The individual awarded the first patent for a corneal lens made of PMMA was
Tuohy
Until the 1930s, all contact lenses were made of
Glass
Polycon I, the first silacrylate lens, was developed by:
Seidner
The biggest disadvantage of PMMA as a contact lens material is its lack of
Gas permeability
Bifocal contact lenses have been marketed in the US since which 20th century decade?
50's
From the 1930s through the 1960s, the material of choice for contact lenses were
PMMA
The first company to market soft lenses in the US was
Bausch and Lomb
One-day disposable soft lenses became available in
1994
The first company to make contact lenses of PMMA in the U.S. was
Obrig
The company responsible for bringing the soft lens material HEMA to the US was
National Patent Development Center (NPDC)
The contact lens pioneer who made improvements to lens design by inventing the topogometer to better measure corneal topography was
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:
Da Vinci
The Food and Drug Administration has been involved in approval of contact lens materials since the year
1968
Rigid gas permeable (RGP) contact lenses have been marketed in the U.S. since which decade of the twentieth century?
70's
The chemist who invented HEMA is:
Wichterle
How did George Butterfield change the way contacts were made?
created peripheral curves
In 1971 what company introduced soft contact lenses in the US?
Bausch & Lomb
Who first designed the benefits of fluorescein to evaluate a contact lens on the eye?
Obrig
Which scientist first understood that corneal power could be altered by submerging the eye in a glass bowl of water?
DaVinci
Who was the Swiss doctor who considered the benefit of pinhole to improve vision?
Fick
If a lens is fitting too loose what will tighten the fit?
increase the diameter
This individual is considered to be the first person to conceive the idea of a contact lens.
Leonardo DaVinci
In 1971, what company introduced soft contact lenses in the US?
B&L
What lens material allows the most amount of oxygen to transmit through the lens?
GasPerm
Benefits of polymethylmethacrylate (PMMA)
Easy to insert and remove
Easy to care for
Easy modifications
Strong, durable, with a long life span
Why is PMMA no longer manufactured and what are the effects on the cornea?
No oxygen permeability which dries out the cornea and lead to corneal hypoxia.
Which area of the lens contains the refractive power?
Optic zone
A _____ _____ refers to the increase or decrease in anterior edge thickness to change the lens mass or aid in lens positioning.
Lenticular flange
Which design is used to reposition a lens that rides low on the cornea?
Myoflange
The edge of a contact lens is divided into which 3 zones.
Edge apex
Posterior zone
Anterior zone
Which zone of the edge of a contact lens is responsible for allowing movement of the lens across the cornea?
Posterior zone
Which 2 things effect saggital depth?
Base curve and diameter
What are the 3 curves on the back side of a lens?
CPC, IPC, AND PPC.
Which of the following curves is the steepest?
IPC
CAC
CPC
PPC
CPC. The CPC contours the shape of the cornea but flattens towards the periphery of the lens.
Formal definition of contact lenses?
A medical device that is placed directly on the eye and is used for refractive, therapeutic, prosthetic, or cosmetic purposes.
Refractive purposes?
Myopic
Hyperopic
Astigmatism
Presbyopia
Therapeutic purposes?
Protection
Healing
Usually soft contact lenses
Prosthetic purposes?
Cover an unsightly eye
More natural appearance
Increase self-esteem
Cosmetic purposes?
Enhance or change eye color
Contact lens designs: Scleral
Covers the cornea and the conjunctiva overlying the sclera
Contact lens designs: Semi-scleral
Bridge the limbus and lie partially on the sclera
Contact lens designs: Corneal
Confined to the cornea
Contact lens modalities?
Spherical
Aspheric
Toric
Multifocals
-Progressive from center to edge
-Concentric
-Segmented
Gas permeable contact lens materials:
CAB, SA, FSA
Soft contact lens materials:
Hydroxyethylmethacrylate
Hydrogel
Silicone Hydrogel
Classifications by FDA
Daily wear:
Put in in the morning, take out at night
Extended wear:
Up to 6 consecutive nights
Continuous wear:
Up to 30 consecutive nights
Not recommended
What is fenestration and its purpose?
Holes in the lenses for tear exchange
Start with which meridian on K readings?
The flattest
The individual awarded the first patent for a corneal lens made of PMMA was
Tuohy
Until the 1930s, all contact lenses were made of
Glass
Polycon I, the first silacrylate lens, was developed by:
Seidner
The biggest disadvantage of PMMA as a contact lens material is its lack of
Gas permeability
Bifocal contact lenses have been marketed in the US since which 20th century decade?
50's
From the 1930s through the 1960s, the material of choice for contact lenses were
PMMA
The first company to market soft lenses in the US was
Bausch and Lomb
One-day disposable soft lenses became available in
1994
The first company to make contact lenses of PMMA in the U.S. was
Obrig
The company responsible for bringing the soft lens material HEMA to the US was
National Patent Development Center (NPDC)
The contact lens pioneer who made improvements to lens design by inventing the topogometer to better measure corneal topography was
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:
Da Vinci
The Food and Drug Administration has been involved in approval of contact lens materials since the year
1968
Rigid gas permeable (RGP) contact lenses have been marketed in the U.S. since which decade of the twentieth century?
70's
The chemist who invented HEMA is:
Wichterle
How did George Butterfield change the way contacts were made?
created peripheral curves
In 1971 what company introduced soft contact lenses in the US?
Bausch & Lomb
Who first designed the benefits of fluorescein to evaluate a contact lens on the eye?
Obrig
Which scientist first understood that corneal power could be altered by submerging the eye in a glass bowl of water?
DaVinci
Who was the Swiss doctor who considered the benefit of pinhole to improve vision?
Fick
If a lens is fitting too loose what will tighten the fit?
increase the diameter
This individual is considered to be the first person to conceive the idea of a contact lens.
Leonardo DaVinci
In 1971, what company introduced soft contact lenses in the US?
B&L
What lens material allows the most amount of oxygen to transmit through the lens?
GasPerm
Benefits of polymethylmethacrylate (PMMA)
Easy to insert and remove
Easy to care for
Easy modifications
Strong, durable, with a long life span
Why is PMMA no longer manufactured and what are the effects on the cornea?
No oxygen permeability which dries out the cornea and lead to corneal hypoxia.
Which area of the lens contains the refractive power?
Optic zone
A _____ _____ refers to the increase or decrease in anterior edge thickness to change the lens mass or aid in lens positioning.
Lenticular flange
Which design is used to reposition a lens that rides low on the cornea?
Myoflange
The edge of a contact lens is divided into which 3 zones.
Edge apex
Posterior zone
Anterior zone
Which zone of the edge of a contact lens is responsible for allowing movement of the lens across the cornea?
Posterior zone
Which 2 things effect saggital depth?
Base curve and diameter
What are the 3 curves on the back side of a lens?
CPC, IPC, AND PPC.
Which of the following curves is the steepest?
IPC
CAC
CPC
PPC
CPC. The CPC contours the shape of the cornea but flattens towards the periphery of the lens.
Formal definition of contact lenses?
A medical device that is placed directly on the eye and is used for refractive, therapeutic, prosthetic, or cosmetic purposes.
Refractive purposes?
Myopic
Hyperopic
Astigmatism
Presbyopia
Therapeutic purposes?
Protection
Healing
Usually soft contact lenses
Prosthetic purposes?
Cover an unsightly eye
More natural appearance
Increase self-esteem
Cosmetic purposes?
Enhance or change eye color
Contact lens designs: Scleral
Covers the cornea and the conjunctiva overlying the sclera
Contact lens designs: Semi-scleral
Bridge the limbus and lie partially on the sclera
Contact lens designs: Corneal
Confined to the cornea
Contact lens modalities?
Spherical
Aspheric
Toric
Multifocals
-Progressive from center to edge
-Concentric
-Segmented
Gas permeable contact lens materials:
CAB, SA, FSA
Soft contact lens materials:
Hydroxyethylmethacrylate
Hydrogel
Silicone Hydrogel
Classifications by FDA
Daily wear:
Put in in the morning, take out at night
Extended wear:
Up to 6 consecutive nights
Continuous wear:
Up to 30 consecutive nights
Not recommended
What is fenestration and its purpose?
Holes in the lenses for tear exchange
Start with which meridian on K readings?
The flattest