US5056522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supersonic ophthalmic measuring apparatus
Assignee: Canon Inc
•
Filing: 1990-12-28
•
Granted: 1991-10-15
•
Expires: 2010-12-28
Abstract
Abstract A supersonic ophthalmic measuring apparatus includes a supersonic probe for contacting the cornea of an eye to be examined. A calculator for calculating the amount of depression of the cornea of the eye to be examined caused by the supersonic probe, and a corrector for correcting the result of the measurement of the eye axis length of the eye to be examined by the supersonic probe by the amount of depression.
Inventors
- 👤 Isao Matsumura
- 👤 Takashi Masuda
- 👤 Yoshimasa Hamano
- 👤 Shigeo Maruyama
- 👤 Yukitsugu Nakamura
- 👤 Kazunobu Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:10
CPC Classifications
A; A61; A61B; A61B8/00; A61B8/10; A61B3/00; A61B3/10; A61B3/16; A61B8/42; A61B8/4209
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
105 words
A supersonic ophthalmic measuring apparatus comprising: measuring means for measuring a distance from the cornea of an eye to be examined to a predetermined region of the eye to be examined by a supersonic wave emitted by a supersonic probe which contacts and depresses the cornea of the eye to be examined; calculating means for quantitatively calculating an amount of depression of the cornea of the eye to be examined caused by the supersonic probe; and correcting means for correcting the measurement of said measuring means by adding the amount of depression calculated by said calculating means to the distance measured by said measuring means.
Claim 2
Dependent Claim
105 words
A supersonic ophthalmic measuring apparatus comprising: measuring means for measuring a distance from the cornea of an eye to be examined to a predetermined region of the eye to be examined by a supersonic wave emitted by a supersonic probe which contacts and depresses the cornea of the eye to be examined; calculating means for quantitatively calculating an amount of depression of the cornea of the eye to be examined caused by the supersonic probe; and correcting means for correcting the measurement of said measuring means by adding the amount of depression calculated by said calculating means to the distance measured by said measuring means.
Claim 3
Dependent Claim
34 words
A supersonic ophthalmic measuring apparatus according to claim 1, wherein said calculating means comprises means for detecting the size of the area of contact between the supersonic probe and the cornea of the eye.
Claim 4
Dependent Claim
25 words
A supersonic ophthalmic measuring apparatus according to claim 2, further comprising means for forming the image of said area of contact itself on a sensor.
Claim 5
Dependent Claim
42 words
A supersonic ophthalmic measuring apparatus according to claim 2, further comprising means for projecting an index mark onto said area of contact, and a means for forming a reflected image of said index mark from said area of contact on a sensor.
Claim 6
Dependent Claim
31 words
A supersonic ophthalmic measuring apparatus according to claim 2, wherein said calculating means further comprises means for detecting the radius of curvature of the cornea of the eye to be examined.
Claim 7
Dependent Claim
36 words
A supersonic ophthalmic measuring apparatus according to claim 1, wherein said calculating means calculates the amount of depression by a pressure force which presses the supersonic probe against the cornea of the eye to be examined.
Claim 8
Dependent Claim
66 words
A supersonic ophthalmic measuring apparatus according to claim 1, wherein said calculating means comprises means for detecting a position in which the supersonic probe starts to contact the cornea of the eye to be examined, and means for detecting the amount of displacement of the position of the supersonic probe during measurement from said position in which said supersonic probe starts to contact with said cornea.
Claim 9
Dependent Claim
21 words
An ophthalmic measuring apparatus according to claim 1, wherein said predetermined region is the fundus of the eye to be examined.
Claim 10
Dependent Claim
40 words
An ophthalmic measuring apparatus according to claim 1, further comprising: projection means for projecting an index light beam onto the cornea of an eye to be examined; and detecting means for detecting the corneal reflection of said index light beam.
Claim 11
Dependent Claim
153 words
An ophthalmic measuring apparatus comprising: projection means for projecting an index light beam onto the cornea of an eye to be examined; first measuring means for detecting the corneal reflection of said index light beam and measuring the shape of said index light beam and measuring the shape of the cornea; second measuring means for measuring a distance from the cornea of the eye to be examined to a predetermined region of the eye to be examined by a supersonic wave emitted by a supersonic probe which contacts and depresses the cornea of the eye to be examined; calculating means for quantitatively calculating an amount of depression of the cornea of the eye to be examined caused by the supersonic probe; and correcting means for correcting the measurement made by said second measuring means by adding the amount of depression calculated by said calculating means to the distance measured by said measuring means.
Claim 12
Dependent Claim
153 words
An ophthalmic measuring apparatus comprising: projection means for projecting an index light beam onto the cornea of an eye to be examined; first measuring means for detecting the corneal reflection of said index light beam and measuring the shape of said index light beam and measuring the shape of the cornea; second measuring means for measuring a distance from the cornea of the eye to be examined to a predetermined region of the eye to be examined by a supersonic wave emitted by a supersonic probe which contacts and depresses the cornea of the eye to be examined; calculating means for quantitatively calculating an amount of depression of the cornea of the eye to be examined caused by the supersonic probe; and correcting means for correcting the measurement made by said second measuring means by adding the amount of depression calculated by said calculating means to the distance measured by said measuring means.
Claim 13
Dependent Claim
175 words
An ophthalmic measuring apparatus comprising: first measuring means for measuring a distance from the cornea of an eye to be examined to a predetermined region of the eye to be examined by a supersonic wave emitted by a supersonic probe which contacts and depresses the cornea of the eye to be examined; first calculating means for quantitatively calculating an amount of depression of the cornea of the eye caused by the supersonic probe; correcting means for correcting the measurement made by said first measuring means by adding the amount of depression calculated by said first calculating means to the distance measured by said first measuring means; applanation means for pressing the supersonic probe against the cornea of the eye to be examined; second measuring means for measuring the area of applanation and a pressure force of the cornea of the eye to be examined pressed by said applanation means; and second calculating means for calculating the eye pressure of the eye to be examined on the basis of the output of said second measuring means.
Claim 14
Dependent Claim
175 words
An ophthalmic measuring apparatus comprising: first measuring means for measuring a distance from the cornea of an eye to be examined to a predetermined region of the eye to be examined by a supersonic wave emitted by a supersonic probe which contacts and depresses the cornea of the eye to be examined; first calculating means for quantitatively calculating an amount of depression of the cornea of the eye caused by the supersonic probe; correcting means for correcting the measurement made by said first measuring means by adding the amount of depression calculated by said first calculating means to the distance measured by said first measuring means; applanation means for pressing the supersonic probe against the cornea of the eye to be examined; second measuring means for measuring the area of applanation and a pressure force of the cornea of the eye to be examined pressed by said applanation means; and second calculating means for calculating the eye pressure of the eye to be examined on the basis of the output of said second measuring means.
Claim 15
Dependent Claim
49 words
An ophthalmic measuring apparatus according to claim 11, wherein said applanation means depresses the cornea by an amount, when the eye pressure is measured, which is larger than the deformation amount of the cornea when the distance from the cornea to the predetermined region of the eye is measured.
Claim 16
Dependent Claim
47 words
An ophthalmic measuring apparatus according to claim 11, further comprising: projection means for projecting an index light beam onto the cornea of the eye to be examined; and means for detecting the corneal reflection of said index light beam and for measuring the shape of the cornea.
References Cited (Backward Citations)
US3394462A
Cited
US3934462A
Cited
US4666269A
Cited
US4564018A
Cited
US4508121A
Cited
US4770523A
Cited
US4764006A
Cited
US4766904A
Cited
WO1989012424A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-14 | 1995-04-15 | 1995-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-14 | 1999-04-15 | 1999-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-14 | 2003-04-15 | 2003-10-15 | $7700.00 | Window Closed / Lapsed |