age 1 of 205
Certified Diagnostic Ophthalmic Sonographer (CDOS)
Exam COMPLETE QUESTIONS AND DETAILED
SOLUTIONS LATEST UPDATE THIS YEAR JUST
RELEASED.pdf
SECTION 1: OCULAR ANATOMY & PHYSIOLOGY (Questions 1-
45)
1. Which ocular layer contains the choroidal vasculature that
supplies the outer retina?
A) Sclera
B) Iris
C) Uvea
,age 2 of 205
D) Retina
Answer: C
Rationale: The uvea comprises the iris, ciliary body, and choroid;
the choroid provides the main blood supply to the outer retina.
The sclera is the outer fibrous layer; the retina is the innermost
neural layer .
2. The average axial length of an adult human eye is closest to:
A) 16 mm
B) 22 mm
,age 3 of 205
C) 24 mm
D) 28 mm
Answer: C
Rationale: Normal adult axial length ranges from 22–24 mm;
24 mm is often cited as the average. Axial lengths > 26.5 mm
are associated with myopia and staphyloma formation .
3. Which of the following are components of the uveal tract?
(Select all that apply)
☐ A) Iris
☐ B) Ciliary body
, age 4 of 205
☐ C) Choroid
☐ D) Sclera
☐ E) Retina
Answer: A, B, C
Rationale: The uveal tract (vascular layer) consists of the iris
(anterior), ciliary body (middle), and choroid (posterior). The
sclera is the fibrous outer layer, and the retina is the neural
layer .
Certified Diagnostic Ophthalmic Sonographer (CDOS)
Exam COMPLETE QUESTIONS AND DETAILED
SOLUTIONS LATEST UPDATE THIS YEAR JUST
RELEASED.pdf
SECTION 1: OCULAR ANATOMY & PHYSIOLOGY (Questions 1-
45)
1. Which ocular layer contains the choroidal vasculature that
supplies the outer retina?
A) Sclera
B) Iris
C) Uvea
,age 2 of 205
D) Retina
Answer: C
Rationale: The uvea comprises the iris, ciliary body, and choroid;
the choroid provides the main blood supply to the outer retina.
The sclera is the outer fibrous layer; the retina is the innermost
neural layer .
2. The average axial length of an adult human eye is closest to:
A) 16 mm
B) 22 mm
,age 3 of 205
C) 24 mm
D) 28 mm
Answer: C
Rationale: Normal adult axial length ranges from 22–24 mm;
24 mm is often cited as the average. Axial lengths > 26.5 mm
are associated with myopia and staphyloma formation .
3. Which of the following are components of the uveal tract?
(Select all that apply)
☐ A) Iris
☐ B) Ciliary body
, age 4 of 205
☐ C) Choroid
☐ D) Sclera
☐ E) Retina
Answer: A, B, C
Rationale: The uveal tract (vascular layer) consists of the iris
(anterior), ciliary body (middle), and choroid (posterior). The
sclera is the fibrous outer layer, and the retina is the neural
layer .
