Surgery – Truss – Pad
Patent
1994-06-09
1996-03-26
Sykes, Angela D.
Surgery
Truss
Pad
351200, A61B 316
Patent
active
055012175
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a contact lens for intraocular observation for use in diagnosis, treatment or the like with respect to an eyeball and, in particular, to a contact lens for intraocular observation which is advantageously used for observation, examination, operation or the like on an angle portion in an eyeball.
BACKGROUND ART
An angle portion is situated at peripheral edge of anterior chamber of an eyeball and of which abnormalities such as too wide or too narrow angle, open or closure angle and adhesion are related to intraocular pressure, occurrence of glaucoma or the like. In ophthalmology, therefore, examination on such angle portion is prevailing.
Since direct observation on an angle portion is difficult, it has hitherto been a usual practice to use a contact lens for gonioscopy as disclosed in Japanese Examined Patent Publication No. 13039/1974. However, when there is a closure or adhesion in the angle portion of a subject, even such a contact lens cannot allow observation on the inner part of the angle portion.
Therefore, usually, the angle portion of a subject is firstly observed using a contact lens for gonioscopy, and then, if closure or adhesion is found in the angle portion, an indentation gonioscopy 4 provided therein with a lens 2 as shown in FIGS. 7 and 8 is used to further observe the angle portion. A tip face 6 of the indentation gonioscopy 4 is brought into contact with the cornea of the subject and made to press it so as to enlarge the angle portion thereby allowing observation thereon.
With such a conventional technique, however, the observation work has been troublesome while at the same time inflicting much pain on a subject because the contact lens for gonioscopy should be changed with the indentation gonioscopy as required.
Further, an indentation gonioscopy of the conventional type is adapted to press a part of cornea periphery so as to enlarge a part of angle portion on the opposite side of the pressed part thereby allowing observation. Hence, it is likely that there is produced local strain or wrinkle in the cornea during the pressing operation, thus making observation unclear. Accordingly, the conventional gonioscope has involved a problem of difficulty in observation.
In addition, such an indentation gonioscopy is likely to slip on a subject eye upon pressing it; hence, it is very difficult to continuously press the target pressing position of cornea of an eyeball for observation. Accordingly, the conventional indentation gonioscopy has involved another problem of requiring a high technique and skill for observation.
The present invention has been made with the background of the foregoing circumstances. Thus, it is an object of the present invention to provide a contact lens for intraocular observation of very good operability, with which, besides observation on a subject eye in a normal state, observation can be made on the inner part of an angle portion as required if there is a closure or adhesion, while at the same time generation of strain or wrinkle in the cornea of a subject eye during observation can be advantageously avoided and a slip on the subject eye can be effectively prevented.
DISCLOSURE OF INVENTION
A contact lens for intraocular observation of the present invention is characterized by comprising a lens body having a contact face to be brought into contact with cornea of an eyeball of a subject, and a lens support having a contact portion to be settled on sclera of the eyeball of the subject, the lens body and the lens support being assembled on each other by means of a slide mechanism so as to be movable relative to each other in the axial direction of lens, wherein the lens body is capable of pressing the cornea of the eyeball of the subject by movement thereof in the axial direction of lens relative to the lens support settled on the sclera of the eyeball of the subject.
In such a contact lens for intraocular observation, preferably, the contact face of the lens body is of a substantially circular, spherical concave sha
REFERENCES:
patent: 3487679 (1970-01-01), Yamamori
patent: 3832891 (1974-09-01), Stuckey
patent: 4766904 (1988-08-01), Kozin et al.
Ishiguro Shinji
Morino Toshiharu
Lacyk John P.
Sykes Angela D.
Tomey Corporation
LandOfFree
Contact lens for intraocular observation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Contact lens for intraocular observation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contact lens for intraocular observation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-910609