Contact Lens Manual Flashcards
The individual awarded the first patent
for a corneal lens made of PMMA was:
a) Da Vinci
c) Fick
b) Tuohy
d) Soper
b) Tuohy
Until the 1930s, all contact lenses were
made of:
a) plastic
c) gelatin
b) glass
d) CAB
b) glass
Polycon I, the first silacrylate lens, was
developed by:
a) Tuohy
b) Wichterle
c) Wesley
d) Seidner
d) Seidner
The biggest disadvantage of PMMA as a
contact lens material is its lack of:
a) color
b) stability
c) gas permeability
d) optical clarity
c) gas permeability
Bifocal contact lenses have been marketed
in the U.S. since which decade of
the twentieth century?
a) fifties
b) sixties
c) seventies
d) eighties
a) fifties
From the 1930s through the 1960s, the
material of choice for contact lenses was:
a) FSA
b) CAB
c) PMMA
d) HEMA
c) PMMA
The first company to market soft lenses in
the U.S. was:
a) Bausch & Lomb
c) Schott
b) Syntex
d) Obrig
a) Bausch & Lomb
One-day disposable soft lenses became
available in:
a) 1938
b) 1950
c) 1971
d) 1994
d) 1994
The first company to make contact lenses
of PMMA in the U.S. was:
a) Bausch & Lomb
c) Schott
b) Syntex
d) Obrig
d) Obrig
The company responsible for bringing the
soft lens material HEMA to the U.S. was:
a) Tillyer
b) National Patent Development Corp.
c) Bausch & Lomb
d) Johnson & Johnson
b) National Patent Development Corp.
The contact lens pioneer who made
improvements to lens design by inventing
the topogometer to better measure corneal
topography was:
a) Dallos
b) Wichterle
c) Soper
d) Becker
c) Soper
The person considered responsible for
first realizing the concept of corneal
neutralization and replacement by a
“lens” placed in contact with the eye is:
a) Da Vinci
c) Fick
b) Tuohy
d) Soper
a) Da Vinci
The Food and Drug Administration has
been involved in approval of new contact
lens materials since the year:
a) 1950
b) 1968
c) 1971
d) 1978
b)1968
Rigid gas permeable (RGP) contact lenses
have been marketed in the U.S. since
which decade of the twentieth century?
a) fifties
b) sixties
c) seventies
d) eighties
c) seventies
The chemist who invented HEMA is:
a) Dallos
b) Wichterle
c) Soper
d) Becker
b) Wichterle
Which layer of the cornea makes up 10%
of the structure’s total thickness?
a) epithelium
b) Bowman’s membrane
c) endothelium
d) stroma
a) epithelium
The vertical measurement of the palpebral
fissure for an average eye is
__ mm
a) 5
b) 10
c) 15
d) 20
b) 10
The eyelid muscle responsible for closure of the lids is the:
a) dilator pupillae
b) orbicularis oculi
c) levator superioris
d) pectoral blephari
b) orbicularis ocul
The anterior cornea’s main source of oxygen is the
a) atmosphere
b) short posterior ciliary arteries
c) fovea
d) leukoma
a) atmosphere
A dense opacity of the cornea is called
a) dendrite
b) nebula
c) fovea
d) leukoma
d) leukoma
The goblet cells that secrete mucous into the
tear film are located in which structure ?
a) ciliary body
b) retina
c) conjunctiva
d) tarsal plate of the eyelid
c) conjunctiva
The transition zone between the bulbar conjunctiva and the palpebral conjunctiva is called the
a) fundus
b) blend
c) limbus
d) fornix
d) fornix
The middle layer of the three main layers
of the globe is mostly responsible for:
a} nutrition
b) light sensitivity
c} protection
d} ocular motility
a} nutrition
Pupillary constriction is called:
a} cycloplegia
b} esophoria
c} miosis
d} mydriasis
c} miosis
The bacteriocidal ingredient found in the
precorneal tear film is:
a) lysozyme
b} papain
c) sodium chloride
d} lactic acid
a) lysozyme
How many extrinsic muscles are attached
to each eye?
a) 2
b) 4
c) 6
d) 8
c) 6
The fovea centralis of the retina contains:
a} only cones
b} both cones and rods
c} only rods
d} neither cones nor rods
a} only cones
The additive primary colors are:
a) red, white and blue
b) red, green and blue
c} red, yellow and blue
d} orange, green and blue
b) red, green and blue
The bony orbit of the eye is shaped most
like a:
a} ball
b} cube
c} trapezoid
d) pyramid
d) pyramid
The structure that can adjust its focus for
various object positions is the:
a) cornea
b) retina
c) vitreous humor
d) crystalline lens
d) crystalline lens
The term that is used to describe both
eyes moving in the same direction, as
when they both look left or both look
right, is:
a) vergence
c) version
b) vitreous
d) virgule
c) version
The condition where one eye is turned is
called:
a) rubeosis
c) strabismus
b) neovascularization
d) orthophoria
c) strabismus
The most refractive optical component of
the eye is the:
a) retina
b) cornea
c) ciliary body
d) crystalline lens
b) cornea
The main function of the eye’s outer
layer is:
a) protection
b) nutrition
c) illumination
d) light sensation
a) protection
An opacity of the crystalline lens is called
a:
a) melanoma
c) presbyopia
b) pinguecula
d) cataract
d) cataract
Loss of vision caused by excessive intraocular
pressure is called:
a) presbyopia
c) trachoma
b) glaucoma
d) keratitis
b) glaucoma
Which of the following structures would
belong to the adnexa oculi?
a) ciliary muscle
b) optic disc
c) tarsal plate
d) lens zonule
c) tarsal plate
The corneal layer that consists of a single later of hexagonal cells is the
a) epithelium
b) Bowman’s Membrane
c) endothelium
d) stroma
c) endothelium
The transitional area that joins the cornea and the sclera is known as the
a) fundus
b) limbus
c) aqueous
d) strabismus
b) limbus
The levator superioris muscle:
a) raises the upper lid
b) creates intorsion
c) raises the eyeball
d) coordinates both eyes
a) raises the upper lid
Swelling of the corneal tissue or any tissue is called
a) blepharitis
b) dystrophy
c) cataract
d. edema
d. edema
Inflammation of the mucous membrane that lines the inside of the eyelids and covers the anterior globe except for the cornea is called :
a) aniridia
b) blepharitis
c) conjunctivitis
d) dacryocystisis
c) conjunctivitis
The anterior ciliary arteries terminate at the
a) optic nerve
b) chorioid
c) limbus
d) iris
c) limbus
Aqueous humor is secreted by the
a) meibomian glands
b) cones and rods
c) cornea
d) ciliary body
d) ciliary body
All the colors we perceive are produced by the different photopigments found in the retinal cones.
a) 3
b) 36
c) 64)
d) 140
a) 3
