ODP: Contact Lens Pre-final Assessment 2 | Questions and
Answers
A reason to choose a higher DK fluorocarbon material over soft hydrogel is: ** Answ**
They are durable and require less frequent replacement
What material was used by Thomas Young to affix water filled lenses to his eyes? ** Answ**
Wax
What is the final view seen in the radiuscope before reading the scale? ** Answ** The spoke
pattern
What is a way to test to see if a lens is inverted? ** Answ** Taco test
When filling a patient with Spectacle Rx -4.00 -1.25 x 80, a diagnostic soft contact lens of -4.00 -
1.25 x 90 rotates clockwise 10 degrees. What axis should be ordered? ** Answ** 90 degrees
How much of the information do most people remember? ** Answ** 25%
Which of these considerations will help the fitter to best advise a patient? ** Answ**
Possible previous use of contact lenses
What are the layers of the Cornea outside in? ** Answ** Epithelium, Bowman's layer,
stroma, Descemet's membrane, and endothelium
What is the index of refraction for the Aqueous and Vitreous? ** Answ** 1.336
What is the drooping of the upper lid called? ** Answ** Ptosis
What instrument is used to determine a good fit of contacts? ** Answ** slit lamp
How can a flat cornea down to even 31.00 diopters be measured? ** Answ** With the use of
a -1.00 trial lens
What do the colors on a topographic map usually symbolize? ** Answ** Red represents the
steer regions and blue represents the flatter regions
What is the inflammation of the lacrimal gland? ** Answ** Dacryoadentis
What is the term to describe a moderate to high refractive difference in powers? ** Answ**
Anisometropia
, A patient refracted at a vertex distance of 13mm has a spectacle Rx of -1.00 -2.00 x 160 and K's
of 42.50 @.50 @70. A rigid lens with a back surface radius of 7.94 is placed on the eye.
The expected power of the contact lens needed would be: ** Answ** -1.00
Contact lenses are classified as: ** Answ** Medical devices
What does HIPAA Stand for? ** Answ** Health Insurance Portability and Accountability
Act
What can cause GPC? ** Answ** Heavy deposits on lenses
A plus power is best used for: ** Answ** Hyperopia
What fitting method is best used for a patient with Keratoconus? ** Answ** Diagnostic
Fitting set
What is the astigmatism for the Rx -.050 -4.50 x 90? ** Answ** With the rule
What is a chronic, auto-immune disorder characterized by monocular cell infiltration of the
lacrimal and salivary glands? ** Answ** Sjogren's Syndrome
Which profession is a contraindication for contact lenses? ** Answ** Mechanic
What is the inflammation of the eyelid margin? ** Answ** Blepharitis
Express the Base curve of 39.50 diopters in millimeters. ** Answ** 8.54
K readings are based on: ** Answ** The measurement of the curvature of the cornea
What is the typical magnification power range available on a slit lamp? ** Answ** 6 to 40
times
When fitting with a rigid gas permeable contact what is a good diameter to start with? **
Answ** 9.5
An enlarged thyroid gland can cause: ** Answ** Exophthalmos
What instrument is used to determine the base curve of a rigid contact? ** Answ**
Radiuscope
if a patient's refractive cylinder axis is 180 degrees and the lens marking 3 minutes to the fitters
left, what axis should you order? ** Answ** 20
Tear deficiencies may cause: ** Answ** Dry eyes
Answers
A reason to choose a higher DK fluorocarbon material over soft hydrogel is: ** Answ**
They are durable and require less frequent replacement
What material was used by Thomas Young to affix water filled lenses to his eyes? ** Answ**
Wax
What is the final view seen in the radiuscope before reading the scale? ** Answ** The spoke
pattern
What is a way to test to see if a lens is inverted? ** Answ** Taco test
When filling a patient with Spectacle Rx -4.00 -1.25 x 80, a diagnostic soft contact lens of -4.00 -
1.25 x 90 rotates clockwise 10 degrees. What axis should be ordered? ** Answ** 90 degrees
How much of the information do most people remember? ** Answ** 25%
Which of these considerations will help the fitter to best advise a patient? ** Answ**
Possible previous use of contact lenses
What are the layers of the Cornea outside in? ** Answ** Epithelium, Bowman's layer,
stroma, Descemet's membrane, and endothelium
What is the index of refraction for the Aqueous and Vitreous? ** Answ** 1.336
What is the drooping of the upper lid called? ** Answ** Ptosis
What instrument is used to determine a good fit of contacts? ** Answ** slit lamp
How can a flat cornea down to even 31.00 diopters be measured? ** Answ** With the use of
a -1.00 trial lens
What do the colors on a topographic map usually symbolize? ** Answ** Red represents the
steer regions and blue represents the flatter regions
What is the inflammation of the lacrimal gland? ** Answ** Dacryoadentis
What is the term to describe a moderate to high refractive difference in powers? ** Answ**
Anisometropia
, A patient refracted at a vertex distance of 13mm has a spectacle Rx of -1.00 -2.00 x 160 and K's
of 42.50 @.50 @70. A rigid lens with a back surface radius of 7.94 is placed on the eye.
The expected power of the contact lens needed would be: ** Answ** -1.00
Contact lenses are classified as: ** Answ** Medical devices
What does HIPAA Stand for? ** Answ** Health Insurance Portability and Accountability
Act
What can cause GPC? ** Answ** Heavy deposits on lenses
A plus power is best used for: ** Answ** Hyperopia
What fitting method is best used for a patient with Keratoconus? ** Answ** Diagnostic
Fitting set
What is the astigmatism for the Rx -.050 -4.50 x 90? ** Answ** With the rule
What is a chronic, auto-immune disorder characterized by monocular cell infiltration of the
lacrimal and salivary glands? ** Answ** Sjogren's Syndrome
Which profession is a contraindication for contact lenses? ** Answ** Mechanic
What is the inflammation of the eyelid margin? ** Answ** Blepharitis
Express the Base curve of 39.50 diopters in millimeters. ** Answ** 8.54
K readings are based on: ** Answ** The measurement of the curvature of the cornea
What is the typical magnification power range available on a slit lamp? ** Answ** 6 to 40
times
When fitting with a rigid gas permeable contact what is a good diameter to start with? **
Answ** 9.5
An enlarged thyroid gland can cause: ** Answ** Exophthalmos
What instrument is used to determine the base curve of a rigid contact? ** Answ**
Radiuscope
if a patient's refractive cylinder axis is 180 degrees and the lens marking 3 minutes to the fitters
left, what axis should you order? ** Answ** 20
Tear deficiencies may cause: ** Answ** Dry eyes
