[HAADOptometry] HAAD Optometry DOH
Licensureination for Optometry
Certification Exam Preparation
**Question 1. Which of the following phenomena best describes the bending of light when it
passes from air into a medium of higher refractive index?**
A) Reflection
B) Refraction
C) Diffraction
D) Polarization
Answer: B
Explanation: Refraction is the change in direction of a light ray as it passes from one medium to
another with a different refractive index, causing the ray to bend toward the normal in a denser
medium.
**Question 2. The focal length of a thin convex lens is 40 mm. If an object is placed 120 mm
from the lens, where will the image be formed?**
A) 30 mm on the same side as the object
B) 30 mm on the opposite side of the lens
C) 60 mm on the opposite side of the lens
D) 120 mm on the same side as the object
Answer: C
Explanation: Using the thin lens formula 1/f = 1/v + 1/u (sign convention: u = –120 mm, f =
+40 mm). Solving gives v = +60 mm, meaning the image forms 60 mm on the opposite side of
the lens.
**Question 3. Which type of aberration is characterized by a peripheral blur that increases as
the pupil diameter becomes larger?**
A) Chromatic aberration
B) Spherical aberration
, [HAADOptometry] HAAD Optometry DOH
Licensureination for Optometry
Certification Exam Preparation
C) Coma
D) Astigmatism
Answer: B
Explanation: Spherical aberration occurs because peripheral rays of a spherical lens are focused
at a different point than para‑paraxial rays, leading to increased blur with larger pupils.
**Question 4. In the reduced schematic eye, the total refractive power is approximately:**
A) 40 D
B) 58 D
C) 70 D
D) 85 D
Answer: B
Explanation: The reduced eye model has a single refracting surface with a total power of about
58 diopters, which approximates the combined corneal and lenticular power of the human eye.
**Question 5. A patient presents with a far point of 0.5 m and normal near vision. Which
refractive error is most likely?**
A) Myopia
B) Hyperopia
C) Astigmatism
D) Presbyopia
Answer: A
Explanation: Myopia is defined by a finite far point; a far point of 0.5 m corresponds to –2.00 D
of myopic correction.
, [HAADOptometry] HAAD Optometry DOH
Licensureination for Optometry
Certification Exam Preparation
**Question 6. The amplitude of accommodation in a 20‑year‑old is approximately:**
A) 2 D
B) 4 D
C) 8 D
D) 12 D
Answer: C
Explanation: Young adults typically have a total accommodative amplitude of about 8–10 D,
decreasing with age.
**Question 7. Which layer of the cornea provides the majority of its tensile strength?**
A) Epithelium
B) Bowman's layer
C) Stroma
D) Endothelium
Answer: C
Explanation: The corneal stroma, composed of regularly arranged collagen lamellae, contributes
>90 % of corneal tensile strength.
**Question 8. The primary blood supply to the outer retina (photoreceptor layer) is derived
from:**
A) Central retinal artery
B) Choroidal circulation
C) Ciliary arteries
D) Posterior ciliary arteries
, [HAADOptometry] HAAD Optometry DOH
Licensureination for Optometry
Certification Exam Preparation
Answer: B
Explanation: The outer retina receives nutrients and oxygen mainly from the choroidal
vasculature, while the inner retina is supplied by the central retinal artery.
**Question 9. Which cranial nerve innervates the superior oblique extraocular muscle?**
A) III (Oculomotor)
B) IV (Trochlear)
C) VI (Abducens)
D) VII (Facial)
Answer: B
Explanation: The trochlear nerve (CN IV) uniquely innervates the superior oblique muscle.
**Question 10. In static retinoscopy, a “with‑plus” reflex indicates:**
A) Myopia
B) Hyperopia
C) Astigmatism
D) Emmetropia
Answer: B
Explanation: A “with‑plus” reflex (light moves in the same direction as the retinoscope) suggests
a hyperopic eye because the focal point lies behind the retina.
**Question 11. During subjective refraction, the purpose of fogging the eye is to:**
A) Increase depth of focus
B) Prevent accommodation from influencing the result
Licensureination for Optometry
Certification Exam Preparation
**Question 1. Which of the following phenomena best describes the bending of light when it
passes from air into a medium of higher refractive index?**
A) Reflection
B) Refraction
C) Diffraction
D) Polarization
Answer: B
Explanation: Refraction is the change in direction of a light ray as it passes from one medium to
another with a different refractive index, causing the ray to bend toward the normal in a denser
medium.
**Question 2. The focal length of a thin convex lens is 40 mm. If an object is placed 120 mm
from the lens, where will the image be formed?**
A) 30 mm on the same side as the object
B) 30 mm on the opposite side of the lens
C) 60 mm on the opposite side of the lens
D) 120 mm on the same side as the object
Answer: C
Explanation: Using the thin lens formula 1/f = 1/v + 1/u (sign convention: u = –120 mm, f =
+40 mm). Solving gives v = +60 mm, meaning the image forms 60 mm on the opposite side of
the lens.
**Question 3. Which type of aberration is characterized by a peripheral blur that increases as
the pupil diameter becomes larger?**
A) Chromatic aberration
B) Spherical aberration
, [HAADOptometry] HAAD Optometry DOH
Licensureination for Optometry
Certification Exam Preparation
C) Coma
D) Astigmatism
Answer: B
Explanation: Spherical aberration occurs because peripheral rays of a spherical lens are focused
at a different point than para‑paraxial rays, leading to increased blur with larger pupils.
**Question 4. In the reduced schematic eye, the total refractive power is approximately:**
A) 40 D
B) 58 D
C) 70 D
D) 85 D
Answer: B
Explanation: The reduced eye model has a single refracting surface with a total power of about
58 diopters, which approximates the combined corneal and lenticular power of the human eye.
**Question 5. A patient presents with a far point of 0.5 m and normal near vision. Which
refractive error is most likely?**
A) Myopia
B) Hyperopia
C) Astigmatism
D) Presbyopia
Answer: A
Explanation: Myopia is defined by a finite far point; a far point of 0.5 m corresponds to –2.00 D
of myopic correction.
, [HAADOptometry] HAAD Optometry DOH
Licensureination for Optometry
Certification Exam Preparation
**Question 6. The amplitude of accommodation in a 20‑year‑old is approximately:**
A) 2 D
B) 4 D
C) 8 D
D) 12 D
Answer: C
Explanation: Young adults typically have a total accommodative amplitude of about 8–10 D,
decreasing with age.
**Question 7. Which layer of the cornea provides the majority of its tensile strength?**
A) Epithelium
B) Bowman's layer
C) Stroma
D) Endothelium
Answer: C
Explanation: The corneal stroma, composed of regularly arranged collagen lamellae, contributes
>90 % of corneal tensile strength.
**Question 8. The primary blood supply to the outer retina (photoreceptor layer) is derived
from:**
A) Central retinal artery
B) Choroidal circulation
C) Ciliary arteries
D) Posterior ciliary arteries
, [HAADOptometry] HAAD Optometry DOH
Licensureination for Optometry
Certification Exam Preparation
Answer: B
Explanation: The outer retina receives nutrients and oxygen mainly from the choroidal
vasculature, while the inner retina is supplied by the central retinal artery.
**Question 9. Which cranial nerve innervates the superior oblique extraocular muscle?**
A) III (Oculomotor)
B) IV (Trochlear)
C) VI (Abducens)
D) VII (Facial)
Answer: B
Explanation: The trochlear nerve (CN IV) uniquely innervates the superior oblique muscle.
**Question 10. In static retinoscopy, a “with‑plus” reflex indicates:**
A) Myopia
B) Hyperopia
C) Astigmatism
D) Emmetropia
Answer: B
Explanation: A “with‑plus” reflex (light moves in the same direction as the retinoscope) suggests
a hyperopic eye because the focal point lies behind the retina.
**Question 11. During subjective refraction, the purpose of fogging the eye is to:**
A) Increase depth of focus
B) Prevent accommodation from influencing the result
