ODP: Contact Lens Pre-Final Assessment 1
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What staining pattern will have a large break or area of erosion? - CORRECT ANSWER -
Abrasion
What is the index of refraction of the cornea? - CORRECT ANSWER - 1.376
What is the typical optical zone diameter of a corneal alignment fit? - CORRECT
ANSWER - 8.0 mm
What are the layers of the corneal from inside out? - CORRECT ANSWER - Endothelium,
Descemet's membrane, Stroma, Bowman's Layer, Epithelium
Who Will Likely need corrective lenses at a younger age? - CORRECT ANSWER -A
myope
Where can the chemical make-up of a hydrogel lens be found? - CORRECT ANSWER -
Package insert
How long should a soft lens be allowed to settle on the eye before evaluation the fit? -
CORRECT ANSWER - At lest 20 minutes
Scleral lenses should be inserted: - CORRECT ANSWER - Directly on the cornea
What type of astigmatism may be revealed when a rigid contact lens is applied? - CORRECT
ANSWER - Lenticular
, At what power do you make adjustments for vertex distance? - CORRECT ANSWER -+
or - 4.00
How can a flat cornea, even down to 31.00 diopters, be measured? - CORRECT
ANSWER - With the use of a -1.00 trial lens
What instrument is used to determine the power of a rigid contact? - CORRECT
ANSWER - Lensometer
What is the primary funtion of the digital corneal topographer? - CORRECT ANSWER -
Measure the curvature of the cornea
A special lens with a soft holder lens and a rigid center used to treat keratoconus is called: -
CORRECT ANSWER - The piggyback
What is a reason to choose a higher DK fluorocarbon material over soft hydrogel? - CORRECT
ANSWER - They are durable and require less requent replacement
F.E. Muller provided a lens or "glass shell" to Dr. Theodor Samisch to treat what condition? -
CORRECT ANSWER - Loss of the upper lid
The first company to market soft contacts is the US: - CORRECT ANSWER - Bausch and
Lomb
What are the layers of the tear film from outside in? - CORRECT ANSWER - Lipid,
Aqueous, Mucin
What is the index of refraction of glass if light travels through the glass at a speed of 133,000
mi/sec: - CORRECT ANSWER - 1.398
Before 1930 what material was used for contact lenses? - CORRECT ANSWER - Glass
UPDATED ACTUAL Exam Questions and
CORRECT Answers
What staining pattern will have a large break or area of erosion? - CORRECT ANSWER -
Abrasion
What is the index of refraction of the cornea? - CORRECT ANSWER - 1.376
What is the typical optical zone diameter of a corneal alignment fit? - CORRECT
ANSWER - 8.0 mm
What are the layers of the corneal from inside out? - CORRECT ANSWER - Endothelium,
Descemet's membrane, Stroma, Bowman's Layer, Epithelium
Who Will Likely need corrective lenses at a younger age? - CORRECT ANSWER -A
myope
Where can the chemical make-up of a hydrogel lens be found? - CORRECT ANSWER -
Package insert
How long should a soft lens be allowed to settle on the eye before evaluation the fit? -
CORRECT ANSWER - At lest 20 minutes
Scleral lenses should be inserted: - CORRECT ANSWER - Directly on the cornea
What type of astigmatism may be revealed when a rigid contact lens is applied? - CORRECT
ANSWER - Lenticular
, At what power do you make adjustments for vertex distance? - CORRECT ANSWER -+
or - 4.00
How can a flat cornea, even down to 31.00 diopters, be measured? - CORRECT
ANSWER - With the use of a -1.00 trial lens
What instrument is used to determine the power of a rigid contact? - CORRECT
ANSWER - Lensometer
What is the primary funtion of the digital corneal topographer? - CORRECT ANSWER -
Measure the curvature of the cornea
A special lens with a soft holder lens and a rigid center used to treat keratoconus is called: -
CORRECT ANSWER - The piggyback
What is a reason to choose a higher DK fluorocarbon material over soft hydrogel? - CORRECT
ANSWER - They are durable and require less requent replacement
F.E. Muller provided a lens or "glass shell" to Dr. Theodor Samisch to treat what condition? -
CORRECT ANSWER - Loss of the upper lid
The first company to market soft contacts is the US: - CORRECT ANSWER - Bausch and
Lomb
What are the layers of the tear film from outside in? - CORRECT ANSWER - Lipid,
Aqueous, Mucin
What is the index of refraction of glass if light travels through the glass at a speed of 133,000
mi/sec: - CORRECT ANSWER - 1.398
Before 1930 what material was used for contact lenses? - CORRECT ANSWER - Glass
