OPTICIAN ABO EXAM WITH CORRECT
ANSWERS - MODULE 1
1. Fibrous tunic - ANSWER-outside layer comprised of the sclera and the
cornea
2. Vascular tunic - ANSWER-middle layer comprised of the iris, choroid,
and ciliary body
3. Nervous tunic - ANSWER-interior layer comprised of photoreceptors
and neurons
4. Anterior chamber - ANSWER-between the cornea and iris
5. Posterior chamber - ANSWER-between iris and lens
6. Vitreous chamber - ANSWER-between retina and lens and filled with
vitreous humor.
7. Rods vs Cones - ANSWER-● Rods help in low lighting situations
● Cones are used to see color
● The tissue with rods and cones is called the Macula. Only 5mm big
but responsible for our central vision.
● There are 120 million rods and 6 million cones
8. (blank) allows you to see in low lighting situations. (blank) allows you
to see color. - ANSWER-(Rods) allows you to see in low lighting
situations. (Cones) allows you to see color.
,9. There are 120 million (blank) and 6 million (blank) in the eye. -
ANSWER-There are 120 million (Rods) and 6 million (Cones) in the eye.
10. The Cornea is comprised of 5 layers - ANSWER-In order from
outermost layer
● Epithelium
● Bowman's Membrane
● Stroma
● Descemet's Membrane
● Endothelium
11. Helpful tips to remember order:
- EPI- means top/above. ENDO means end
- Then remember your alphabetB-Bowman D-Descemet's
- Stroma -smack in the middle
12. crystalline lens - ANSWER-The crystalline lens is located behind
the iris and helps focus light on the retina. Think of it as the eyes
camera lens
13. The process of focusing is called - ANSWER-accomodation
14. The total optical power of the relaxed eye is approximately -
ANSWER-63 diopters
15. The (?) accounts for approximately 2/3 of this refractive power (?
dioptres) and the (?) contributes the remaining 1/3 (about ? diopters). -
ANSWER-The (cornea) accounts for approximately 2/3 of this refractive
power (43 dioptres) and the crystalline lens contributes the remaining
1/3 (about 20 dioptres). It is very important to remember the powers of
the cornea and crystalline lens
16. fibrous white layer of the eye - ANSWER-sclera
, 17. drains the aqueous humor - ANSWER-Canal of Schlemm
18. aligns light entering the eye onto the retina - ANSWER-Lens
(Crystalline Lens)
19. clear lens that covers the iris; has no blood supply and gets its
oxygen from the air - ANSWER-cornea
20. the hole that allows light to enter the eye and is controlled by the
iris changing size - ANSWER-pupil
21. colored area under the cornea that controls how much light is
entering the eye - ANSWER-iris
22. attached to the lens and controls the shape to focus light -
ANSWER-zonules
23. Ciliary Body - ANSWER-The ciliary body is a circular structure that
is an extension of the iris, the colored part of the eye. The ciliary body
produces the fluid in the eye called aqueous humor. It also contains the
ciliary muscle, which changes the shape of the lens when your eyes
focus on a near object. This process is called accommodation.
24. vascular layer of the eye, containing connective tissues, and
lying between the retina and sclera - ANSWER-Choroid
25. Located in the center of the retina, it's responsible for giving us
clear vision and the ability to see fine detail - ANSWER-Macula
ANSWERS - MODULE 1
1. Fibrous tunic - ANSWER-outside layer comprised of the sclera and the
cornea
2. Vascular tunic - ANSWER-middle layer comprised of the iris, choroid,
and ciliary body
3. Nervous tunic - ANSWER-interior layer comprised of photoreceptors
and neurons
4. Anterior chamber - ANSWER-between the cornea and iris
5. Posterior chamber - ANSWER-between iris and lens
6. Vitreous chamber - ANSWER-between retina and lens and filled with
vitreous humor.
7. Rods vs Cones - ANSWER-● Rods help in low lighting situations
● Cones are used to see color
● The tissue with rods and cones is called the Macula. Only 5mm big
but responsible for our central vision.
● There are 120 million rods and 6 million cones
8. (blank) allows you to see in low lighting situations. (blank) allows you
to see color. - ANSWER-(Rods) allows you to see in low lighting
situations. (Cones) allows you to see color.
,9. There are 120 million (blank) and 6 million (blank) in the eye. -
ANSWER-There are 120 million (Rods) and 6 million (Cones) in the eye.
10. The Cornea is comprised of 5 layers - ANSWER-In order from
outermost layer
● Epithelium
● Bowman's Membrane
● Stroma
● Descemet's Membrane
● Endothelium
11. Helpful tips to remember order:
- EPI- means top/above. ENDO means end
- Then remember your alphabetB-Bowman D-Descemet's
- Stroma -smack in the middle
12. crystalline lens - ANSWER-The crystalline lens is located behind
the iris and helps focus light on the retina. Think of it as the eyes
camera lens
13. The process of focusing is called - ANSWER-accomodation
14. The total optical power of the relaxed eye is approximately -
ANSWER-63 diopters
15. The (?) accounts for approximately 2/3 of this refractive power (?
dioptres) and the (?) contributes the remaining 1/3 (about ? diopters). -
ANSWER-The (cornea) accounts for approximately 2/3 of this refractive
power (43 dioptres) and the crystalline lens contributes the remaining
1/3 (about 20 dioptres). It is very important to remember the powers of
the cornea and crystalline lens
16. fibrous white layer of the eye - ANSWER-sclera
, 17. drains the aqueous humor - ANSWER-Canal of Schlemm
18. aligns light entering the eye onto the retina - ANSWER-Lens
(Crystalline Lens)
19. clear lens that covers the iris; has no blood supply and gets its
oxygen from the air - ANSWER-cornea
20. the hole that allows light to enter the eye and is controlled by the
iris changing size - ANSWER-pupil
21. colored area under the cornea that controls how much light is
entering the eye - ANSWER-iris
22. attached to the lens and controls the shape to focus light -
ANSWER-zonules
23. Ciliary Body - ANSWER-The ciliary body is a circular structure that
is an extension of the iris, the colored part of the eye. The ciliary body
produces the fluid in the eye called aqueous humor. It also contains the
ciliary muscle, which changes the shape of the lens when your eyes
focus on a near object. This process is called accommodation.
24. vascular layer of the eye, containing connective tissues, and
lying between the retina and sclera - ANSWER-Choroid
25. Located in the center of the retina, it's responsible for giving us
clear vision and the ability to see fine detail - ANSWER-Macula
