BACK SURFACE PROGRESSIVE
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Transcript of BACK SURFACE PROGRESSIVE
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BACK SURFACE PROGRESSIVE
TOKAI
BS SERIES
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TOKAI BS SERIES
1) Back surface progressive
2) Back surface aspheric
3) Personal Design System
a. Selectable progressive corridor
b. Selectable front base curve
c. Requestable inset amount(Flexible inset amount)
1) Back surface progressive
2) Back surface aspheric
3) Progressive corridor 13 / 15
Custom-made back surface progressive
BS-C UVBack surface progressive
BS-13 UV
BS-15 UV
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The design points of BS seriesThe design points of BS series
1. Improvement in basic ophthalmic performance1. Improvement in basic ophthalmic performance
2. Correspondence to individuals (Personal Design System) 2. Correspondence to individuals (Personal Design System)
TOKAI
BS SERIES
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BACK SURFACE PROGRESSIVE DESIGN
Designing an ideal surface , which combines dioptoric,
aspheric and progressive surface
Improvement in Improvement in Basic performanceBasic performance
Assuming a progressive and aspheric surface
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Front surface aspheric design
-3.50D
Fixed aspheric amount
-4.00D-4.50D
BACK SURFACE ASPHERIC DESIGNImprovement in Improvement in
Basic performanceBasic performance
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-3.50D
Ideal aspheric amount for each
dioptor
-4.00D-4.50D
TOKAI BS series
BACK SURFACE ASPHERIC DESIGNImprovement in Improvement in
Basic performanceBasic performance
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Certain aspheric amount at each axis
-4.50D
-3.50D
BACK SURFACE ASPHERIC DESIGNImprovement in Improvement in
Basic performanceBasic performance
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Lower
BS series
Conventional progressive
Higher
15 KINDS OF FRONT BASE CURVEImprovement in Improvement in
Basic performanceBasic performance
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BACK SURFACE PROGRESSIVE + ASPHERIC
About 30% About 35%
Thinner and Lighter
IMPROVEMENT IN BASIC IMPROVEMENT IN BASIC OPHTHALMIC PERFORMANCEOPHTHALMIC PERFORMANCE
Increasing the vision field
Reducing floating and distortions
(S-6.00 ADD2.00 Comparison in Tokai)
Ordinary
BS series
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PERSONAL DESIGN SYSTEM (P.D.S)
*Entrustment is allowed
Correspondence Correspondence to individualto individual
Corresponding to each wearer’s individual eyes
1.Progressive corridor Selectable from corridor lengths
of 11, 13, 15 or 17mm2. Front base
curve Selectable front base curve from lower or higher
3. Inset Requestable inset 0.0 to 5.0mm, 0.1mm steps
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Corridor Length
SelectableE
ntrustment
◎◎
使用目的・累進経験・年齢・度数情報
◎
静的ライフスタイル・スタイリッシュフレーム◎
Active life style, mitigated floating and distortion
Considering the shift of requirements
Age Experience
PERSONAL DESIGN SYSTEM (P.D.S)
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CORRIDOR LENGTH
11mm
◎
13mm
◎
15mm
◎
17mm
◎
Correspondence Correspondence to individualto individual
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*Selecting from 13mm or 15mm automatically
*Determining appropriate corridor length, considering far dioptor and addition
Considering the shift of requirements
Age of wearer
Experience of wearing progressive
CORRIDOR LENGTHCorrespondence Correspondence
to individualto individual
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Front base curve
SelectableE
ntrustment
Standard Higher
Lower
Ophthalmic performance
CosmeticFrame shape
PERSONAL DESIGN SYSTEM (P.D.S)
Optimized based curveAdjusting
front curve
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*Request a Higher or Lower
*Two steps higher or lower taking a balance of R & L base curves
FRONT BASE CURVECorrespondence Correspondence
to individualto individual
LowerStandard
Higher
Higher
Lower
Negative Positive
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The lens is thin.Same distance from lens to face
= Small deformation
The lens is thick.Same distance from eye to lens
= Small distortion
FRONT BASE CURVE
Standard base curve
Lower
Higher
Increasingcosmetic performance
Increasingophthalmic performance
Correspondence Correspondence to individualto individual
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Inset
1) Specific inset 0.0mm to 5.0mm in 0.1mm step, at Right and Left2) Far PD and selecting reading distance from 33, 36 or 40cm
Calculated the inset amount based on
Far dioptor, Addition and Front base curve(Far PD 62mm and Reading distance 36cm)
Inset amount is printed on envelop
Requestabl
eE
ntrustment
PERSONAL DESIGN SYSTEM (P.D.S)
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Far and Near EP
Corridor length
Flexible inset design
Far EP
Near EP
Inset
Correspondence Correspondence to individualto individual
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Prism effect = Change of PDNaked eye sight
Prism effected eye sight
Object
Reading distance
Far PD
Flexible inset designCorrespondence Correspondence
to individualto individual
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Influence of Far dioptorInfluence of Far dioptor
1. 5
2. 0
2. 5
3. 0
3. 5
- 15. 00
- 10. 00
- 5. 00 0. 00 5. 00 10. 00Dioptor
75mm70mm65mm60mm
2.5mm
Flexible inset designCorrespondence Correspondence
to individualto individual
Inset(mm
)
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Model of calculated ray tracingModel of calculated ray tracing
Vertex distance 12mm Tilt angle: 10 degrees
Progressive corridor
Horizontal glance line
Reading glance line
Flexible inset designCorrespondence Correspondence
to individualto individual
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1. 5
2. 0
2. 5
3. 0
8 9 10 11 12 13 14 15 16
Vertex distance (mm)
Influence of vertex distanceInfluence of vertex distance
Flexible inset designCorrespondence Correspondence
to individualto individual
Inset(mm
)
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Transition by tilt angleTransition by tilt angle
1. 5
2. 0
2. 5
3. 0
0 5 10 15 20
Tilt angle (degree)
Flexible inset design
Inset(mm
)
Correspondence Correspondence to individualto individual
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Difference of Inset amount by PD for Far
Object
Requesting a specific Inset amountRequesting a specific Inset amount
Long PD
Large Inset mount
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Difference of Inset amount by PD for Far
Object
Requesting a specific Inset amountRequesting a specific Inset amount
Short PD
Small Inset amount
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Difference of Inset amount by Reading distance
Object
Requesting a specific Inset amountRequesting a specific Inset amount
Reading distance
Inset amount
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Difference of Inset amount by Reading distance
Object
Short Reading distance
Requesting a specific Inset amountRequesting a specific Inset amount
Large Inset amount
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Requesting a specific Inset amountRequesting a specific Inset amount
1. 5
2. 0
2. 5
3. 0
33 34 35 36 37 38 39 40
Reading distance (cm)
PD 70mm
PD 62mm
PD 54mm
Difference of Far PD & Reading distance
Long PD
Short PD
Inset(mm
)
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Suitable front base curve
Selectable progressive corridor
Selectable front base curve
Requestable inset amount
Flexible inset amount
P.D.S
Optimum aspheric amount
Improvement in basic performance
OPTIMIZATIONOPTIMIZATION
FLEXIBILITYFLEXIBILITYTOKAI BS SERIES
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TOKAI PROGRESSIVE LINE-UP
BS-C UV
BS-15 UV & BS-13 UV 1.70-15
PROGRESSIVE UV
1.60/42-15 PROGRESSIVE UV
1.50-15 PROGRESSIVE
1.60/42-13 PROGRESSIVE UV
1.50-13 PROGRESSIVE
GR
AD
E
Far vision All-round Near vision
1.70-13 PROGRESSIVE UV
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