Certified Ophthalmic Technician Exam Review -
Cot Ophthalmology Chapter 4 Visual Fields
Questions with Correct Answers 2025
Each mm on the retina is equal to how many degrees on the visual field? - CORRECT ANSWER -
5 degrees
The light receptor cells of the retina are the: - CORRECT ANSWER -Rods and cones
An object on the patient's right will be perceived by the patient's: - CORRECT ANSWER -
temporal retina OS and nasal retina OD
The nerve fibers are axon extensions of the: - CORRECT ANSWER -Ganglion cells
The autonomic pattern of the nerve fibers produces visual field defects: - CORRECT ANSWER -
That correspond to the location of the nerve fibers
The "blind spot" as plotted on a visual field test corresponds to: - CORRECT ANSWER -
The optic disc
The size of the average blind spot is: - CORRECT ANSWER -
5.5 degrees wide and 7.5 degrees high
On the visual field, the average blind spot is located: - CORRECT ANSWER -
15 degrees temporal to fixation
If you increase the visual field testing distance, the blind spot will: - CORRECT ANSWER -
GetRlarger in cm but remain the same in degrees
,what happens at the optic chasm? - CORRECT ANSWER -
nasal nerve fibers from each eye cross over to the opposite side
The gland that lies in the chiasm region and can have a direct impact on the visual field is the: -
CORRECT ANSWER -pituitary gland
The characteristic visual field defect due to a lesion at the chiasm is: - CORRECT ANSWER -
bi temporal hemianopsia (partial blindness in half the visual field)
After nerve fibers cross at the chiasm, they pass next through the: - CORRECT ANSWER -
Optic tract
As the nerve fibers pass through the optic tract, they: - CORRECT ANSWER -
Rotate, thus changing position
After leaving the optic tract, the nerve fibers bundle together at a "relay station" known as the: -
CORRECT ANSWER -Lateral geniculate body
The layers of the lateral geniculate body nucleus are divided so that half of the layers are made
up of crossed fibers, and half are made up of uncrossed fibers. How many layers are there? -
CORRECT ANSWER -Six
Which is not true regarding the nerve fibersRonce they exit the lateral geniculate body? -
CORRECT ANSWER -the tract continues to rotate
Visual nerve fibers terminate at the: - CORRECT ANSWER -occipital cortex
, Visual field defects become more congruous: - CORRECT ANSWER -
The closer the lesion is to the occipital cortex
Sensory input (light impulses) on the patient's left is transmitted to the: - CORRECT ANSWER -
Right side of the brain
The boundary of an area that responds to the same stimulus intensity is called an(n): -
CORRECT ANSWER -Isopter
An area inside a visual field isopter that does not respond to any of the targets available on that
particular machine is termed a: - CORRECT ANSWER -Scotoma
"At threshold" means that the patient responds to a given stimulus in the same area: -
CORRECT ANSWER -50% of the time
An apostilb (obsolete measure of illumination) is a measurement of: - CORRECT ANSWER -
Light intensity
The arbitrary decibel unit is used to denote stimulus intensity in: - CORRECT ANSWER -
Automated perimetry
The decibel unit is considered arbitrary because: - CORRECT ANSWER -
It may differ from one machine to another
The decibel scale is dependent on: - CORRECT ANSWER -
The maximum intensity of the machine's stimulus
The higher the decibel rating: - CORRECT ANSWER -The dimmer the light intensity
Cot Ophthalmology Chapter 4 Visual Fields
Questions with Correct Answers 2025
Each mm on the retina is equal to how many degrees on the visual field? - CORRECT ANSWER -
5 degrees
The light receptor cells of the retina are the: - CORRECT ANSWER -Rods and cones
An object on the patient's right will be perceived by the patient's: - CORRECT ANSWER -
temporal retina OS and nasal retina OD
The nerve fibers are axon extensions of the: - CORRECT ANSWER -Ganglion cells
The autonomic pattern of the nerve fibers produces visual field defects: - CORRECT ANSWER -
That correspond to the location of the nerve fibers
The "blind spot" as plotted on a visual field test corresponds to: - CORRECT ANSWER -
The optic disc
The size of the average blind spot is: - CORRECT ANSWER -
5.5 degrees wide and 7.5 degrees high
On the visual field, the average blind spot is located: - CORRECT ANSWER -
15 degrees temporal to fixation
If you increase the visual field testing distance, the blind spot will: - CORRECT ANSWER -
GetRlarger in cm but remain the same in degrees
,what happens at the optic chasm? - CORRECT ANSWER -
nasal nerve fibers from each eye cross over to the opposite side
The gland that lies in the chiasm region and can have a direct impact on the visual field is the: -
CORRECT ANSWER -pituitary gland
The characteristic visual field defect due to a lesion at the chiasm is: - CORRECT ANSWER -
bi temporal hemianopsia (partial blindness in half the visual field)
After nerve fibers cross at the chiasm, they pass next through the: - CORRECT ANSWER -
Optic tract
As the nerve fibers pass through the optic tract, they: - CORRECT ANSWER -
Rotate, thus changing position
After leaving the optic tract, the nerve fibers bundle together at a "relay station" known as the: -
CORRECT ANSWER -Lateral geniculate body
The layers of the lateral geniculate body nucleus are divided so that half of the layers are made
up of crossed fibers, and half are made up of uncrossed fibers. How many layers are there? -
CORRECT ANSWER -Six
Which is not true regarding the nerve fibersRonce they exit the lateral geniculate body? -
CORRECT ANSWER -the tract continues to rotate
Visual nerve fibers terminate at the: - CORRECT ANSWER -occipital cortex
, Visual field defects become more congruous: - CORRECT ANSWER -
The closer the lesion is to the occipital cortex
Sensory input (light impulses) on the patient's left is transmitted to the: - CORRECT ANSWER -
Right side of the brain
The boundary of an area that responds to the same stimulus intensity is called an(n): -
CORRECT ANSWER -Isopter
An area inside a visual field isopter that does not respond to any of the targets available on that
particular machine is termed a: - CORRECT ANSWER -Scotoma
"At threshold" means that the patient responds to a given stimulus in the same area: -
CORRECT ANSWER -50% of the time
An apostilb (obsolete measure of illumination) is a measurement of: - CORRECT ANSWER -
Light intensity
The arbitrary decibel unit is used to denote stimulus intensity in: - CORRECT ANSWER -
Automated perimetry
The decibel unit is considered arbitrary because: - CORRECT ANSWER -
It may differ from one machine to another
The decibel scale is dependent on: - CORRECT ANSWER -
The maximum intensity of the machine's stimulus
The higher the decibel rating: - CORRECT ANSWER -The dimmer the light intensity
