摘要:
A device for determining biometric variables of the eye, as are incorporated in the calculation of intraocular lenses including a multi-point keratometer and an OCT arrangement. The keratometer measurement points are illuminated telecentrically and detected telecentrically and the OCT arrangement is designed as a laterally scanning swept-source system with a detection region detecting the whole eye over the whole axial length thereof. The multi-point keratometer ensures that a sufficient number of keratometer points are available for measuring the corneal surface. By contrast, telecentricity ensures that the positioning inadequacies of the measuring instrument in relation to the eye to be measured do not lead to a local mismatch of the reflection points. The swept-source OCT scan detects the whole eye over the length thereof so that both anterior chamber structures and retina structures can be detected and a consistent whole eye image can be realized.
摘要:
The invention concerns an injector tip (7) for an ocular lens injector device (1), the injector tip having an injection duct (16) with a front (9) and a rear end (8) and being bounded by an inner wall (17), wherein at the inner wall (17) an inwardly extending step (18) is formed only along part of the entire length between the front (9) and the rear end (8) of the injection duct (16) and ends at a distance from the front end (9) of the injection duct (16). The invention also relates to an ocular lens injector device (1) with an injector tip (7).
摘要:
An artificial lens for an eye (10) is described. According to the present invention, an artificial lens for an eye is now provided, in which the focal width can change. This is realized according to the invention by providing the artificial lens with two or more media (12, 13) that are flexible in shape as lens elements and that the two media that are flexible in shape stand in direct contact with one another. The media that are flexible in shape are preferably disposed in an uptake container forming a lens body (11).
摘要:
A method of operating an eye surgery system comprises operating actuators of a stand such that an apparatus for measuring the refraction of an eye is located in a measurement position relative to the eye; measuring at least one condition of the eye and determining at least one condition value representing the at least one measured condition of the eye; measuring the refraction of the eye and determining at least one refraction value presenting the measured refraction of the eye, wherein a time distance between the measuring of the condition of the eye and the measuring of the refraction of the eye is smaller than a predetermined duration; and outputting the at least one refraction value representing the measured refraction of the eye only when the condition value representing the measured condition of the eye is within a predetermined range of values.
摘要:
An illumination device for an optical viewing apparatus has a light source including a first individual light source and a second individual light source arranged in a plane. The first individual light source has a first midpoint and the second individual light source has a second midpoint. An axial direction is defined by a vector from the second midpoint to the first midpoint. An illumination optical unit defines an optical axis which is arranged perpendicularly to the plane and intersects the plane at an intersection point. The light source is imaged toward infinity by the illumination optical unit. The first individual light source has an extent along the axial direction. The midpoint is offset by an amount (Δ) in a positive direction along the axial direction relative to the intersection. The relationship 0.1*L1≦Δ≦1*L1 is satisfied for the offset.
摘要:
A method for precise working of material, particularly organic tissue, comprises the step of providing laser pulses with a pulse length between 50 fs and 1 ps and with a pulse frequency from 50 kHz to 1 MHz and with a wavelength between 600 and 2000 nm for acting on the material to be worked. Apparatus, in accordance with the invention, for precise working of material, particularly organic tissue comprising a pulsed laser, wherein the laser has a pulse length between 50 fs and 1 ps and with a pulse frequency of from 50 kHz to 1 MHz is also described.
摘要:
The present invention relates in particular to methods and apparatuses for generating and/or providing X-ray radiation with specific radiation characteristics, in particular with a specific radiation dose rate curve (10). In order to provide simple and cost efficient solution, it is provided according to the invention, that the X-ray radiation is generated and/or provided, by composing and/or adapting the X-ray radiation with the specific radiation characteristics, in particular with the specific radiation dose rate curve (10), proportionally from a first specification X-ray radiation with a defined first radiation characteristics, in particular with a predetermined first radiation dose rate curve (11) and a second specification X-ray radiation, which is different from the first specification X-ray radiation, with defined second radiation characteristics, in particular with a predetermined second radiation dose rate curve (12).
摘要:
An imaging apparatus and method are provided. The probe for an imaging apparatus includes a manually manipulable proximal portion; a straight distal portion with a distal tip for locating at a site to define an observational field; and a curved portion between the proximal portion and the distal portion. The imaging method includes the steps of locating a distal tip of an imaging probe at a site to define an observational field; irradiating the observational field from the distal tip; and collecting a return signal at the distal tip; wherein the probe comprises a manually manipulable proximal portion. The apparatus and method provided herein are useful for various applications including but not limited to endomicroscopy and other microsurgical procedures performed under optical stereoscopic magnified visualization, such as neurosurgery, ENT/facial surgery and spinal surgery.
摘要:
A method and device to stabilize the cornea with fewer adverse effects. In particular, a greater stability and shorter treatment time are to be made possible. To this end, the cornea is locally irradiated successively at different sites so that collagen fibers are indirectly or directly crosslinked at the irradiated sites. In this way, the collagen fibers are advantageously crosslinked in a spatially resolved manner. Accordingly, the entire eye need not be irradiated with tissue-damaging UV light, and regions having a weaker structure can be locally stabilized selectively. The sites of the cornea are preferably irradiated so that the collagen fibers are ionized in each instance by photoabsorption of a plurality of photons which each have an energy below an ionizing energy of a given molecule. After a short treatment period, strong covalent bonds are formed directly between the collagen fibers. Crosslinking agents need not be used.
摘要:
A system and method for optical coherence elastography of tissue of an eye. The method includes introducing a probe into the eye, the probe including a vibration element, generating time resolved images of the tissue of the eye located posterior the vibration element of the probe by optical coherence tomography, exciting the vibration element to ultrasonic vibrations making the tissue vibrate or oscillate, measuring a displacement of the tissue in the time resolved images, and calculating elasticity values of the tissue from the displacement.