COT Contact Lens Review Questions With Complete Solutions
which of the following medications may affect successful contact lens wear? - (ANSWER)Antihistamines
Which term refers to sensitivity to light - (ANSWER)Photophobia
This following is an example of what type of astigmatism
K's 42.50F@ .50@90 - (ANSWER)Against-The-Rule Astigmatism
The Cornea receives nutrients from - (ANSWER)Aqueous humor, Tears, Limbal blood vessels
The increased loss of ability of the crystalline lens to accommodate is called - (ANSWER)Presbyopia
Which instrument can provide simultaneous information about the cornea, lids, conjunctiva, lashes,
contact lens surface and fit? - (ANSWER)Slit lamp
The classic model of the pre-corneal tear film is composed of three layers. They are: - (ANSWER)lipid,
aqueous, Mucin
Transpose the following rx into minus cylinder form
-4.50 + 1.25 X 94 - (ANSWER)-3.25 -1.25 X 4
The average pH value of the human tear is - (ANSWER)7.4
If the manufacturer's guidelines suggest a minimum of 4 hours for disinfection, what would you suggest
to the patient? - (ANSWER)A minimum of 4 hours is required
The main supply of oxygen to the corneal epithelium is derived from the - (ANSWER)Tear film
What is the term for the condition in which there is a loss of vision without any apparent disease to the
eye? - (ANSWER)Amblyopia
,COT Contact Lens Review Questions With Complete Solutions
Which auxiliary trial lens will extend the keratometer range to approximately 30.00 D? - (ANSWER)-
1.00D
Which step should be performed first when taking keratometer measurements - (ANSWER)Focus the
eyepeice
The following is an example of what type of astigmatism
K's 44.00@ .50 @ 90
Rx -3.00-2.50 x 180 - (ANSWER)lenticular astigmatism
Ocular signs of aging include: - (ANSWER)Tear film Abnormalities, Reduced lid elasticity, lens opacities,
loss of accommodation
Transpose the following Rx into minus cylinder form:
+1.50+1.00 x 75 - (ANSWER)+2.50-1.00 x 165
The pre-corneal tear film provides: - (ANSWER)A smooth optical surface, Metabolic nutrients to the
epithelium
The cornea has five distinct layers. In order from anterior to posterior they are: - (ANSWER)Epithelium,
Bowman's layer, Stroma, Descemet's membrane, Endothelium
The normal cornea is transparent due to the pump action creating proper fluid balance. Which layer of
the cornea is most responsible for maintaining this function? - (ANSWER)Endothelium
A normal tear break-up time is: - (ANSWER)10-12 seconds
A whitish haze in the peripheral corneal stroma which does not stain and is often seen in the elderly is
know as: - (ANSWER)Arcus Senilus
, COT Contact Lens Review Questions With Complete Solutions
Patients with keratitis sicca are more prone to? - (ANSWER)Secondary infections
Upon removal of the crystalline lens, the patient is - (ANSWER)Aphakic
The following Rx represents
OD +2.00 = 20/20
OS -3.00-2.00 x 180 = 20/20 - (ANSWER)Anisometropia
The patient in the previous question will best achieve stereopsis with which of the following modalities?
- (ANSWER)Contact Lenses
Tom's spectacles with a power of -12.00+0.50 x 090, sit 10 mm in front of his cornea. The likely soft
Contact lens prescription for Tom would be? - (ANSWER)-10.50
The keratometer is an instrument used to measure - (ANSWER)Corneal curvature
The average life span of corneal epithelial cell from mitosis through maturation and desquamation most
nearly approximates? - (ANSWER)One week
Which auxiliary trial lens will extend the keratometer range to approximately 61.00 D? - (ANSWER)+1.25
Wearing lenses in high altitudes and dry environments may result in complaints of all but the following?
- (ANSWER)Chalazion
The first line of defense on the protective system of the eye is formed by the: - (ANSWER)Eyelids
Transient keratometric mire distortion is usually due to ? - (ANSWER)Pre - ocular tear film
which of the following medications may affect successful contact lens wear? - (ANSWER)Antihistamines
Which term refers to sensitivity to light - (ANSWER)Photophobia
This following is an example of what type of astigmatism
K's 42.50F@ .50@90 - (ANSWER)Against-The-Rule Astigmatism
The Cornea receives nutrients from - (ANSWER)Aqueous humor, Tears, Limbal blood vessels
The increased loss of ability of the crystalline lens to accommodate is called - (ANSWER)Presbyopia
Which instrument can provide simultaneous information about the cornea, lids, conjunctiva, lashes,
contact lens surface and fit? - (ANSWER)Slit lamp
The classic model of the pre-corneal tear film is composed of three layers. They are: - (ANSWER)lipid,
aqueous, Mucin
Transpose the following rx into minus cylinder form
-4.50 + 1.25 X 94 - (ANSWER)-3.25 -1.25 X 4
The average pH value of the human tear is - (ANSWER)7.4
If the manufacturer's guidelines suggest a minimum of 4 hours for disinfection, what would you suggest
to the patient? - (ANSWER)A minimum of 4 hours is required
The main supply of oxygen to the corneal epithelium is derived from the - (ANSWER)Tear film
What is the term for the condition in which there is a loss of vision without any apparent disease to the
eye? - (ANSWER)Amblyopia
,COT Contact Lens Review Questions With Complete Solutions
Which auxiliary trial lens will extend the keratometer range to approximately 30.00 D? - (ANSWER)-
1.00D
Which step should be performed first when taking keratometer measurements - (ANSWER)Focus the
eyepeice
The following is an example of what type of astigmatism
K's 44.00@ .50 @ 90
Rx -3.00-2.50 x 180 - (ANSWER)lenticular astigmatism
Ocular signs of aging include: - (ANSWER)Tear film Abnormalities, Reduced lid elasticity, lens opacities,
loss of accommodation
Transpose the following Rx into minus cylinder form:
+1.50+1.00 x 75 - (ANSWER)+2.50-1.00 x 165
The pre-corneal tear film provides: - (ANSWER)A smooth optical surface, Metabolic nutrients to the
epithelium
The cornea has five distinct layers. In order from anterior to posterior they are: - (ANSWER)Epithelium,
Bowman's layer, Stroma, Descemet's membrane, Endothelium
The normal cornea is transparent due to the pump action creating proper fluid balance. Which layer of
the cornea is most responsible for maintaining this function? - (ANSWER)Endothelium
A normal tear break-up time is: - (ANSWER)10-12 seconds
A whitish haze in the peripheral corneal stroma which does not stain and is often seen in the elderly is
know as: - (ANSWER)Arcus Senilus
, COT Contact Lens Review Questions With Complete Solutions
Patients with keratitis sicca are more prone to? - (ANSWER)Secondary infections
Upon removal of the crystalline lens, the patient is - (ANSWER)Aphakic
The following Rx represents
OD +2.00 = 20/20
OS -3.00-2.00 x 180 = 20/20 - (ANSWER)Anisometropia
The patient in the previous question will best achieve stereopsis with which of the following modalities?
- (ANSWER)Contact Lenses
Tom's spectacles with a power of -12.00+0.50 x 090, sit 10 mm in front of his cornea. The likely soft
Contact lens prescription for Tom would be? - (ANSWER)-10.50
The keratometer is an instrument used to measure - (ANSWER)Corneal curvature
The average life span of corneal epithelial cell from mitosis through maturation and desquamation most
nearly approximates? - (ANSWER)One week
Which auxiliary trial lens will extend the keratometer range to approximately 61.00 D? - (ANSWER)+1.25
Wearing lenses in high altitudes and dry environments may result in complaints of all but the following?
- (ANSWER)Chalazion
The first line of defense on the protective system of the eye is formed by the: - (ANSWER)Eyelids
Transient keratometric mire distortion is usually due to ? - (ANSWER)Pre - ocular tear film
