COA (Optometry) STUDY GUIDE LATEST
UPDATED AND RATED A.
Name the two measurements required to determine the dioptric power of the
intraocular lens.
A-scan (axial length of the eye) and keratometry (corneal curvature)
When performing A'scan biometry, a 1mm error in axial length may result in a
_______ diopter calculated IOL power error.
Three
What is the term for the amount of time it takes for dry spots to form on the
cornea when the eye is in staring position?
BUT (break-up time)
Checking the calibration of a Goldmann applanation tonometer is performed
with a _______.
Balance or calibration rod
The Goldmann applanation tonometer prism is best cleaned between patients
with _______.
Hydrogen peroxide soaks or 1:10 bleach solution
Which dye solution is used when performing Goldmann applanation?
Fluorescein dye
What is the diameter of the corneal area properly applanated by a Goldmann
tonometer?
3.06mm
Measuring intraocular pressure is also called _______.
Tonometry
The higher the intraocular pressure of an eye, the _______ the eye.
Harder
,Applanation tonometry displaces less than _______ of aqueous.
0.5 microliters
When recording intraocular pressure, the reading on the Goldmann applanation
tonometer scale should be multiplied by _______.
Ten
What is the normal range of intraocular pressure?
13-20 mm Hg
Which method of tonometry is described as the measurement of the amount of
pressure needed to flatten the cornea by a standard amount?
Applanation tonometry
What measurement error is produced when the fluorescein rings are too narrow
during applanation tonometry?
Falsely low reading
What measurement error is introduced when a patient, holding his/her breath or
wearing a collar that is buttoned too tightly, is applanated?
Falsely high reading
The visual acuity notation 20/200 indicates the patient could see the 200
optotype at _______ feet
Twenty (20)
If the patient perceives light and can indicate the source direction, the vision is
recorded as _______.
Light perception with projection (LPw/P)
The distance of 20 feet is used in visual acuity assessment because it
approximates _______.
Optical infinity
A visual acuity value of 20/40 is expressed as the metric equivalent _______.
6/12
, The pinhole acuity test is used to confirm whether a _______ is the cause of a
decrease in visual acuity.
Refractive error
Jaeger notation, the point system and the Snellen M Unit are units of measure
used in recording _______ visual acuity.
Near
In visual assessment the acronym PAM represents the principal testing device
known as the _______.
Potential acuity meter
The ability of human vision to discern shapes by their relative lightness and
darkness is termed _______.
Contrast sensitivity
During visual acuity assessment the patient is able to clearly read the 20/20 line
but misses one letter, the acuity is recorded as _______.
20/20 - 1
Why is it important to observe the patient during visual acuity testing?
To ensure proper occlusion
While assessing visual acuity the assistant notes the patient consistently misses
the optotypes on the temporal side of the chart, indicating a possible _______
Visual field defect
In visual acuity assessment the brightness acuity tester (BAT) is used to
evaluate _______ when there are opacities in the ocular media.
Glare
In patients with nystagmus visual acuity often improves dramatically when
vision is assessed _______.
Binocularly
At what distance are adult near visual acuity charts designed to be read?
14-16 inches from the eye
UPDATED AND RATED A.
Name the two measurements required to determine the dioptric power of the
intraocular lens.
A-scan (axial length of the eye) and keratometry (corneal curvature)
When performing A'scan biometry, a 1mm error in axial length may result in a
_______ diopter calculated IOL power error.
Three
What is the term for the amount of time it takes for dry spots to form on the
cornea when the eye is in staring position?
BUT (break-up time)
Checking the calibration of a Goldmann applanation tonometer is performed
with a _______.
Balance or calibration rod
The Goldmann applanation tonometer prism is best cleaned between patients
with _______.
Hydrogen peroxide soaks or 1:10 bleach solution
Which dye solution is used when performing Goldmann applanation?
Fluorescein dye
What is the diameter of the corneal area properly applanated by a Goldmann
tonometer?
3.06mm
Measuring intraocular pressure is also called _______.
Tonometry
The higher the intraocular pressure of an eye, the _______ the eye.
Harder
,Applanation tonometry displaces less than _______ of aqueous.
0.5 microliters
When recording intraocular pressure, the reading on the Goldmann applanation
tonometer scale should be multiplied by _______.
Ten
What is the normal range of intraocular pressure?
13-20 mm Hg
Which method of tonometry is described as the measurement of the amount of
pressure needed to flatten the cornea by a standard amount?
Applanation tonometry
What measurement error is produced when the fluorescein rings are too narrow
during applanation tonometry?
Falsely low reading
What measurement error is introduced when a patient, holding his/her breath or
wearing a collar that is buttoned too tightly, is applanated?
Falsely high reading
The visual acuity notation 20/200 indicates the patient could see the 200
optotype at _______ feet
Twenty (20)
If the patient perceives light and can indicate the source direction, the vision is
recorded as _______.
Light perception with projection (LPw/P)
The distance of 20 feet is used in visual acuity assessment because it
approximates _______.
Optical infinity
A visual acuity value of 20/40 is expressed as the metric equivalent _______.
6/12
, The pinhole acuity test is used to confirm whether a _______ is the cause of a
decrease in visual acuity.
Refractive error
Jaeger notation, the point system and the Snellen M Unit are units of measure
used in recording _______ visual acuity.
Near
In visual assessment the acronym PAM represents the principal testing device
known as the _______.
Potential acuity meter
The ability of human vision to discern shapes by their relative lightness and
darkness is termed _______.
Contrast sensitivity
During visual acuity assessment the patient is able to clearly read the 20/20 line
but misses one letter, the acuity is recorded as _______.
20/20 - 1
Why is it important to observe the patient during visual acuity testing?
To ensure proper occlusion
While assessing visual acuity the assistant notes the patient consistently misses
the optotypes on the temporal side of the chart, indicating a possible _______
Visual field defect
In visual acuity assessment the brightness acuity tester (BAT) is used to
evaluate _______ when there are opacities in the ocular media.
Glare
In patients with nystagmus visual acuity often improves dramatically when
vision is assessed _______.
Binocularly
At what distance are adult near visual acuity charts designed to be read?
14-16 inches from the eye
