JP4648384B2 - 円環体インプラントの要求されるパワーの計算方法 - Google Patents
円環体インプラントの要求されるパワーの計算方法 Download PDFInfo
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- JP4648384B2 JP4648384B2 JP2007507338A JP2007507338A JP4648384B2 JP 4648384 B2 JP4648384 B2 JP 4648384B2 JP 2007507338 A JP2007507338 A JP 2007507338A JP 2007507338 A JP2007507338 A JP 2007507338A JP 4648384 B2 JP4648384 B2 JP 4648384B2
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- 239000007943 implant Substances 0.000 title claims abstract description 97
- 238000004364 calculation method Methods 0.000 title description 6
- 238000000034 method Methods 0.000 claims abstract description 26
- 210000004087 cornea Anatomy 0.000 claims description 44
- 230000003287 optical effect Effects 0.000 claims description 9
- 201000009310 astigmatism Diseases 0.000 abstract description 24
- 239000013598 vector Substances 0.000 abstract description 14
- 230000002980 postoperative effect Effects 0.000 abstract description 11
- 238000001356 surgical procedure Methods 0.000 abstract description 8
- 238000004458 analytical method Methods 0.000 abstract description 7
- 210000001508 eye Anatomy 0.000 description 25
- 208000014733 refractive error Diseases 0.000 description 9
- 210000005252 bulbus oculi Anatomy 0.000 description 8
- 238000012937 correction Methods 0.000 description 5
- 210000001525 retina Anatomy 0.000 description 4
- 230000001568 sexual effect Effects 0.000 description 3
- 102000000429 Factor XII Human genes 0.000 description 2
- 108010080865 Factor XII Proteins 0.000 description 2
- 210000001742 aqueous humor Anatomy 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 208000002177 Cataract Diseases 0.000 description 1
- 206010036346 Posterior capsule opacification Diseases 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 210000002159 anterior chamber Anatomy 0.000 description 1
- 230000004442 axial hyperopia Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000004329 axial myopia Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000004438 eyesight Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002207 retinal effect Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/16—Intraocular lenses
- A61F2/1613—Intraocular lenses having special lens configurations, e.g. multipart lenses; having particular optical properties, e.g. pseudo-accommodative lenses, lenses having aberration corrections, diffractive lenses, lenses for variably absorbing electromagnetic radiation, lenses having variable focus
- A61F2/1637—Correcting aberrations caused by inhomogeneities; correcting intrinsic aberrations, e.g. of the cornea, of the surface of the natural lens, aspheric, cylindrical, toric lenses
- A61F2/1645—Toric lenses
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/024—Methods of designing ophthalmic lenses
- G02C7/028—Special mathematical design techniques
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/14—Eye parts, e.g. lenses, corneal implants; Implanting instruments specially adapted therefor; Artificial eyes
- A61F2/142—Cornea, e.g. artificial corneae, keratoprostheses or corneal implants for repair of defective corneal tissue
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2240/00—Manufacturing or designing of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2240/001—Designing or manufacturing processes
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- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Cardiology (AREA)
- Mathematical Physics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Prostheses (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Description
により記述でき、ここでBは不明瞭強度である。それは、最も混同の少ない面における等価光屈折デフォーカス(焦点ぼけ)である。
RxCornea=(M,J0,J45);RxSIRC’=(M’,J0’、J45’)
RxXcyl=RxCornea+RxSIRC’=(M+M’,J0+J0’、J45+J45’)
(3)
目全体の場合、目全体の屈折異常は、SEye、CEye、およびαEyeであり、従って、式は次のように書き換えられる。
RxEye=(M,J0,J45);RxSIRC’=(M’,J0’、J45’)
RxXcyl=RxEye+RxSIRC’=(M+M’,J0+J0’、J45+J45’)
CImplant=CF*CXcyl
αImplant=αXcyl
(4)
ここで、CFは、角膜面とインプラント面の間の変換ファクタである。計算された値CImplantおよびαImplantから、適切な円環体インプラントモデルが選択でき、選択されたインプラントは、αImplantにより示される子午線に置かれる。ステップ16で考慮されるベクトル解析は、患者ファクタ12と、外科医ファクタ14の両者を考慮した、計算された術後角膜/眼球乱視18という結果になる。インプラントが眼内レンズ(IOL)であると、角膜面でステップ18において計算される予測円筒異常は、ステップ20におけるインプラント面での要求される円筒異常に変換される。
Lcornea=LRx+Pcornea
(5)
ここで、LRxは、角膜面での眼鏡補正の輻輳である。白内障外科処置後の正常な目では、LRxはゼロに等しい。下記の検討において、特に指定されない限りは、Lcorneaは、Pcorneaと同じと考える。
PIOL=f(Lcornea,PImplant,d,n)=fd,n(Lcornea,PImplant’)
(6)
ここで、dPImplantは、異なる子午線を選択したことによる、球面パワーの変化と考えられ、従って、インプラントの円筒パワーとして対処することができ、同様に、dPImplant’が角膜面におけるインプラントの円筒パワーとして対処でき、dLcorneaが角膜の円筒パワーとして対処できる。直感的に、式(14)は、インプラントの円筒パワーが、角膜面におけるそのパワーと、角膜の円筒パワーの関数であることを意味し、それは式(15)により示される。dPImplant’(CylImplant’)とdLcornea(Cylcornea)の前の係数
と
が定数であると、式(14)は、線形方程式となる。しかし、これらの2つの係数は通常は定数ではなく、PImplant’とLcorneaの関数である。
式(15)において、角膜面における所望のIOL円筒値(CylIOL’)は、CXcylに等しく、角膜円筒(外科的誘発乱視を含むCylcornea)は、補正すべき屈折異常、−CXcylに等しい。
従って、式(15)は、次のように書き換えることができる。
CylImplant=(C1−C2)*CXcyl=CF*CXcyl
(20)
CF=C1−C2は、dと角膜K値に強く依存する。通常の範囲35D〜55D内の角膜パワーに対して、変換ファクタ(CF)は、式(18)と(19)により、dを各関心対象領域の平均値として固定することにより計算できる。
0mm≦d<0.25mmに対してCF=1.00
0.25mm≦d<0.75mmに対してCF=1.02−1.04
0.75mm≦d<1.25mmに対してCF=1.05−1.09
1.25mm≦d<1.75mmに対してCF=1.08−1.14
1.75mm≦d<2.25mmに対してCF=1.11−1.19
2.25mm≦d<2.75mmに対してCF=1.15−1.24
2.75mm≦d<3.25mmに対してCF=1.18−1.30
3.25mm≦d<3.75mmに対してCF=1.21−1.37
3.75mm≦d<4.25mmに対してCF=1.25−1.43
4.25mm≦d<4.75mmに対してCF=1.29−1.51
4.75mm≦d≦5.25mmに対してCF=1.32−1.59
5.25mm<d≦5.75mmに対してCF=1.37−1.67
5.75mm<d≦6.25mmに対してCF=1.41−1.76
6.25mm<d≦6.75mmに対してCF=1.45−1.86
6.75mm<d≦7.25mmに対してCF=1.50−1.97
Claims (3)
- 前記変換ファクタ(CF)は、下記の値
0mm≦d<0.25mmに対してCF=1.00
0.25mm≦d<0.75mmに対してCF=1.02−1.04
0.75mm≦d<1.25mmに対してCF=1.05−1.09
1.25mm≦d<1.75mmに対してCF=1.08−1.14
1.75mm≦d<2.25mmに対してCF=1.11−1.19
2.25mm≦d<2.75mmに対してCF=1.15−1.24
2.75mm≦d<3.25mmに対してCF=1.18−1.30
3.25mm≦d<3.75mmに対してCF=1.21−1.37
3.75mm≦d<4.25mmに対してCF=1.25−1.43
4.25mm≦d<4.75mmに対してCF=1.29−1.51
4.75mm≦d≦5.25mmに対してCF=1.32−1.59
5.25mm<d≦5.75mmに対してCF=1.37−1.67
5.75mm<d≦6.25mmに対してCF=1.41−1.76
6.25mm<d≦6.75mmに対してCF=1.45−1.86
6.75mm<d≦7.25mmに対してCF=1.50−1.97
を具備する請求項1に記載の方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/819,020 US7476248B2 (en) | 2004-04-06 | 2004-04-06 | Method of calculating the required lens power for an opthalmic implant |
PCT/US2005/009725 WO2005099561A2 (en) | 2004-04-06 | 2005-03-23 | Method of calculating the required power of a toric implant |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2007532180A JP2007532180A (ja) | 2007-11-15 |
JP4648384B2 true JP4648384B2 (ja) | 2011-03-09 |
Family
ID=35060186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2007507338A Active JP4648384B2 (ja) | 2004-04-06 | 2005-03-23 | 円環体インプラントの要求されるパワーの計算方法 |
Country Status (16)
Country | Link |
---|---|
US (2) | US7476248B2 (ja) |
EP (1) | EP1732471B2 (ja) |
JP (1) | JP4648384B2 (ja) |
CN (2) | CN101947145B (ja) |
AT (1) | ATE398426T1 (ja) |
AU (1) | AU2005232551B2 (ja) |
BR (1) | BRPI0509637B8 (ja) |
CA (1) | CA2561415C (ja) |
CY (1) | CY1108338T1 (ja) |
DE (1) | DE602005007586D1 (ja) |
DK (1) | DK1732471T4 (ja) |
ES (1) | ES2308472T5 (ja) |
PL (1) | PL1732471T5 (ja) |
PT (1) | PT1732471E (ja) |
SI (1) | SI1732471T2 (ja) |
WO (1) | WO2005099561A2 (ja) |
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