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

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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®

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goes further on individualisation

thanks to BBGR Biometric TechnologyTM

The first lens that adapts

to the Eye’s Anatomy

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ANATEO vs EVOLIS

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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)

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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

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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

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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

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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…..

現代人的生活….

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