US4947871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process the surgical correction of ametropia of one or both eyes of living beings
Assignee: Alcon Grieshaber AG
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Filing: 1988-07-18
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Granted: 1990-08-14
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Expires: 2008-07-18
Abstract
Abstract A process and an apparatus for the surgical correction of ametropia, which can occur as a function of the corneal curvature in the optical system of one or both eyes of living beings, are proposed. The apparatus includes a grinder essentially comprising a base member to be fixed to the eye and a rotary-driven grinding or polishing punch. A displacement of the focal point in the retinal plane is achieved and consequently the ratio of the optical axis to the refractive force of the eye is corrected by grinding and/or polishing the cornea surface in the optical curvature region.
Inventors
- 👤 Hans R. Grieshaber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:19
CPC Classifications
A; A61; A61F; A61F9/00; A61F9/007; A61F9/013; A61B; A61B17/00; A61B17/32; A61B2017/320004
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
Process for the surgical correction of ametropia, particularly such ametropia in the optical system of one or both eyes of living beings, which is dependent on a corneal curvature, comprising the following steps: (a) determining the refraction of the individual ametropic eye; (b) determining a corneal curvature of the eye; (c) calculating a correction radius (r) of the corneal curvature from a value of the corneal curvature determined in the step (b); (d) calculating a grinding depth, whilst taking into account the corneal curvature and correction radius (r) determined in the steps (b) and (c); (e) determining the optical center (Z) of the cornea; and (f) grinding or polishing the cornea in its optical curvature region for a displacement of the focal point in the retinal plane correcting the ratio of the optical axis to the refractive force.
Claim 2
Dependent Claim
138 words
Process for the surgical correction of ametropia, particularly such ametropia in the optical system of one or both eyes of living beings, which is dependent on a corneal curvature, comprising the following steps: (a) determining the refraction of the individual ametropic eye; (b) determining a corneal curvature of the eye; (c) calculating a correction radius (r) of the corneal curvature from a value of the corneal curvature determined in the step (b); (d) calculating a grinding depth, whilst taking into account the corneal curvature and correction radius (r) determined in the steps (b) and (c); (e) determining the optical center (Z) of the cornea; and (f) grinding or polishing the cornea in its optical curvature region for a displacement of the focal point in the retinal plane correcting the ratio of the optical axis to the refractive force.
Claim 3
Dependent Claim
26 words
Process according to claim 1, wherein during said grinding or polishing step, the cornea surface or a grinding member is cooled with a suitable cooling medium.
Claim 4
Dependent Claim
14 words
Process according to claim 2, wherein said suitable cooling medium includes visco elastic substances.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |