COT Contact Lens Review Questions
And Full Set Correct Solutions| F-Alt 2
which of the following medications may affect successful contact lens
wear? - Ans--Antihistamines
Which term refers to sensitivity to light - Ans--Photophobia
This following is an example of what type of astigmatism
K's 42.50F@ .50@90 - Ans--Against-The-Rule Astigmatism
The Cornea receives nutrients from - Ans--Aqueous humor, Tears, Limbal
blood vessels
The increased loss of ability of the crystalline lens to accommodate is called
- Ans--Presbyopia
Which instrument can provide simultaneous information about the cornea,
lids, conjunctiva, lashes, contact lens surface and fit? - Ans--Slit lamp
The classic model of the pre-corneal tear film is composed of three layers.
They are: - Ans--lipid, aqueous, Mucin
Transpose the following rx into minus cylinder form
-4.50 + 1.25 X 94 - Ans---3.25 -1.25 X 4
The average pH value of the human tear is - Ans--7.4
If the manufacturer's guidelines suggest a minimum of 4 hours for
disinfection, what would you suggest to the patient? - Ans--A minimum of 4
hours is required
The main supply of oxygen to the corneal epithelium is derived from the -
Ans--Tear film
,What is the term for the condition in which there is a loss of vision without
any apparent disease to the eye? - Ans--Amblyopia
Which auxiliary trial lens will extend the keratometer range to approximately
30.00 D? - Ans---1.00D
Which step should be performed first when taking keratometer
measurements - Ans--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 - Ans--lenticular astigmatism
Ocular signs of aging include: - Ans--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 - Ans--+2.50-1.00 x 165
The pre-corneal tear film provides: - Ans--A smooth optical surface,
Metabolic nutrients to the epithelium
The cornea has five distinct layers. In order from anterior to posterior they
are: - Ans--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? - Ans--Endothelium
A normal tear break-up time is: - Ans--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: - Ans--Arcus Senilus
Patients with keratitis sicca are more prone to? - Ans--Secondary infections
Upon removal of the crystalline lens, the patient is - Ans--Aphakic
, The following Rx represents
OD +2.00 = 20/20
OS -3.00-2.00 x 180 = 20/20 - Ans--Anisometropia
The patient in the previous question will best achieve stereopsis with which
of the following modalities? - Ans--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? - Ans---
10.50
The keratometer is an instrument used to measure - Ans--Corneal
curvature
The average life span of corneal epithelial cell from mitosis through
maturation and desquamation most nearly approximates? - Ans--One
week
Which auxiliary trial lens will extend the keratometer range to approximately
61.00 D? - Ans--+1.25
Wearing lenses in high altitudes and dry environments may result in
complaints of all but the following? - Ans--Chalazion
The first line of defense on the protective system of the eye is formed by the:
- Ans--Eyelids
Transient keratometric mire distortion is usually due to ? - Ans--Pre - ocular
tear film
In against-the-rule astigmatism, the steepest corneal meridian? - Ans--Is at
or near 180 degrees
An inability to bring all of the keratometer mires into focus at the same time
may indicate? - Ans--Irregular astigmatism
And Full Set Correct Solutions| F-Alt 2
which of the following medications may affect successful contact lens
wear? - Ans--Antihistamines
Which term refers to sensitivity to light - Ans--Photophobia
This following is an example of what type of astigmatism
K's 42.50F@ .50@90 - Ans--Against-The-Rule Astigmatism
The Cornea receives nutrients from - Ans--Aqueous humor, Tears, Limbal
blood vessels
The increased loss of ability of the crystalline lens to accommodate is called
- Ans--Presbyopia
Which instrument can provide simultaneous information about the cornea,
lids, conjunctiva, lashes, contact lens surface and fit? - Ans--Slit lamp
The classic model of the pre-corneal tear film is composed of three layers.
They are: - Ans--lipid, aqueous, Mucin
Transpose the following rx into minus cylinder form
-4.50 + 1.25 X 94 - Ans---3.25 -1.25 X 4
The average pH value of the human tear is - Ans--7.4
If the manufacturer's guidelines suggest a minimum of 4 hours for
disinfection, what would you suggest to the patient? - Ans--A minimum of 4
hours is required
The main supply of oxygen to the corneal epithelium is derived from the -
Ans--Tear film
,What is the term for the condition in which there is a loss of vision without
any apparent disease to the eye? - Ans--Amblyopia
Which auxiliary trial lens will extend the keratometer range to approximately
30.00 D? - Ans---1.00D
Which step should be performed first when taking keratometer
measurements - Ans--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 - Ans--lenticular astigmatism
Ocular signs of aging include: - Ans--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 - Ans--+2.50-1.00 x 165
The pre-corneal tear film provides: - Ans--A smooth optical surface,
Metabolic nutrients to the epithelium
The cornea has five distinct layers. In order from anterior to posterior they
are: - Ans--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? - Ans--Endothelium
A normal tear break-up time is: - Ans--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: - Ans--Arcus Senilus
Patients with keratitis sicca are more prone to? - Ans--Secondary infections
Upon removal of the crystalline lens, the patient is - Ans--Aphakic
, The following Rx represents
OD +2.00 = 20/20
OS -3.00-2.00 x 180 = 20/20 - Ans--Anisometropia
The patient in the previous question will best achieve stereopsis with which
of the following modalities? - Ans--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? - Ans---
10.50
The keratometer is an instrument used to measure - Ans--Corneal
curvature
The average life span of corneal epithelial cell from mitosis through
maturation and desquamation most nearly approximates? - Ans--One
week
Which auxiliary trial lens will extend the keratometer range to approximately
61.00 D? - Ans--+1.25
Wearing lenses in high altitudes and dry environments may result in
complaints of all but the following? - Ans--Chalazion
The first line of defense on the protective system of the eye is formed by the:
- Ans--Eyelids
Transient keratometric mire distortion is usually due to ? - Ans--Pre - ocular
tear film
In against-the-rule astigmatism, the steepest corneal meridian? - Ans--Is at
or near 180 degrees
An inability to bring all of the keratometer mires into focus at the same time
may indicate? - Ans--Irregular astigmatism
