Presenting new technologies and advancement in spectacle lens materials CET approved C-36183 For Trivex Lens Specialist Practices, UK Harder, stronger, clearer. A live webinar presented by the ABDO College in Canterbury, UK in association with PPG Optical Materials
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Presenting new technologies and
advancement in spectacle lens materials
CET approved C-36183
For Trivex Lens Specialist Practices, UK
Harder, stronger, clearer.
A live webinar presented by the ABDO College in Canterbury, UK in association with PPG Optical Materials
Dora Plisic
Trade Manager
PPG Optical Materials
Kevin Gutsell
FBDO (Hons) SLD
ABDO
Keith Cross (guest speaker)
Director, Rx Technologies, R&D PPG
Optical Materials
• Introduction
• Timeline of lens material technology developments
• Overview of lens materials technologies
• Lens material properties and patient benefits
• Developments in lens design and coating technologies
• British consumer trends
• Summary and Q&A
Course Outline
How has technology overall
evolved over the last 60 years?
1937 1977 1983 1991 2001 2007
2G: 1st GSM network
3G: 1st country to launch - UK
Technology Evolution: The Telephone
Technology Evolution: The distribution model
2 years contract with mobile phone network providers
New contract is signed
New mobile phone platform
is provided
How has technology in the ophthalmic lenses evolved over the last 60 years?
Anatomy of an ophthalmic lens
Patient
comfort
Technology Developments in Lens Materials
1950’s CR-39® lens development
begins
1970’s FDA impact test regulation
increases use of CR-39®
lenses 1980’s
2000’s Trivex® lenses introduced
Prescription Distribution
85% of Rx’s in Western Countries are
in the range of +/-3.00 D
Polycarbonate lenses become
more popular in U.S.
Technology Developments in Lens Materials
1980’s
1990’s Additional developments in high
index lenses (1.60, 1.67)
Mid Index (1.56, 1.60) lens
development begings
Prescription Distribution
In the Pacific region, prescriptions are
higher from +/-3.00 to +/-6.00 D
2000’s Very high index lenses
development (1.74)
What is a lens material made from?
Lens material overview: CR-39®
Chemistry
•Organic (Carbon-based)
•Properties:
• Impact resistance better
than glass
• High resistance to heat
• High Abbe number
• Lighter than glass
Structure
•Thermoset
•Highly cross-linked
Lens material overview: Polycarbonate
Chemistry:
•Organic (Carbon-based)
•Properties:
• High Impact resistance
from 90° angle only
• Low resistance to heat
• Low Abbe value
Structure:
•Thermoplastic
•Long independent chains
•Not cross-linked
Lens material overview: High Index
Chemistry:
•Organic (Carbon-based)
• Urethane backbone with added sulfur to
increase refractive index
•1.60: approximately 30% sulphur
•1.67: approximately 40% sulphur
•1.74: approximately 60% sulphur
•Properties:
• Thinner lens
• Lower optical performance
• Higher density
Structure:
•Thermoset
•Highly cross-linked
Lens material overview: Trivex®
Chemistry:
•Organic (Carbon-based)
•Urethane backbone enriched
with Urea (Nitrogen)
•Properties:
• High Impact resistance
• High Resistance to heat
• High Optical performance
• Lightest prescription lens
material
Structure:
•“Quasi-Thermoset”
•Slightly cross-linked long
chain structure
How does this translate
to the overall performance
properties of the lens?
Patient
comfort
60
50
40
30
1.74
(33)
Trivex
(45)
CR-39
(58)
1.67
(31) Polycarbonate
(30)
1.60
(40)
Clearest
17
Clear Vision: Abbe Number
The Abbe Number (V-value) is a measure of the dispersion exhibited by the material. The higher
the Abbe Number the more accurately a lens aligns the spectrum of light waves that pass through
it.
Heaviest Lightest
Trivex 1.11 g/cm3
Polycarbonate
1.20 g/cm3
1.60
1.30 g/cm3 CR-39
1.31 g/cm3
1.67
1.36 g/cm3
1.74
1.47 g/cm3
1.10
1.20
1.30
1.40
1.50
Lightweight: Density
Density expresses the weight of the material. The lower the density, the lighter and more
comfortable the lens will be for the patient.
Thin: Refractive Index
1.65
1.60
1.55
1.50
1.70
1.75 High Index
1.74
CR-39
1.50
Polycarbonate
1.59
High Index
1.67
Mid Index
1.60
Trivex 1.53
Refractive index is the ratio of the velocity of light in vacuum to that in the material. It tells
us how fast light travels through a material.
Ultra violet (UV) radiation is known to cause skin cancer and protection of the eyes from UVA and UVB is considered essential for every patient.
Eye Health: UV Protection
400
390
380
350
High Index
1.74
CR-39
1.50
High Index
1.67
Polycarbonate
1.59
Mid Index
1.60
UV cut- off
(nm)
Trivex 1.53
21
Brittle Resilient
Polycarbonate
>700 in-lbf
1.60
53 in-lbf CR-39
31 in-lbf
1.67
56 in-lbf
300
200
100
0
>700 Trivex >700 in-lbf
Safety & Protection: Durability
How do these features
translate into patient benefits?
Lens is not one feature it is the combination of the features to insure patient comfort
Patient Comfort •80 percent of what children learn in their first 12 years comes through their eyes
• UV levels are three times greater in summer than winter • 20% of cataract cases are due to UV rays • The most of UV damages to eye happen prior to the age of 12 as the eye is not mature and fully protected against UV
• Rimless frames require durable lens that wont break or crack
• Seniors have aging and thinner skin on their nose
• 64.5% of adults are physically active
Potential benefits to ECPs
HIGH END
MID-RANGE
BASE / ENTRY
ADC / CR-39® Global
Trivex®
1.56 Mid-Index
Asia
Polycarbonate US
1.60 High-Index Europe 1.67 High-Index
Europe & US
1.74 High-Index
Europe & US tribrid™
Lens materials positioning
DIOPTRES 0.00 +/-3.0 +/-7.00
Knowledge is power
• Understanding the patient
– Understanding patients needs
– Understanding patients lifestyle
– Understanding patients expectations
• Repeating the benefits of recommended lens
• Educating patients about lenses
• Using regular mailings to keep in touch with the patient.
Lens materials - market share UK
HIGH END
MID-RANGE
ENTRY
0,58%
20,12%
3,6%
1,80%
73%
Source: Strategy with Vision, market data for Y2011
Lens design - market share UK
21,32%
11,27%
67,41%
40%
60%
Source: Strategy with Vision, market data for Y2011
HIGH END
MID-END
18,80%
20,30%
Lens coatings - market share UK
17,40%
43,40% ENTRY
Source: Strategy with Vision, market data for Y2011
Have our dispensing trends
evolved with the technology?
HIGH END
MID-END
18,80%
20,30%
To summarize - market share UK
23,72%
73%
ENTRY
40%
0,58%
60%
60,80%
11,27%
Source: Strategy with Vision, market data for Y2011
Consumer trends
• Britain has become a gadget-obsessed nation, watching more television
online, spending more on internet shopping and using smartphones and
tablets to access the web more heavily than any of the world's leading
economies, according to new research.
• The British love of the latest devices has even seen the UK overtake Japan in
mobile internet use, according to the report from media regulator Ofcom,
which compares data across 17 countries, including the US, China, India,
Russia, Brazil, Ireland, Sweden, France and Germany.
• Mark Sweney
• The Guardian, Thursday 13 December 2012
UK is becoming one of the worlds most web and gadget obsessed countries according to the
latest survey results from Ofcom's annual communications market report.