TThe he First Back surface ProgressiveFirst Back surface Progressive世界初！内面累進多焦点レンズ世界初！内面累進多焦点レンズ

SEIKO P-1SYSEIKO P-1SY

Back surface PALBack surface PAL

December 2006December 2006

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Line Up of SEIKO PAL Line Up of SEIKO PAL 累進多焦点累進多焦点

P-1 SY P-1 SY 1.74 1.74 : Back surface PAL : Back surface PAL 内面累進内面累進P-1 SY 1.67 : Back surface PAL P-1 SY 1.67 : Back surface PAL 内面累進内面累進P-1 SY 1.60 : Back surface PAL P-1 SY 1.60 : Back surface PAL 内面累進内面累進P-1 W 1.67 P-1 W 1.67 ：： Standard PAL Standard PAL 標準外面累標準外面累

進進P-1 W 1.56 : Standard PAL P-1 W 1.56 : Standard PAL 標準外面累進標準外面累進SSVP-1GSSVP-1G （（ 1.671.67 ））

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SEIKO P-1 SSEIKO P-1 SYY （（ Synergy)Synergy)

The first “Back surface progressive additional lens” in the worldharmonize the PAL(=progressive additional lens) surface and TC surface (now with aspheric design as well) Adopting all the technologies of SEIKO PAL design 世界初の内面累進多焦点レンズ

1) MDA method : Multi Divided Aspheric 2) VPC method: Vertical Prism Control3) All aspheric surface on back side

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Nowadays, back TC is global standard内面 TC が世界標準

From front TC to back TCFrom front TC to back TC

Front TC Back TC

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Back surface PAL as next global standard ！内面累進を世界標準へ

From front PAL to back (surface) PALFrom front PAL to back (surface) PAL

PAL surface ＋ TC

surface

PAL surfaceLow based

spherical surface

TC surface

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Curve compositions of PAL lensesCurve compositions of PAL lenses

Front side PAL Back surface PAL

5 curve 5 curve

7 curve

7 curve

5 curve

5 curve 5 curve

5 curve

3 curve

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Why a distortion occurs in PAL lenses?Why a distortion occurs in PAL lenses?

Ｓ .Ｍ .＝ＭＳ × ＭＰ

Ｓ .Ｍ .(Spectacle Magnification)

ＭＰ＝ Power factor

１

１－Ｌ・Ｐ＝

ＭＳ＝ Shape factor

＝１

１－ ・Ｄ１ｔ ｎ

PALPAL

1) 1) The view size in Lens changeThe view size in Lens change

Single vision vision Bi-Focal Tri- Focal

2) How to fix the view sizeL : Distance

Behind Lens

P : Lens Power

T : Thickness

N : index

D1 ： Front curve

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Mechanism of Front side PALMechanism of Front side PAL

（Ｓ .Ｍ .）＝（ＭＳ） × （ＭＰ）（Ｓ .Ｍ .）＝（ＭＳ） × （ＭＰ）

Front PAL 外面累進Front PAL 外面累進

Power arranged by front curve

Magnification change Variation of front curve Variation of power

Effect of

2 factors

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Mechanism of Back surface PALMechanism of Back surface PAL

Back surface PAL Back surface PAL 内面累内面累進進

Back surface PAL Back surface PAL 内面累内面累進進

（Ｓ .Ｍ .）＝（ＭＳ） × （ＭＰ）（Ｓ .Ｍ .）＝（ＭＳ） × （ＭＰ）

Control power onBack side

Magnification ChangeMagnification Change Variation of Front curveVariation of Front curve Variation of powerVariation of power

Only 1 effect

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Comparison between the PAL designsComparison between the PAL designs

Front side PAL Back surface PAL Back surface PAL + Back surface AS

Clear Vision 20% wider

Distortion 30% less

Clear Vision 30% Wider

Distortion 40% Less

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Squared project

View images of Back surface PAL 1View images of Back surface PAL 1

Base curve is different between vertical direction & horizontal direction.

Distortion becomes larger

Image distortion is

only occurred along

horizontal direction

and still smaller

Front side PAL

Back surface PAL

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View images of Back surface PALView images of Back surface PAL 2 2

Conventional front side PAL外面累進

Back surface PAL 内面累進

Far Area

Near Area

遠用視

近用視

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Wide view area of Back surface PALWide view area of Back surface PAL

Front side PAL design Front side PAL design

Back surface PAL

Back surface PAL design

WIDE WIDE

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Near view imagesNear view images of Back surface PALof Back surface PAL

Back surface PAL （ Blue ）

Front side PAL （ Green ）

150.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50

Sway and distortion has been

improved by as many as 2

ranks , if ADD is over 2.00D

Back surface PAL

Front side PAL

像変形率（

歪み・揺

れ）

　 2%

　 4%

　 6%

　 8%

　 10%

Improvement of Sway and distortion

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12mm 14mm 16mm 18mm

広

←

→

狭

Far sight/ 遠用実用視野

P-1G

Near sight/ 近用実用視野

P-1G

Middle sight/ 中間実用視野

P-1G

Sway & Distortion/ 揺像・歪像

小

←

→

大P-1G

P-1W14

SFDP-1W14

SFD

P-1W14SFD

P-1W14

SFD

12mm 14mm 16mm 18mm

12mm 14mm 16mm 18mm 12mm 14mm 16mm 18mm

広

←

→

狭

広

←

→

狭

Corridor length 累進帯長

P-1SY14

P-1SY12

P-1SY14

P-1SY14

P-1SY12

P-1SY14

P-1SY12 P-1W16

P-1W16

P-1W16

P-1W16

P-1SY12

Comparison of each corridor PAL

Corridor length 累進帯長 Corridor length 累進帯長

Corridor length 累進帯長

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Target user of P-1 SYTarget user of P-1 SY

1) High additional power user （ Over +2.00 ） 高加入2) Hyperopia ( Far sightedness) 遠視3) Person who cares Sway and Distortion 4) Person who needs Wider vision 5) Person who is NOT satified with other conventional PAL lens （ Front side PAL)6) Person who wants to have Newest and high advanced

products （ such like Back surface PAL ）

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Myopia 近視 Hyperopia 遠視

Hyperopia : example Hyperopia : example 遠視遠視

（ Minus lens ） （ Plus lens ）

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Corridor length types of SEIKO PALCorridor length types of SEIKO PAL

累進帯長一覧

1 ） P-1 SY (1.74,1.67,1.60 Back

surface PAL)

10mm, 12mm, 14mm

2) P-1 W (1.67, 1.56 standard PAL)

14mm, 16mm

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Advantage of short corridor lengthAdvantage of short corridor length

短累進帯長の優位性！

Conventional Short corridor PAL

= BigBig Distortion, Distortion, BigBig Image swayImage sway

外面短累進外面短累進 == 像の歪み・揺れ 大像の歪み・揺れ 大

P-1 SY short corridor

= Small Small Distortion, Distortion, Less Less Image Image swaysway

内面短累進＝像の歪み・揺れ 小内面短累進＝像の歪み・揺れ 小

１２ｍｍ１２ｍｍ

１４ｍｍ１４ｍｍ

CorridorCorridor Recommended sizeRecommended size Minimum sizeMinimum size

Suggested frame vertical sizesSuggested frame vertical sizes

１０ｍｍ１０ｍｍ

Near area from FP ： over １７ mmNear area from FP ： over １７ mm

Far area from FP ： over １５ mmFar area from FP ： over １５ mm

Over ３２ mmOver ３２ mm

Near area from FP ： over １５ mmNear area from FP ： over １５ mm

Far area from FP ： over １０ mmFar area from FP ： over １０ mm

Over ２５ mmOver ２５ mm

Near area from FP ： over １９ mmNear area from FP ： over １９ mm

Far area from FP ： over １５ mmFar area from FP ： over １５ mm

Over ３４ mmOver ３４ mm

Near area from FP ： over ２１ mmNear area from FP ： over ２１ mm

Far area from FP ： over １５ mmFar area from FP ： over １５ mm

Over ３６ mmOver ３６ mm

Near area from FP ： over １７ mmNear area from FP ： over １７ mm

Far area from FP ： over １０ mmFar area from FP ： over １０ mm

Over ２７ mmOver ２７ mm

Near area from FP ： over １９ mmNear area from FP ： over １９ mm

Far area from FP ： over １０ mmFar area from FP ： over １０ mm

Over ２９ mmOver ２９ mm

22N = 2,148 人

Fair 7%

Not so comfortable 1%

Good 42%

Excellent 50%

High reputation of Back surface PALHigh reputation of Back surface PAL

Most of customers are satisfied with back surface PAL

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2002年 2003年 2004年 2005年

2002年 2003年 2004年 2005年

Sales increase of Back surface PALSales increase of Back surface PAL

Dramatically increasingDramatically increasing

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Specification Specification 基本性能基本性能

Product name : SEIKO P-1SY(Synergy) Material : Index : 1.74 Abbe No: 33 Density:1.47 Index : 1.67 Abbe No: 32 Density:1.36 Index : 1.60 Abbe No: 42 Density:1.22 Coating: Hard Multi coat (99.0%) Design: Back surface PAL & Aspheric design Length of progressive corridor : 10 / 12 / 14mm

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Production range Production range 製作範囲製作範囲

S 0.00 to S-10.00, TC-5.00 (Expanded from this Spring) S+6.00, TC+5.00 (Expanded from this Spring)

Addition : +0.50 to +3.50 Prism : Up to 3.00D Standard diameter : 80mm/75mm Available diameter : 1.74 60mm to 79mm /1mm step

1.67&1.60 55mm to 79mm /1mm step (+, Plano, MIX)

Also small diameter for minus lens available

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We are supplying the products based on this slogan. We wish to We are supplying the products based on this slogan. We wish to offer people around the world a gentle and comfortable visual life offer people around the world a gentle and comfortable visual life

through eyewear by making use of our advance technologies.through eyewear by making use of our advance technologies.