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1
Updated progressive lens design
By Eric Tam,
Registered Optometrist (Part 1)
BSc (Hons) in Optometry
2
Introduction
Optics related to eye anatomy
Innovation on lens design
Role play with your customers
3
Book Recommendation
You should know this book.
Ophthalmic Lenses AND Dispensing
Author: Mo Jalie Co
urt
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Hein
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an
n?
??
4
a. Eye length : 20.5mm 28 mm 23 mm
+8.00 D. -12.00 D. Plano
b. Center of Rotation
c. Retinal Curvature
Modelling the Eye on the Prescription
Axial Ametropia?
5
Eye Scan Analysis Hyperopia Myopia
6
Eye length
measurement according
to eye correction
MYOPE HYPEROPE
18,00
20,00
22,00
24,00
26,00
28,00
30,00
-10,00 -8,00 -6,00 -4,00 -2,00 0,00 2,00 4,00 6,00
Amétropia (dpt)
Ax
ial
len
gth
(m
m)
A. Eye length varies up to 30%
A
7
B. The Center of Rotation
. . .
B
Modeling from Prescription
8
c. The retinal curvature
Scan and MRI allow also to analyse the retina curvature according to the prescription.
Axial Length mm
Eq
uato
rial R
ad
ius
mm
C
9
The position of the centre of rotation influences fields of vision
A longer eye (myope)
sweeps a broader area
Myope Hyperope
10
The position of the centre of rotation influences fields of vision
Myope
Hyperope
11
A shorter eye (hyperope) needs a
softer surface
to compensate a higher density
of aberrations in the peripheral
area
The length and the curvature of the eye influence Swim Effect
12
The length and the curvature of the eye influence Swim Effect
13
Innovation on lens design
You should know this lens manufacturer.
14
EVOLIS : accounting prismatic effect
Lp 10.4 mm
Lp 12.2 mm
Lp 11.5 mm
Myopia
Emmetropia
Hyperopia
A dedicated design for each presbyope family
Takes into account the prismatic effects
EVOLIS Ametropia
15
Vertical Prismatic effect
EVOLIS
Hyperopes look
further down
Base UP Base Down
16
Horizontal Prismatic effect
EVOLIS
Hyperopes look
further inwards
Base IN Base OUT
17
Lp 10.4 mm
Lp 12.2 mm
Lp 11.5 mm
EVOLIS
Prismatic
Effects
RE
18
APTIVE®
iPAL Series
EVOLIS®
PER
SO
NA
LIS
AT
ION
RANGE
ENTRY-LEVEL MID-RANGE HIGH PREMIUM
UN
IVER
SA
L
SOPHISTICATION
World Class Progressives
SHORT FIT®
19
goes further on individualisation
thanks to BBGR Biometric TechnologyTM
The first lens that adapts
to the Eye’s Anatomy
20
ANATEO vs EVOLIS
21
Anateo’s Success Factors
Lp 10.4 mm
Lp 12.2 mm
Lp 11.5 mm
EVOLIS
ANATEO
Ametropia
Ametropia Eye Anatomy
EVOLIS
ANATEO
22
An individualised conception
Softer Surface
For short eyes (hyperopes)
Wider field of Sharp Vision
For long eyes (myopes)
23
Anateo : Proven performance with wearer test
Wider Fields of Vision
More Comfortable with reduced Swim Effect Faster adaptation due to quicker & more accessible discovery of Visual space
43%
27%
57%
23%
66%
22%
0%
20%
40%
60%
80%
100%
Traditional PALs
Evolis Anateo
Few hours
Immediate
24
Anateo : Proven performance in the market
5.5% 19.9% 77.9%
4.0% 22.4% 73.6%
3.8% 20.0% 76.2%
2.4% 21.9% 75.8%
0% 20% 40% 60% 80% 100%
Far Vision
Near vision
Mid-distance
Wearer moving
Worst Identical Better
25
… WITH FRAME FITTING CUSTOMIZATON
PDM
PDM PDM
26
PDM
Lp 10.4 mm
Lp 12.2 mm
Lp 11.5 mm
Ametropia
Ametropia Eye Anatomy
Ametropia Eye Anatomy Framization
EVOLIS
ANATEO
ANATEO PDM
ANATEO PDM
Frame
Wear
Parameters
27
FRAMES HAVE DIFFERENT FITTING CHARATERISTICS
VERTEX
FRAME TILT ANGLE
FRAME CURVE ANGLE
28
PDM: USE FOR NON-STANDARD DATA Pro
duct
perf
orm
ance
Non standard
wearer data
Non standard
wearer data
Standard wearer data
Standard progressive
lens
AnateoTM
Anateo
with PdM option
AnateoTM
with PdM option
Eye-Lens Distance = 11 to 13mm
Frame Tilt = 4 to 10 degrees
Frame Wrap = 0 to 8 degrees
29
WHEN TO USE ANATEO PDM
30
Tools/ Inclinometer adapted for PDM
EYE LENS DISTANCE FRAME TILT ANGLE
FRAME CURVE ANGLE
31
Tech Specifications
32
Future: ANATEO MIO
Lp 10.4 mm
Lp 12.2 mm
Lp 11.5 mm
Ametropia
Ametropia Eye Anatomy
Ametropia Eye Anatomy Framization
ANATEO MIO
Frame Wear
Parameters
EVOLIS
ANATEO
ANATEO PDM
Ametropia Eye Anatomy Framization ANATEO MIO Reading Dist
Reading
Distance
Ametropia Eye Anatomy Framization Reading Dist
33
A pioneering
measurement device
EyeTab® automatically
measures the distance
between the reading
surface and the lens, based
on the wearer’s natural
reading posture.
The EYETAB – For ANATEO MIO
ANATEO PDM + EYETAB = ANATEO MIO
Winner 2010
Measure
Reading Distance
34
Availability
PDM
MIO
NOW
AVAILABLE
Coming
Soon!
Europe’s Top Selling Progressive
2010 Winner of the Silmo d’Or
EVOLIS
35
Summary
Optics related eye anatomy
Innovation on lens design
Bibliography References:
Atchison DA , Jones CE, Schmid KL, et al. Eye shape in
emmetropia and myopia. Investigative Ophthalmology and
Visual Science. 2004; 45: 3380-3386.
Grosvenor T, Goss D, Clinical management of myopia, London: Butterworth Heineman, 1999.
Mo Jalie, Ophthalmic Lenses & Dispensing, Butterworth Heinemann,3rd Edition, 2008.
Gilmartin B ,Myopia: precedents for research in the twenty-first century
Clinical & Experimental Ophthalmology, 2004; 32: 305–324
Co
urt
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f B
utt
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ort
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Hein
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an
n?
??
36
THANK YOU
光學鏡片鍍膜技術
如何與時並進改善人類生活
Mr. Bryan NgMBA, M(Optom).
UNSW, Australia
Copyright© Essilor 2012
現代鍍膜基本技術
易潔表層
防反光鍍膜
防花加硬鍍膜
鍍膜結構
Copyright© Essilor 2012
Copyright© Essilor 2012
Copyright© Essilor 2012
防污易潔功能
令眼鏡易於清潔
Copyright© Essilor 2012
油性箱頭筆形成水珠狀墨點
抗污表層Super Oleophobic Coat
Easy clean & smudge resistant
Copyright© Essilor 2012
Scratch resistance
™™
Slide -Fx
- technologyTM
Smudge
Scratch Dust
Water
During the evaporation process, AR and topcoat molecules are energized by ions.
With -technologyTM
: The intense increase in energy causes all molecules, including the new conductive molecules responsible for the dust-repellence efficiency, to create a compact and more uniform matrix for optimal efficiency.
Without With
ons ntelligence+Step 2 : Molecule Densification
1
When a lens is covered with dust, it needs to be cleaned.
4
Consequently, the lens is never really free of dust or perfectly clean.
3
After wiping, the positive dust particles are attracted by the negative electrostatic charges.
2
Wiping generates negative electrostatic charges on the surface of the lens.
Without - technologyTM
regular anti-reflective lens actually attracts dust, and even
more when cleaned.
The results are clear
Before wiping After wiping
Thanks to -technologyTM, Crizal Forte UV lenses remain completely transparent by combining
• the best dust-repellent efficiency with
• a surface proven to be the most hydrophobic on the market
Measurement of Hydrophobic efficiency
The contact angle measures the angle of drop of water on the lens surface.
The higher the angle value,
The higher the water repellence performance.
Low contact angle
High Contactangle
The ProcessTM (High Surface Density ProcessTM) of New Crizal Forte UV allows to increase the density of hydrophobic and oleophobic perfluorosilane molecules on the lens surface. Therefore, the surface is perfectly covered.
Standard Top Coat
Crizal Forte UV Top Coat
Top Coat molecules are disconnected.
The lens surface is not totally covered.
Top Coat molecules are closely linked. The densification brings a perfect coverage of the surface of the lens .
ProcessTM
HSD ProcessTM
Thanks to the ProcessTM, Crizal Forte UV Top Coat
molecules perfectly cover the surface of the lens. It increases the contact angle. Thus smudges and water droplets are much more repelled from the surface of the lens and smudge-resistance is improved.
Contact angle of a drop of water on a standard Top Coat
Contact angle of a drop of water on Crizal Forte UV Top Coat
Without HSD With ProcessTM
106° 116°
Copyright© Essilor 2012
鏡片鍍膜標準測試
顯微鏡檢查鍍膜情況
鋼刷測試 (MC+HC)
Bayer Sand – 滾砂測試 (MC)
易潔測試 (ECC)
Glossary : Anti-reflective Efficiency
The % of Global performances in AR Efficiency taking into account Reflection and Chroma
« Rv » value mean Reflection : The lower the value, the more efficiency the AR coating5 classes : Higher the class, lower the Rv
•Class 1 : Rv% > 4•Class 2 : 2<Rv%<4•Class 3 : 2<R%<1•Class 4 : 1<Rv%<0.5•Class 5 : Rv%<0.5
« C » Chroma : intensity of residual colour : the lower the value, the less visible the AR coating
•Class 1 : C>30•Class 2 : C between 15 & 30•Class 3 : C between 7 & 15•Class 4 : C between 4 & 7•Class 5 : C < 4
ReflectionRv%
Chroma (class)
Hue (°)« h » Hue : Colour angle on the L a*b* colorimetric graphNo class, no evaluation, only informative value in degree
Glossary : Scratch Resistance Efficiency
The % of Global performances in Scratch Resistance Efficiency taking into account Sand Bayer test, ISTM Bayer test, and Steel Wool test
Bayer ISTM : Simulation of the thin superficial scratches tearing off the AR coatingBayer Sand : Simulation of scratches of medium depth tearing off the AR coating and part of hard coat5 classes : higher the class, better the Scratch Resistance
•Class 1 : Bad•Class 2 : Average•Class 3 : Good•Class 4 : Very good•Class 5 : Excellent
Simulation of deep scratches tearing off the AR coating, the hard coat, and potentially part of the substrat3 classes : Higher the class, better the Scratch Resistance
•Class 1 : Bad•Class 3 : Good•Class 5 : Very Good
Bayer tests
Steel Wooltest
Glossary : Cleaning Efficiency
The % of Global performances in Cleaning Efficiency taking into account Cleanability, Anti-static and Contact Angle
Simulation of the number of wipings needed to get rid of a calibrated sebum on the surface of the lens correlated to oleophobic efficiency5 classes : higher the class, less wiping are needed
•Class 1 : Bad•Class 2 : Average•Class 3 : Good•Class 4 : Very good•Class 5 : Excellent
Charge applied on the surface of the lens, evaluation of the time necessary for the charge to desappear from the lens
•Class 1 : Without Anti-static layer•Class 5 : With Anti-static layer
Measurement of the angle of a drop of water on the lens surface5 classes : Higher the class, more water repellent
•Class 1 : Angle < 30°•Class 2 : Angle between 30°& 105°•Class 3 : Angle between 105°& 110°•Class 4 : Angle between 110°& 115°•Class 5 : Angle > 115°
Evaluation of
oleophobicefficiency(Cleanabili
ty)
Evaluation of Anti-static
efficiency(JCI test)
Evaluation of
hydrophobic
efficiency
Measurement of the sliding angle of a drop of water on inclined planeNo class, only the value in degreeLower the value, better the Water Repellence
SlidingAngle
Glossary : UV Protection
E-SPF category taking into account backside reflection :The higher the E-SPF, the better the UV Protection
The global protection factor integrates : UV passing through the lens , and UV reflected by the back sideThe higher the E-SPF, the better the UV Protection
•Category 3* : E-SPF value 1 to 3 -> Ruv > 33%•Category 5* : E-SPF value 3 to 7 -> 33%>Ruv>14%•Category 10*: E-SPF value 7 to 15 -> 14%>Ruv>7%•Category 25*: E-SPF value 15 to 49 -> 7%>Ruv>2.5%
*E-SPF could be different in 1.5 refractive index
E-SPF (Category)
Copyright© Essilor 2012
The most advanced AR lens, Now with exclusive backside UV protector
最先進的AR鏡片採用獨創的後方紫外線防護技術。
BACKFRONT
LENS
SCRATCH-RESISTANCE
DUST REPELLENCE
DUST REPELLENCE
SCRATCH-RESISTANCE
AR EFFICIENCY
SMUDGE & WATER REPELLENCE
SMUDGE & WATER REPELLENCE
AR EFFICIENCY
BROAD SPECTRUM TECHNOLOGY NEW
Front
UV Transmission cut by Material
前方鏡片物料阻擋紫外線透過鏡片前面入侵眼睛
Back
UV Reflection stopped by Crizal Forte UV
後方Crizal Forte UV 同時阻擋來自鏡片後面和側面的紫外线反射
+
Result: Front & back UV minimized
結果: 前及後表面紫外線消除
E-SPF Definition
Introducing the
“Eye- Sun Protection Factor”
鏡片全效防紫外線指標 E-SPF
www.espf.com
現代城市人生活上會經常遇到…..
Blue light380nm ~ 500nm
Wavelength/ nm
Visible light (380~780nm)
1010
1024
1022
1020
1018
100
Wavelength(nm)
108
106
104
102
1016
1014
1012
X raysg rays UV IR MicrowaveFM
AM
Long radio waves
Radiowaves
10-16
10-14
10-12
10-10
10-2
10-8
10-6
10-4
100
102
104
106
108
750
700
650
600
550
500
450
400
現代城市人生活上會經常遇到…..
Digital Eyestrain is a Common Symptom
(U.S., Eye-strain and other visual problems associated with computer, all age group)
Source: National Institute of Occupational Safety and Health in America
Eye-Strain
90%
Potential cause of eye-strain
•Long hours on digital screens
•Blue lights from LED lights & computers
(Excess use of accommodation)
(glare and flicker)
Environment
Blue light
- High energy- Easy to scatter
Environment
- LED device- Organic EL device
0.0
1.0
2.0
3.0
4.0
5.0
380 430 480 530 580 630 680 730 780
wavelength/ nm
Sp
ectr
al
rad
ian
ce/
W/s
r-m
2-n
m
LED deviceOrganic EL device
- Blue light emission
Short wavelength
(Blue)Long wavelength
(Red)
High frequency of contactLow frequency of contact
Why Blue Light disperse easily
「Blue Light」 are easy to disperse, causing glare
4.4 times more
Concept of SEECOAT BLUE Development
「Blue Light」: Increases to eyes
「Blue Light」= Easy to disperse藍光容易散射
70
80
90
100
400 450 500 550 600 650 700
波長(nm)
分光透過率
(
%
)
- Standard AR Coating
- SEECOAT BLUE
- TINTING
Tra
nsm
issiv
ity d
istr
ibution(%
)
Wavelength (nm)
Tinting vs Coating
Blue Light Care
How to reducing Blue light?
Reflection
Reflects and cuts Blue light by 10%
Reflects and cuts powerful blue light (380 ~ 500nm) which has higher tendency to disperse among the visible light