ABO ADVANCED EXAMINATION COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR JUST RELEASED
Question 1
An ophthalmic prescription is primarily defined as a formula intended to correct which of the
following?
A) Ocular pathology such as glaucoma
B) Refractive anomalies in an individual patient
C) Intraocular pressure imbalances
D) Bacterial infections of the conjunctiva
E) Vitreous floaters and retinal detachment
Correct Answer: B) Refractive anomalies in an individual patient
Rationale: An ophthalmic prescription specifies the dioptric power required to focus light
correctly on the retina, thereby compensating for nearsightedness, farsightedness, or
astigmatism. It does not treat medical diseases or physiological health issues directly.
Question 2
When a prescription includes prism, which of the following must also be specified for the lens to
be manufactured correctly?
A) The material's Abbe value
B) The specific direction of the base
C) The lens's base curve
D) The frame's pantoscopic tilt
E) The center thickness of the carrier lens
Correct Answer: B) The specific direction of the base
Rationale: Prism moves the image toward the apex and the eye toward the base. Without a
specified direction (Base In, Base Out, Base Up, or Base Down), the lab cannot determine
how to orient the prismatic effect to correct the patient's muscle imbalance or diplopia.
Question 3
What clinical commonality is shared by both Anisometropia and Antimetropia?
A) Both conditions involve high levels of myopia in both eyes
B) Both result in the brain receiving images of significantly unequal size or quality
C) Both are corrected exclusively with contact lenses
D) Both involve a total loss of peripheral vision
E) Both describe the presence of cataracts in the crystalline lens
Correct Answer: B) Both result in the brain receiving images of significantly unequal size or
quality
Rationale: Anisometropia is a significant difference in refractive power between the two
eyes, while Antimetropia involves one eye being myopic and the other being hyperopic.
Both cause the brain to struggle with fusing two different images, potentially leading to
aniseikonia.
, 2
Question 4
Which term specifically describes the condition where the brain perceives two unequal image
sizes from the eyes?
A) Presbyopia
B) Amblyopia
C) Aniseikonia
D) Aphakia
E) Diplopia
Correct Answer: C) Aniseikonia
Rationale: Aniseikonia is a binocular vision anomaly where there is a significant difference
in the perceived size or shape of images. It is often a side effect of correcting a high degree
of anisometropia.
Question 5
What specialized type of lenses are designed to correct the image size differences found in
Aniseikonia?
A) Aspheric Lenses
B) Iseikonic Lenses
C) Bifocal Lenses
D) Polarized Lenses
E) Photochromic Lenses
Correct Answer: B) Iseikonic Lenses
Rationale: Iseikonic lenses use specific combinations of thickness, base curve, and vertex
distance to manipulate the magnification of a lens without changing its refractive power,
thereby equalizing image sizes between the two eyes.
Question 6
When presented with a new prescription for a patient, what is the most critical first step an
optician should take?
A) Select the most expensive frame available
B) Measure the patient's vertex distance immediately
C) Compare the previous prescription to the new one to identify significant changes
D) Heat the frame to ensure it is flexible
E) Determine the patient's insurance eligibility
Correct Answer: C) Compare the previous prescription to the new one to identify significant
changes
Rationale: Comparing prescriptions allows the optician to anticipate adaptation issues.
Significant changes in axis, cylinder power, or a shift from plus to minus can indicate the
need for patient counseling or further verification with the doctor.
, 3
Question 7
What is the primary objective of "Lifestyle Questioning" during the dispensing process?
A) To determine the patient's annual income
B) To find the exact needs and expectations the patient has for their eyewear
C) To convince the patient to buy multiple pairs of shoes
D) To diagnose underlying medical conditions
E) To collect data for government health surveys
Correct Answer: B) To find the exact needs and expectations the patient has for their
eyewear
Rationale: Understanding a patient's daily activities (e.g., computer use, driving, sports)
allows the optician to recommend specific lens materials, coatings, and designs that will
provide the best visual performance for that individual.
Question 8
In a functional human eye, where is the image ideally formed after the process of refraction?
A) In the vitreous humor
B) On the cornea
C) On the retina
D) Inside the crystalline lens
E) On the optic nerve head
Correct Answer: C) On the retina
Rationale: For clear vision, light rays must converge to a single focal point directly on the
retina (specifically the fovea). If they focus in front of or behind the retina, the image will
appear blurred.
Question 9
Regarding the refractive components of the eye, which of the following is true?
A) The cornea has negative dioptric power
B) All refractive components generally contribute plus dioptric power
C) The crystalline lens only provides power when viewing distance objects
D) The aqueous humor has 40 diopters of power
E) The retina acts as a refractive lens
Correct Answer: B) All refractive components generally contribute plus dioptric power
Rationale: The eye is a converging system. Both the cornea and the crystalline lens act as
plus (convex) lenses to bring divergent or parallel light rays together to a focus point on the
retina.
Question 10
The cornea provides approximately how many diopters of the eye's total refractive power?
A) 10 Diopters
B) 17 Diopters
, 4
C) 43 Diopters
D) 60 Diopters
E) 100 Diopters
Correct Answer: C) 43 Diopters
Rationale: The cornea is the primary refractive element of the eye, responsible for about
two-thirds of its total converging power due to the sharp change in refractive index
between the air and the corneal surface.
Question 11
The crystalline lens provides approximately how many diopters of the eye's refractive power
when at rest?
A) 5 Diopters
B) 17 Diopters
C) 43 Diopters
D) 60 Diopters
E) 2.5 Diopters
Correct Answer: B) 17 Diopters
Rationale: The crystalline lens provides approximately one-third of the eye's total power. Its
unique ability is "accommodation," allowing it to increase its plus power to focus on near
objects.
Question 12
What is the approximate total combined refractive power of a standard human eye in diopters?
A) 20 Diopters
B) 40 Diopters
C) 60 Diopters
D) 80 Diopters
E) 100 Diopters
Correct Answer: C) 60 Diopters
Rationale: Combining the roughly 43.00D of the cornea and the 17.00D of the crystalline
lens results in a total system power of approximately 60.00D.
Question 13
According to standard ophthalmic optics data, what is the average axial length of the human eye?
A) 15.5 mm
B) 23.0 mm to 25.0 mm
C) 26.5 mm
D) 30.0 mm
E) 10.0 mm
Correct Answer: C) 26.5 mm
Rationale: Axial length is the distance from the front of the cornea to the retina. (Note:
LATEST UPDATE THIS YEAR JUST RELEASED
Question 1
An ophthalmic prescription is primarily defined as a formula intended to correct which of the
following?
A) Ocular pathology such as glaucoma
B) Refractive anomalies in an individual patient
C) Intraocular pressure imbalances
D) Bacterial infections of the conjunctiva
E) Vitreous floaters and retinal detachment
Correct Answer: B) Refractive anomalies in an individual patient
Rationale: An ophthalmic prescription specifies the dioptric power required to focus light
correctly on the retina, thereby compensating for nearsightedness, farsightedness, or
astigmatism. It does not treat medical diseases or physiological health issues directly.
Question 2
When a prescription includes prism, which of the following must also be specified for the lens to
be manufactured correctly?
A) The material's Abbe value
B) The specific direction of the base
C) The lens's base curve
D) The frame's pantoscopic tilt
E) The center thickness of the carrier lens
Correct Answer: B) The specific direction of the base
Rationale: Prism moves the image toward the apex and the eye toward the base. Without a
specified direction (Base In, Base Out, Base Up, or Base Down), the lab cannot determine
how to orient the prismatic effect to correct the patient's muscle imbalance or diplopia.
Question 3
What clinical commonality is shared by both Anisometropia and Antimetropia?
A) Both conditions involve high levels of myopia in both eyes
B) Both result in the brain receiving images of significantly unequal size or quality
C) Both are corrected exclusively with contact lenses
D) Both involve a total loss of peripheral vision
E) Both describe the presence of cataracts in the crystalline lens
Correct Answer: B) Both result in the brain receiving images of significantly unequal size or
quality
Rationale: Anisometropia is a significant difference in refractive power between the two
eyes, while Antimetropia involves one eye being myopic and the other being hyperopic.
Both cause the brain to struggle with fusing two different images, potentially leading to
aniseikonia.
, 2
Question 4
Which term specifically describes the condition where the brain perceives two unequal image
sizes from the eyes?
A) Presbyopia
B) Amblyopia
C) Aniseikonia
D) Aphakia
E) Diplopia
Correct Answer: C) Aniseikonia
Rationale: Aniseikonia is a binocular vision anomaly where there is a significant difference
in the perceived size or shape of images. It is often a side effect of correcting a high degree
of anisometropia.
Question 5
What specialized type of lenses are designed to correct the image size differences found in
Aniseikonia?
A) Aspheric Lenses
B) Iseikonic Lenses
C) Bifocal Lenses
D) Polarized Lenses
E) Photochromic Lenses
Correct Answer: B) Iseikonic Lenses
Rationale: Iseikonic lenses use specific combinations of thickness, base curve, and vertex
distance to manipulate the magnification of a lens without changing its refractive power,
thereby equalizing image sizes between the two eyes.
Question 6
When presented with a new prescription for a patient, what is the most critical first step an
optician should take?
A) Select the most expensive frame available
B) Measure the patient's vertex distance immediately
C) Compare the previous prescription to the new one to identify significant changes
D) Heat the frame to ensure it is flexible
E) Determine the patient's insurance eligibility
Correct Answer: C) Compare the previous prescription to the new one to identify significant
changes
Rationale: Comparing prescriptions allows the optician to anticipate adaptation issues.
Significant changes in axis, cylinder power, or a shift from plus to minus can indicate the
need for patient counseling or further verification with the doctor.
, 3
Question 7
What is the primary objective of "Lifestyle Questioning" during the dispensing process?
A) To determine the patient's annual income
B) To find the exact needs and expectations the patient has for their eyewear
C) To convince the patient to buy multiple pairs of shoes
D) To diagnose underlying medical conditions
E) To collect data for government health surveys
Correct Answer: B) To find the exact needs and expectations the patient has for their
eyewear
Rationale: Understanding a patient's daily activities (e.g., computer use, driving, sports)
allows the optician to recommend specific lens materials, coatings, and designs that will
provide the best visual performance for that individual.
Question 8
In a functional human eye, where is the image ideally formed after the process of refraction?
A) In the vitreous humor
B) On the cornea
C) On the retina
D) Inside the crystalline lens
E) On the optic nerve head
Correct Answer: C) On the retina
Rationale: For clear vision, light rays must converge to a single focal point directly on the
retina (specifically the fovea). If they focus in front of or behind the retina, the image will
appear blurred.
Question 9
Regarding the refractive components of the eye, which of the following is true?
A) The cornea has negative dioptric power
B) All refractive components generally contribute plus dioptric power
C) The crystalline lens only provides power when viewing distance objects
D) The aqueous humor has 40 diopters of power
E) The retina acts as a refractive lens
Correct Answer: B) All refractive components generally contribute plus dioptric power
Rationale: The eye is a converging system. Both the cornea and the crystalline lens act as
plus (convex) lenses to bring divergent or parallel light rays together to a focus point on the
retina.
Question 10
The cornea provides approximately how many diopters of the eye's total refractive power?
A) 10 Diopters
B) 17 Diopters
, 4
C) 43 Diopters
D) 60 Diopters
E) 100 Diopters
Correct Answer: C) 43 Diopters
Rationale: The cornea is the primary refractive element of the eye, responsible for about
two-thirds of its total converging power due to the sharp change in refractive index
between the air and the corneal surface.
Question 11
The crystalline lens provides approximately how many diopters of the eye's refractive power
when at rest?
A) 5 Diopters
B) 17 Diopters
C) 43 Diopters
D) 60 Diopters
E) 2.5 Diopters
Correct Answer: B) 17 Diopters
Rationale: The crystalline lens provides approximately one-third of the eye's total power. Its
unique ability is "accommodation," allowing it to increase its plus power to focus on near
objects.
Question 12
What is the approximate total combined refractive power of a standard human eye in diopters?
A) 20 Diopters
B) 40 Diopters
C) 60 Diopters
D) 80 Diopters
E) 100 Diopters
Correct Answer: C) 60 Diopters
Rationale: Combining the roughly 43.00D of the cornea and the 17.00D of the crystalline
lens results in a total system power of approximately 60.00D.
Question 13
According to standard ophthalmic optics data, what is the average axial length of the human eye?
A) 15.5 mm
B) 23.0 mm to 25.0 mm
C) 26.5 mm
D) 30.0 mm
E) 10.0 mm
Correct Answer: C) 26.5 mm
Rationale: Axial length is the distance from the front of the cornea to the retina. (Note:
