsighted
B. has distance blur
C. requires a (-) minus lens
D. all of the above Correct Answer: D. all of the above
The Retina contains
A. lab tools
B. lens information
C. light receptors
D. understock of frames Correct Answer: C. light receptors
Hyperopic people have difficulty seeing
A. distance objects
B. near objects
C. everything
D. nothing Correct Answer: B. near objects
How many ranges of vision do bifocals provide?
A. one
,B. Three
C. Two
D. Infinite Correct Answer: C. Two
The top portion of a bifocal allows wearers to see:
A. objects in the distance
B. a & c
C. objects beyond arm's length
D. objects up to 18 inches Correct Answer: B. a & c
Characteristics of a plus (+) lens include:
A. thin center
B. minifies objects
C. converges light rays
D. corrects myopia Correct Answer: C. converges light rays
Polycarbonate lens material is:
A. heavy
B. tintable
C. most impact resistant material
D. totally scratch resistant Correct Answer: C. most impact resistant material
Which of the following would be considered a lens enhancement?
A. polycarbonate
B. anti-reflective coating
C. progressive
D. thin center Correct Answer: B. anti-reflective coating
Ultraviolet protection (UV) is not important to
A. children
B. women
C. elderly patients
D. none of the above Correct Answer: D. none of the above
The following information is required on a written prescription:
A. doctor's name
B. doctor's signature
C. date
D. all of the above Correct Answer: D. all of the above
The front surface of lenses can be measured using a ____________. Correct Answer: Lens clock
(Geneva lens measurer).
High plus lenses will produce _________________ distortion while high minus lenses will
produce _____________ distortion. Correct Answer: Pin cushion and barrel.
, The unit of measurement for a wavelength of light is called _____________. Correct Answer:
Nano-meters (nm)
The speed at which light travels is ______________, while _______________ refers to the
number of wave vibrations per second. Correct Answer: Velocity, Frequency.
Give the wavelength range for UVA: __________ UVB: __________ UVC: ___________.
Correct Answer: UVA: 315-380 nm
UVB: 290-315 nm
UVC: 210-290 nm
Wavelengths in the ______________ colored part of the spectrum are thought to provide the
clearest vision. Correct Answer: Green
The focal length of a .50 D lens is _________________. Correct Answer: 2 meters.
There are _________________ millimeters in one meter. Correct Answer: One thousand
The color in the visible spectrum with the shortest wavelength is _________________. Correct
Answer: Violet
Wavelengths that are "in phase" produce:
A. destructive interference
B. high frequencies
C. a big reflection
D. no reflection Correct Answer: C. a big reflection
Anti-reflective coating causes an ______________ situation. Correct Answer: out of phase
(destructive interference)
Minus lenses combine prisms:
A. base to base
B. apex to apex
C. apex to base
D. front to bakc Correct Answer: B. apex to apex
Characteristics of a plus lens include:
A. "with motion"
B. real focal point
C. concave in shape
D. strengthens as vertex shortens Correct Answer: B. real focal point
A prism re-directs light towards its ______________ while the object viewed will appear to be
displaced towards the ________________. Correct Answer: Base; Apex.
In mixed astigmatism:
