Study sets matching "contact lenses"

Study sets
Classes
Users

Study sets matching "contact lenses"

14 terms
Contact lenses
What does the contact lens rest on?
What is an ophthalmonmeter/keratometer?
What is astigmatism with the rule?
What is astigmatism against the rule?
Tear film
an instrument designed to measure the corneal curvature by us…
the vertical corneal meridian has the steepest curvature
the horizontal corneal meridian has the steepest curvature
What does the contact lens rest on?
Tear film
What is an ophthalmonmeter/keratometer?
an instrument designed to measure the corneal curvature by us…
Contact Lenses
Contact Lenses
Soft Contact Lenses
Rigid Contact Lenses
Gas-Permeable Contact Lenses
Corrective or cosmetic lens that usually placed on the cornea…
Made from polymers or materials that absorb water. Needs to s…
"Hard Lenses". Oxygen permeable. "RGP lenses". Last longer th…
Tend to be less expensive because the life of the lens. They…
Contact Lenses
Corrective or cosmetic lens that usually placed on the cornea…
Soft Contact Lenses
Made from polymers or materials that absorb water. Needs to s…
111 terms
Contact Lenses
Most practitioners would prefer to fit…
In spite of current popularity of gas…
A pmma lense would be contraindicated…
The characteristics of a pmma material…
B: Gas permeable lenses are easier to handle
A: High astigmatism
A: Ectatic corneal dystrophy
B: Oxygen permeable
Most practitioners would prefer to fit…
B: Gas permeable lenses are easier to handle
In spite of current popularity of gas…
A: High astigmatism
contact lenses
myopia
hyperopia
rigid/hard lenses= polymethylmethacryl…
rigid gas perm lenses
nearsightedness
farsightedness
impermeable to O2.... blur due to hypoxic edema
made of silicone and fluorosilicone... increased O2 perm... bad= at…
myopia
nearsightedness
hyperopia
farsightedness
15 terms
Contact Lenses
What are the types of contact lenses?
Hard/Rigid
Soft
Wear
1. Hard/rigid ... 2. Soft... 3. Daily/ Continuous -- Wear ... 4. Repla…
(13%) ... Mostly RGP ... Rigid Gas Permeable... Relatively inflexible…
(87%)... - Moderate to highly flexible; absorb a high percentage…
Either daily or continuous (worn sleeping) 24 hours a day
What are the types of contact lenses?
1. Hard/rigid ... 2. Soft... 3. Daily/ Continuous -- Wear ... 4. Repla…
Hard/Rigid
(13%) ... Mostly RGP ... Rigid Gas Permeable... Relatively inflexible…
Fitting Rigid Contact Lenses
RGP are fit essentially
To order RGP lenses you need to specity
Practitioner flexibility when prescrib…
Ideally fitting RPG
the same when judging fit of lens
-back optic zone radius (BOZR)... -Total Diameter (TD)... -Back ver…
custom-made multi-curve lens designs
-acceptable comfort... -adequate centration... -correct diameter... -s…
RGP are fit essentially
the same when judging fit of lens
To order RGP lenses you need to specity
-back optic zone radius (BOZR)... -Total Diameter (TD)... -Back ver…
Contact Lenses
Air Optix Night and Day Aqua
Air Optix Aqua
Purevision2HD
Pure vision
Monthly Silicone
Monthly Silicone
Monthly Silicone
Monthly Silicone
Air Optix Night and Day Aqua
Monthly Silicone
Air Optix Aqua
Monthly Silicone
Tinted Contact Lenses
What are some reasons for tinted conta…
What are the types of transparent tints?
What are the types of opaque tints?
Light tints transmittance what percent…
lens/material identification... enhancement or change in eye col…
with or without clear pupil
full coverage... partial coverage (open pupil)
90-96%
What are some reasons for tinted conta…
lens/material identification... enhancement or change in eye col…
What are the types of transparent tints?
with or without clear pupil
35 terms
Contact Lenses
care product
coloured contact lenses
contact lens solution
contact lens case
Pflegeprodukt
farbige Kontaktlinsen
Kontaktlinsenflüssigkeit
Kontaktlinsenbehälter
care product
Pflegeprodukt
coloured contact lenses
farbige Kontaktlinsen
Contact Lenses
Poly(methyl methacrylate)
Poly(2-hydroxyethyl methacrylate)
Monomers to make Contact Lenses
Initiator
Used from 1948-1980s... -Hard contact lens... -Great optical proper…
1961 ... Soft Lenses... Offers little oxygen to eye
-Poly(methyl methacrylate)... -Poly(2-hydroxyethyl methacrylate)…
Active center is created and reacts with monomer molecule... -ca…
Poly(methyl methacrylate)
Used from 1948-1980s... -Hard contact lens... -Great optical proper…
Poly(2-hydroxyethyl methacrylate)
1961 ... Soft Lenses... Offers little oxygen to eye
14 terms
Contact lenses
CAB
DSCL
DW
EW
Cellulose acetate butyrate
Disposable soft contact lens
Daily wear
Extended wear
CAB
Cellulose acetate butyrate
DSCL
Disposable soft contact lens
25 terms
Contact lenses
RGP is good for patients who have
RGP is good for patients who have
RGP is good for patients who have
RGP is good for patients who have
Astismatism
Borderline dry eyes
Refits
Irregular cornea
RGP is good for patients who have
Astismatism
RGP is good for patients who have
Borderline dry eyes
Contact Lenses
Base Curve Radius
Lens Power
Vertex Distance
Overall Diameter
The primary curve on the posterior or backside of the lens. E…
The prescription strength of a contact lens.
The distance from where the back of the spectacle lens rests…
The size of the lens when measured from edge to edge at the w…
Base Curve Radius
The primary curve on the posterior or backside of the lens. E…
Lens Power
The prescription strength of a contact lens.
29 terms
CONTACT LENSES
Conventional lense
Flexible wear lense
Extended wear lenses
Disposable lenses
Worn daily. Cleaned nightly. Replaced after 6 months.
Removed alternate nights and cleaned
Worn for a week at a time and cleaned
Worn for a set amount of time and disposed of. Cleaning!!
Conventional lense
Worn daily. Cleaned nightly. Replaced after 6 months.
Flexible wear lense
Removed alternate nights and cleaned
5 terms
Contact Lenses
Hard contact lenses
2 main categories of contact lens clea…
Soaking and storage solutions (disinfe…
Contact lens Wetting Solution componen…
termed hard because they are made of rigid plastic resin call…
1) Surfactants... 2) Enzymatic
0.01% Benzalkonium Cl ... + ... 0.01% Edetate Sodium
1. Surfactants, viscosity increasing agent such as hydroxyeth…
Hard contact lenses
termed hard because they are made of rigid plastic resin call…
2 main categories of contact lens clea…
1) Surfactants... 2) Enzymatic
Contact Lenses
What does the LO column in the CL pric…
What does the OC column in the CL pric…
What is the profit margin that we shou…
What are the 2 types of Global Plans
Lowest price that it can be sold
Our cost
$5 per box
Fitting only plans and Plans that include supply
What does the LO column in the CL pric…
Lowest price that it can be sold
What does the OC column in the CL pric…
Our cost
21 terms
Contact Lenses
What is not part of the case history?
A normal visible iris diameter measure…
A normal blink rate is
Tear break-up time will usually ______…
Fissure size
10.5 to 12.5 mm
10 to 15 blinks per minute
decrease
What is not part of the case history?
Fissure size
A normal visible iris diameter measure…
10.5 to 12.5 mm
29 terms
contact lenses
To determine the base curve for a pts…
soft contact lens diameter can be sele…
what is vertex distance? Is it needed…
With rigid gas permeable (RGP) contact…
keratometry
b) a soft lens should extend beyond the limbus. Visible iris…
Vertex is the distance from cornea to back of lens. Yes it's…
True. RGP's are more dependent on eyelid structure than soft…
To determine the base curve for a pts…
keratometry
soft contact lens diameter can be sele…
b) a soft lens should extend beyond the limbus. Visible iris…
19 terms
Contact Lenses
How long should the tear film remain u…
What is a normal reading for the Schir…
Lenses that contain 70% more water are…
Surfactant cleaners for soft and rigid…
10-15 seconds
15-20 mm in 5 minutes
High-water-content lenses
Oil, makeup, and lipids
How long should the tear film remain u…
10-15 seconds
What is a normal reading for the Schir…
15-20 mm in 5 minutes
Contact lenses
Hydrophobic
Hydrophilic
Peer Reviewed
Non peer reviewed
Does not like water
Loves water
Any article submitted for publication, read over by experts i…
No one is there to proof read the article
Hydrophobic
Does not like water
Hydrophilic
Loves water
40 terms
Contact Lenses
care product
coloured contact lenses
contact lens solution
contact lens case
Pflegeprodukt
farbige Kontaklinsen
Kontaktlinsenflüssigkeit
Kontaktlinsenbehälter
care product
Pflegeprodukt
coloured contact lenses
farbige Kontaklinsen
35 terms
Contact Lenses
aufbewahren
aus kosmetischen gründen
bleibt zentriert
blinzeln
store
for cosmetic reason
remain centre
blink
aufbewahren
store
aus kosmetischen gründen
for cosmetic reason
12 terms
Contact Lenses
J&J Moist
J&J Trueye
B&L BioTrue
CVH Avaira
One Day, 8.5/9.0 (30p/90p)
One Day, 8.5/9.0 (30p/90p)
One Day, 8.5 (90p only)
2 Week, 8.5 (6p)
J&J Moist
One Day, 8.5/9.0 (30p/90p)
J&J Trueye
One Day, 8.5/9.0 (30p/90p)
29 terms
contact lenses
types of soft lenses
what are the two chemical agents to re…
what is an agent that is not a chemica…
how long to you soak in a chemical to…
daily wear, reusable.... daily wear, disposable... extended wear re…
clorhexidine... thimerosal
hydrogen peroxide
4 hours
types of soft lenses
daily wear, reusable.... daily wear, disposable... extended wear re…
what are the two chemical agents to re…
clorhexidine... thimerosal
47 terms
Contact lenses
What types of astigmatism is there?
What is against the rule astigmatism?
What is with the rule astigmatism?
What lens would you use to correct len…
corneal... lenticular (residual)... with the rule ... against the rule…
where a negative cyl is placed at 90 deg to correct astigmatism
where a negative cyl is placed at 180 deg to correct astigmat…
soft contact lens or front surface toric rgp
What types of astigmatism is there?
corneal... lenticular (residual)... with the rule ... against the rule…
What is against the rule astigmatism?
where a negative cyl is placed at 90 deg to correct astigmatism
22 terms
CPO 3 - Contact Lenses
Contact Lens
Contact Lens Advantages
Soft Contact Lenses
Rigid Contact Lenses
A corrective, cosmetic, or therapeutic lens, usually placed o…
Less affected by wet weather, do not steam up, provide a wide…
Made from polymers or materials that absorb water, must stay…
Previously referred to as "hard" lenses, now known as rigid g…
Contact Lens
A corrective, cosmetic, or therapeutic lens, usually placed o…
Contact Lens Advantages
Less affected by wet weather, do not steam up, provide a wide…
81 terms
Contact Lenses Test 1
what are some of the drawbacks of kera…
Why is placido's disk the most common…
what is the advantage of the scheimpfl…
which computerized corneal topography…
1) Assuming a spherical cornea... 2) Only measures 3-4 mm of cor…
B/c we understand it's faults the best
measures ENTIRE cornea (thickness and curvature)
Scheimpflug (pentacam)
what are some of the drawbacks of kera…
1) Assuming a spherical cornea... 2) Only measures 3-4 mm of cor…
Why is placido's disk the most common…
B/c we understand it's faults the best
63 terms
Contact lenses
care product
coloured contact lenses
contact lens solution
contact lens case
Pflegeprodukt
farbige Kontaklinsen
Kontaktlinsenflüssogkeit
Kontaktlinsenbehälter
care product
Pflegeprodukt
coloured contact lenses
farbige Kontaklinsen
The History of Contact Lenses
describing/sketching the first ideas f…
the idea of making a mold of a wearer'…
made the first scleral, nonoptical con…
fitted the first optically correcting…
Leonardo da Vinci... 1508
Sir John Herschel... 1827
F.A. Muller... 1887
A.E. Fick... Edouard Kalt... 1888
describing/sketching the first ideas f…
Leonardo da Vinci... 1508
the idea of making a mold of a wearer'…
Sir John Herschel... 1827
35 terms
Contact lenses
care product
coloured contact lenses
contact lens solution
contact lens case
Pflegeprodukt
farbige Kontaktlinsen
Kontaktlinsenflüssigkeit
Kontaktlinsenbehälter
care product
Pflegeprodukt
coloured contact lenses
farbige Kontaktlinsen
Contact Lenses
care product
coloured contact lenses
contact lens solution
contact lens case
Pflegeprodukt
farbige Kontaktlinsen
Kontaktlinsenflüssigkeit
Kontaktlinsenbehälter
care product
Pflegeprodukt
coloured contact lenses
farbige Kontaktlinsen
38 terms
CONTACT LENSES
care product
coloured contact lenses
contact lens solution
contact lens case
Pflegeprodukt
farbige Kontaktlinsen
Kontaktlinsenflüssigkeit
Kontaktlinsenbehälter
care product
Pflegeprodukt
coloured contact lenses
farbige Kontaktlinsen
15 terms
Multifocal Contact Lenses
Non-Ideal Patients for Multifocal CL
Ideal Patients for Multifocal CL
Dominant Eye Determination
Patient Expectations
Multifocal CL are not good for pts w/:... high visual demands... un…
Low myopes with low adds and little-to-none astigmatism
Have pt look at chart... Place +1.50 over OD, then OS. ... Which ey…
"70% of time you will be successful at distance and near"... "H…
Non-Ideal Patients for Multifocal CL
Multifocal CL are not good for pts w/:... high visual demands... un…
Ideal Patients for Multifocal CL
Low myopes with low adds and little-to-none astigmatism
30 terms
Types of contact lenses
PMMA
PMMA
PMMA
Corneal warpage, corneal curvature and…
type of plexiglass
Back surface curve reflects cursive of cornea while front sur…
Does not allow transmission of oxygen and can induce corneal…
Long term wearing of PMMA lenses may include
PMMA
type of plexiglass
PMMA
Back surface curve reflects cursive of cornea while front sur…
21 terms
Contact Lenses Abbrev.
HCL
SCL
GPS
DW
hard contact lens
soft contact lens
gas permeable hard lens
daily wear
HCL
hard contact lens
SCL
soft contact lens
49 terms
Optics and Contact Lenses
Base curve
Optical Zone
The smaller the lens diameter....
The larger the lens diameter...
Contains optical zone & power of lens,radius of curvature of…
The diameter over which the base curve extends over the surfa…
The steeper the radius.
The flatter the radius.
Base curve
Contains optical zone & power of lens,radius of curvature of…
Optical Zone
The diameter over which the base curve extends over the surfa…
15 terms
Contact Lenses ch1
Kevin Tuohy
Glass
Polycon I, the first silacrylate lens…
The biggest disadvantage of PMMA as a…
The individual awarded the first patent for a corneal lens ma…
Until the 1930s, all contact lenses were made of:
Leonard Sneidner
Gas permeability
Kevin Tuohy
The individual awarded the first patent for a corneal lens ma…
Glass
Until the 1930s, all contact lenses were made of:
6 terms
COA- Contact Lenses
The diffusion of oxygen through a cont…
True or false: The application and eva…
Name the instrument used to determine…
Name three reasons to dispense a thera…
DK value
True
Radiuscope and or Contacto Gauge
To protect cornea from eyelids and eyelashes, to promote corn…
The diffusion of oxygen through a cont…
DK value
True or false: The application and eva…
True
51 terms
session 15: contact lenses
contraindications
primary indication
myopia
hyperopia
-risk of infection and inflammation if monocular lenses left…
correction of refractive errors
nearsightedness
farsightedness
contraindications
-risk of infection and inflammation if monocular lenses left…
primary indication
correction of refractive errors
122 terms
Toric Gas Permeable Contact Lenses
What form of toric design is used in S…
Astigmatism
When does astigmatism occur?
Residual Astigmatism
front surface toric
A defect in the eye or in the lens caused by a deviation from…
Occurs when the cornea or lens of the eye is not spherical an…
the amount of astigmatism found on over-refraction when a con…
What form of toric design is used in S…
front surface toric
Astigmatism
A defect in the eye or in the lens caused by a deviation from…
13 terms
Contact Lenses and Keratometry
Does a contact lens sit on the cornea…
Is the refractive power of contact len…
What type of contact lens has good oxy…
0.05 mm + ____ diopters
Tear film
Front surface
RGP's
0.25
Does a contact lens sit on the cornea…
Tear film
Is the refractive power of contact len…
Front surface
27 terms
Pediatrics 3 - Contact Lenses
What percent of CL wearers are children?
Until what age are children often fit…
What are the visual and optical advant…
What are the cosmetic advantages of CL…
10%
10-12 years old, but starting to become younger to even 8 yea…
Better peripheral vision... Reduced magnification or minificatio…
Appearance is more normal... Reduces social stigma in older chil…
What percent of CL wearers are children?
10%
Until what age are children often fit…
10-12 years old, but starting to become younger to even 8 yea…
40 terms
260A - Contact Lenses - SCL Fitting
What are the three reasons why a good…
If they meet the three goals, but the…
Why would someone want soft lenses ove…
What are the general steps for fitting…
1. Optimal vision... 2. Optimized comfort... 3. Minimize complicati…
Leave it!
Comfort... Quick adaption... Tints... Sports... Part-time wear possible... N…
1. Determine patient usage... 2. Determine type of lens... 3. Deter…
What are the three reasons why a good…
1. Optimal vision... 2. Optimized comfort... 3. Minimize complicati…
If they meet the three goals, but the…
Leave it!
32 terms
Contact Lenses I: Quiz #1
How do we distinguish WTR vs ATR Astig…
FDA Classes for Contact Lenses:... What…
What are the 3 FDA Groups for Contact…
What stem name indicated hydrogel lens…
WTR: vertical meridian has the steepest curvature (higher num…
Regular soft and GP contact lenses are Class II devices... -Mode…
1. Hydrogel Lenses... 2. Silicone Hydrogel Lenses... 3. Non-Hydroge…
Stem "filcon" indicates hydrogel lenses
How do we distinguish WTR vs ATR Astig…
WTR: vertical meridian has the steepest curvature (higher num…
FDA Classes for Contact Lenses:... What…
Regular soft and GP contact lenses are Class II devices... -Mode…
29 terms
Specialty Contact Lenses
Methafilcon
Hioxifilcon
SiHy Materials
Hydrogel materials
Dk 19.5, group 4 (high water, ionic)
Dk 15-23, HEMA/GMA, group 2 (high water/nonionic)
Definitive, lagado
Methafilcon, Hioxifilcon
Methafilcon
Dk 19.5, group 4 (high water, ionic)
Hioxifilcon
Dk 15-23, HEMA/GMA, group 2 (high water/nonionic)
20 terms
Spherical Soft Contact Lenses
Dailies aqua comfort plus
Dailies toal 1
Air optix night and day aqua
Air optix aqua
Nelfilcon a... hydrogel
Delefilcon... gradient
Lotrafilcon a... Plano option... CW, monthly... 13.8 mm
Lotrafilcon a... EW
Dailies aqua comfort plus
Nelfilcon a... hydrogel
Dailies toal 1
Delefilcon... gradient
50 terms
Lecture 1: Intro to Contact Lenses
What is a contact lens?... What does it…
What does a contact lens serve as to c…
What are Cosmetic Contact Lenses used…
For what 6 reasons do we choose contac…
A small, shell-like, hemispherical plastic lens... Rests on the…
Serves as the eye's new anterior surface to correct its refra…
Cosmetic contact lenses are used to correct the same conditio…
1. Cosmesis... 2. Improved vision... 3. Inconvenience of glasses... 4.…
What is a contact lens?... What does it…
A small, shell-like, hemispherical plastic lens... Rests on the…
What does a contact lens serve as to c…
Serves as the eye's new anterior surface to correct its refra…
18 terms
BLOCK 102 - Contact Lenses
Contact Lens Use
Soft Contact Lens Characteristics
Soft Contact Lens Advantages
Soft Contact Lens Disadvantages
-Refractive errors (Myopia, hyperopia, astigmatism, presbyopi…
-HEMA (hydroxyethylmethacrylate)... -Silicon hydrogel... -Larger th…
-Easy to adapt to; greater INITIAL comfort... -Will not pop-out…
-Lower original cost but a higher ongoing cost... -Vision fluxua…
Contact Lens Use
-Refractive errors (Myopia, hyperopia, astigmatism, presbyopi…
Soft Contact Lens Characteristics
-HEMA (hydroxyethylmethacrylate)... -Silicon hydrogel... -Larger th…
22 terms
260A - Contact Lenses - Orthokeratology
Are OrthoK lenses flatter or steeper t…
What is the difference between the 3 c…
How much do we want the corneal apex t…
What is reverse geometry design?
Flatter
The 4 curve has a flatter vase curve, and they have a flatter…
Not at all. We want a little bit of clearance. ... We want to h…
...
Are OrthoK lenses flatter or steeper t…
Flatter
What is the difference between the 3 c…
The 4 curve has a flatter vase curve, and they have a flatter…
10 terms
Soft Contact lenses for Presbyopia
With this lens type, near vision may b…
A simple approach where one eye is fit…
A bifocal lens design which functions…
When accommodation starts to be less e…
center near aspheric simultaneous vision lens design
monovision
simultaneous vision lens design
presbyopia
With this lens type, near vision may b…
center near aspheric simultaneous vision lens design
A simple approach where one eye is fit…
monovision
1 of 10