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A Correct Statement regarding epithelial cells is that they: a)Comprise the posterior layer of the cornea b)Are unable to regenerate c)Comprise the thickest layer of the cornea d) Have the ability to reproduce - ANSWER d) have the ability to reproduce Which of the following prescriptions in...
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Add to cartA Correct Statement regarding epithelial cells is that they: a)Comprise the posterior layer of the cornea b)Are unable to regenerate c)Comprise the thickest layer of the cornea d) Have the ability to reproduce - ANSWER d) have the ability to reproduce Which of the following prescriptions in...
Assessment of the quality of the peripheral curves (blends of a rigid contact lens) is achieved by the use of the- a. profile analyzer b. shadow graph c. keratometer d. burton light - ANSWER a. profile analyzer Contact lens power should be specified in- a. back vertex power b. sphero-cylind...
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Add to cartAssessment of the quality of the peripheral curves (blends of a rigid contact lens) is achieved by the use of the- a. profile analyzer b. shadow graph c. keratometer d. burton light - ANSWER a. profile analyzer Contact lens power should be specified in- a. back vertex power b. sphero-cylind...
base curve - ANSWER refers to the radius of curvature of the central posterior surface of the lens. It may be expressed in diopters of surface power (D) or in millimeters (mm) of radius or curvature. optical zone - ANSWER the chord diameter over which the base curve extends on the posterior surfa...
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Add to cartbase curve - ANSWER refers to the radius of curvature of the central posterior surface of the lens. It may be expressed in diopters of surface power (D) or in millimeters (mm) of radius or curvature. optical zone - ANSWER the chord diameter over which the base curve extends on the posterior surfa...
Steep Fluorescein Pattern - ANSWER Bright green pooling center, very faint green pooling on diameter of lens Flat Fluorescein Pattern - ANSWER Bright green pooling on diameter of lens, very faint green in center Against-the-rule Astigmatism Pattern - ANSWER Bright green pooling horizontally, f...
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Add to cartSteep Fluorescein Pattern - ANSWER Bright green pooling center, very faint green pooling on diameter of lens Flat Fluorescein Pattern - ANSWER Bright green pooling on diameter of lens, very faint green in center Against-the-rule Astigmatism Pattern - ANSWER Bright green pooling horizontally, f...
Hydrogen peroxide care systems: A. Should not be used to disinfect FDA group IV lenses. B. Is more effective against viruses and fungi than most chemical disinfection systems. C. Does not require a red tip on its container, since it does not cause permanent damage if accidental. D. Takes a minim...
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Add to cartHydrogen peroxide care systems: A. Should not be used to disinfect FDA group IV lenses. B. Is more effective against viruses and fungi than most chemical disinfection systems. C. Does not require a red tip on its container, since it does not cause permanent damage if accidental. D. Takes a minim...
antihistamines - ANSWER are beneficial when treating allergies and cold symptoms because they dry out the mucous membranes of the nasal passage. However, this may also lead to dehydration of the tear film, they are also been known to slow down the blink rate and increase corneal sensitivity. agai...
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Add to cartantihistamines - ANSWER are beneficial when treating allergies and cold symptoms because they dry out the mucous membranes of the nasal passage. However, this may also lead to dehydration of the tear film, they are also been known to slow down the blink rate and increase corneal sensitivity. agai...
Pre-ocular tear film - ANSWER Transient keratometric mire distortion Tear Film - ANSWER The main supply of oxygen to the corneal epithelium is derived from the Which auxiliary trial lens will extend the keratometer range to approximately 30.00D - ANSWER -1.00 A smooth optical surface and Me...
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Add to cartPre-ocular tear film - ANSWER Transient keratometric mire distortion Tear Film - ANSWER The main supply of oxygen to the corneal epithelium is derived from the Which auxiliary trial lens will extend the keratometer range to approximately 30.00D - ANSWER -1.00 A smooth optical surface and Me...
optic zone - ANSWER the central portion of a contact lens which contains the refractive power and generally corresponds to the central corneal cap posterior apecal radius - ANSWER this term is generally used in reference to spin-cast soft lenses. the curvature of the posterior surface of the lens...
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Add to cartoptic zone - ANSWER the central portion of a contact lens which contains the refractive power and generally corresponds to the central corneal cap posterior apecal radius - ANSWER this term is generally used in reference to spin-cast soft lenses. the curvature of the posterior surface of the lens...
The tear film consists of which the following? a. aqueous layer b. conjunctiva c. lipid film d. mucin film - ANSWER a c d The primary function of the mucin film is to: change the corneal epithelial surface from a "_________ surface to a ___________ surface" - ANSWER hydrophobic surface ...
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Add to cartThe tear film consists of which the following? a. aqueous layer b. conjunctiva c. lipid film d. mucin film - ANSWER a c d The primary function of the mucin film is to: change the corneal epithelial surface from a "_________ surface to a ___________ surface" - ANSWER hydrophobic surface ...
Which Curve is the Flattest? A) 7.5 mm B) 44.75 D C) 7.6 mm D) 45.50 D - ANSWER 7.6 mm Inflammation of the Eyelids is Called : A) Palpebritis B) Keratitis C) Conjunctivitis D) Blepharitis - ANSWER Blepharitis The Base Curve of a Rigid Lens was Ordered at 7.75 mm but Received a...
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Add to cartWhich Curve is the Flattest? A) 7.5 mm B) 44.75 D C) 7.6 mm D) 45.50 D - ANSWER 7.6 mm Inflammation of the Eyelids is Called : A) Palpebritis B) Keratitis C) Conjunctivitis D) Blepharitis - ANSWER Blepharitis The Base Curve of a Rigid Lens was Ordered at 7.75 mm but Received a...
adnexa - ANSWER extraocular structures of the eye which include the eyelids, the orbit, lacrimal glands anterior chamber - ANSWER the area bounded in front by the cornea and in the back by the lens and filled with aqueous aqueous - ANSWER a clear, watery solution in the anterior and posterior ...
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Add to cartadnexa - ANSWER extraocular structures of the eye which include the eyelids, the orbit, lacrimal glands anterior chamber - ANSWER the area bounded in front by the cornea and in the back by the lens and filled with aqueous aqueous - ANSWER a clear, watery solution in the anterior and posterior ...
Which of the following medications may affect successful contact lens wear? A. Antacids B. Antihistamines C. Aspirin D. Laxatives - ANSWER B. Antihistimines Which term refers to a sensitivity to light? A. Prebyopia B. Photophobia C. Pannus D. Ptosis - ANSWER B. Photophobia The followi...
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Add to cartWhich of the following medications may affect successful contact lens wear? A. Antacids B. Antihistamines C. Aspirin D. Laxatives - ANSWER B. Antihistimines Which term refers to a sensitivity to light? A. Prebyopia B. Photophobia C. Pannus D. Ptosis - ANSWER B. Photophobia The followi...
Test that measures the quality of tears - ANSWER B.U.T. Test (Break up time) What is the O2 Permeability - ANSWER DK values of a lens What are the disadvantages of Soft Lenses? - ANSWER Doesn't correct irregular astigmatism, favors deposit formation Which test measures the quantity of tear...
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Add to cartTest that measures the quality of tears - ANSWER B.U.T. Test (Break up time) What is the O2 Permeability - ANSWER DK values of a lens What are the disadvantages of Soft Lenses? - ANSWER Doesn't correct irregular astigmatism, favors deposit formation Which test measures the quantity of tear...
if the diagnostic rigid gas permeable lens placed on the eye results in minimal movement, which of the following will increase the movement on the lens ordered for the patient? - ANSWER decreasing the overall lens diameter if a soft contact lens decenters laterally, exposing a portion of the pati...
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Add to cartif the diagnostic rigid gas permeable lens placed on the eye results in minimal movement, which of the following will increase the movement on the lens ordered for the patient? - ANSWER decreasing the overall lens diameter if a soft contact lens decenters laterally, exposing a portion of the pati...
Which of the following medications may affect successful contact lens wear? A. Antacids B. Antihistamines C. Aspirin D. Laxatives - ANSWER B. Antihistamines Which term refers to a sensitivity to light? A. Presbyopia B. Photophobia C. Pannus D. Ptosis - ANSWER B. Photophobia The followi...
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Add to cartWhich of the following medications may affect successful contact lens wear? A. Antacids B. Antihistamines C. Aspirin D. Laxatives - ANSWER B. Antihistamines Which term refers to a sensitivity to light? A. Presbyopia B. Photophobia C. Pannus D. Ptosis - ANSWER B. Photophobia The followi...
Diffused Illumination - ANSWER -Uses widest slit, longest aperture -Light source positioned at an angle of 40º-50º -Used to view overall areas, to observe the ocular adnexa, cornea, sclera, lids, conjunctiva, lens surface, and CL fitting characteristics Direct Illumination - ANSWER -Most impo...
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Add to cartDiffused Illumination - ANSWER -Uses widest slit, longest aperture -Light source positioned at an angle of 40º-50º -Used to view overall areas, to observe the ocular adnexa, cornea, sclera, lids, conjunctiva, lens surface, and CL fitting characteristics Direct Illumination - ANSWER -Most impo...
What is the thickest layer of the cornea? - ANSWER stroma Which corneal layer controls the fluid content of the cornea? - ANSWER endothelium What is cornea edema? - ANSWER excess fluid in the stroma that can swell it and lead to loss of visual acuity What kind of contact lenses must be stab...
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Add to cartWhat is the thickest layer of the cornea? - ANSWER stroma Which corneal layer controls the fluid content of the cornea? - ANSWER endothelium What is cornea edema? - ANSWER excess fluid in the stroma that can swell it and lead to loss of visual acuity What kind of contact lenses must be stab...
The answer is D. The posterior optical zone will directly affect the lens to cornea relationship of a rigid gas permeable lens. If the posterior optical zone is steepened, it will increase the sagittal depth. If it is flattened, it will decrease the sagittal depth. Changing the power, which is ac...
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Add to cartThe answer is D. The posterior optical zone will directly affect the lens to cornea relationship of a rigid gas permeable lens. If the posterior optical zone is steepened, it will increase the sagittal depth. If it is flattened, it will decrease the sagittal depth. Changing the power, which is ac...
The tolerance for the overall lens diamter according to the ANSI standards is: A. +/-0.005mm B. +/-0.05mm C. +/-0.01mm D. +/-0.1mm - ANSWER B. According to the ANSI standards (Z80.2-1989), the tolerance for the overall diameter of a contat lens is +/-0.05mm. ANSI standards have been develo...
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Add to cartThe tolerance for the overall lens diamter according to the ANSI standards is: A. +/-0.005mm B. +/-0.05mm C. +/-0.01mm D. +/-0.1mm - ANSWER B. According to the ANSI standards (Z80.2-1989), the tolerance for the overall diameter of a contat lens is +/-0.05mm. ANSI standards have been develo...
The FDA (Food and Drug Administration) - ANSWER ? classifies lens material by how much water is in it and by the electronic charge. The water is either low or high, and percentages are given. The electronic charge is indicated with ionic or non-ionic. The materials are in four groups as follows: ...
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Add to cartThe FDA (Food and Drug Administration) - ANSWER ? classifies lens material by how much water is in it and by the electronic charge. The water is either low or high, and percentages are given. The electronic charge is indicated with ionic or non-ionic. The materials are in four groups as follows: ...
which of the following is not important to document in medical records for contact lens patients? - ANSWER location at which the patient was originally taught insertion and removal which of the following will not increase the movement of a tight fitting rigid gas permeable lens? - ANSWER enlarg...
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Add to cartwhich of the following is not important to document in medical records for contact lens patients? - ANSWER location at which the patient was originally taught insertion and removal which of the following will not increase the movement of a tight fitting rigid gas permeable lens? - ANSWER enlarg...
Which of the following modifications to a rigid gas permeable lens can not be made in the office? A. Blending of peripherals curves B. Addition of minus power C. Polishing lens surface D. Changing the base curve - ANSWER D. Changing the base curve of a rigid gas permeable lens is not possi...
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Add to cartWhich of the following modifications to a rigid gas permeable lens can not be made in the office? A. Blending of peripherals curves B. Addition of minus power C. Polishing lens surface D. Changing the base curve - ANSWER D. Changing the base curve of a rigid gas permeable lens is not possi...
Aqueous layer, mucin layer, lipid layer - ANSWER The tear film consists of which if the following? Primary function of the tear film - ANSWER Change the corneal epithelial surface from a hydrophobic surface to a hydrophilic surface. Prevent evaporation of the tear film - ANSWER The lipid layer...
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Add to cartAqueous layer, mucin layer, lipid layer - ANSWER The tear film consists of which if the following? Primary function of the tear film - ANSWER Change the corneal epithelial surface from a hydrophobic surface to a hydrophilic surface. Prevent evaporation of the tear film - ANSWER The lipid layer...
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