Abrégé

A system (10) and method to compensate for the deformation of an eye (20) requires calculation of an induced deformation angle, wherein the deformation is intentionally induced during laser surgery by a contact lens (14), and a refraction angle. Specifically, during laser surgery, the cornea (18) of an eye is typically stabilized by a contact lens. This deforms the cornea. When the contact lens is removed after the surgery, the cornea recovers from the deformation. For the present invention, the induced deformation angle is calculated, and corrected by the refraction angle, so that surfaces altered during surgery (e.g. by LIOB) will become substantially parallel to incoming light in the eye, after the contact lens has been removed after surgery.

Classes IPC  ?

• A61F 9/01 - Traitement de la cornée
• A61F 9/011 - Procédés ou dispositifs invasifs

Abrégé

A system (10) and method for altering the configuration of a transparent material (e.g. the cornea (20) of an eye) requires identifying local stress distribution patterns inside the material. These patterns are then used to define boundary (interface) surfaces between volumes within the material. In operation, a laser unit performs Laser Induced Optical Breakdown (LIOB) along selected boundary surfaces (54) to disrupt stress distribution patterns between volumes of the material that are separated from each other by the boundary surface. This LIOB allows an externally applied force (26) to thereby alter the configuration of the material (20).

Classes IPC  ?

• A61F 9/01 - Traitement de la cornée

Abrégé

A system and method for simulating a corneal reconfiguration in response to LIOB uses a computer-programmed, finite element model. The model has a plurality of elements; with each element pre-programmed with coefficients based on diagnostic corneal data. Collectively the coefficients replicate biomechanical properties of the cornea. In use, designated biomechanical characteristics on a plurality of selected elements (i.e. selected coefficients) are minimized to simulate LIOB in an actual cornea. A computer then measures the resultant reconfiguration of the cornea model to assess an actual cornea's response to LIOB.

Classes IPC  ?

• G06F 19/00 - Équipement ou méthodes de traitement de données ou de calcul numérique, spécialement adaptés à des applications spécifiques (spécialement adaptés à des fonctions spécifiques G06F 17/00;systèmes ou méthodes de traitement de données spécialement adaptés à des fins administratives, commerciales, financières, de gestion, de surveillance ou de prévision G06Q;informatique médicale G16H)

Abrégé

A system and method for altering the shape of a lamina of transparent material (e.g. the cornea of an eye), as it is being subjected to a transverse pressure differential, requires a computer controlled laser unit. In accordance with specified input parameters, the computer directs the laser unit to perform LIOB over predetermined surfaces within the lamina. This weakens the material for a desired reshaping of the lamina in response to the pressure differential. With respect to a perpendicular axis that is defined by the lamina, surfaces parallel to the axis (e.g. cylindrical surfaces) are separated from each other by about two hundred microns. For surfaces perpendicular to the axis, the separation is about ten microns. In each instance, the cuts that result from LIOB are only about two microns thick.

Classes IPC  ?

• A61F 9/01 - Traitement de la cornée

Abrégé

A system and method are provided for simulating a Laser Induced Optical Breakdown (LIOB) protocol to establish a surgical LIOB treatment for a patient. In the system, a library of finite element models characterizing various visual defects in corneas are programmed into a computer. Further, a library of nomograms indicating specific LIOB protocols for correcting respective visual defects are programmed into the computer. As a result, a model and a corresponding nomogram may be selected in view of a patient's diagnostic information. Further, the selected model may be individualized with the diagnostic information to more precisely characterize the patient's visual defects. Thereafter, the computer simulates the indicated LIOB protocol on the individualized model in order to achieve a desired corneal configuration. When the desired corneal configuration is achieved, the final treatment plan may be determined.

Classes IPC  ?

• G06F 19/00 - Équipement ou méthodes de traitement de données ou de calcul numérique, spécialement adaptés à des applications spécifiques (spécialement adaptés à des fonctions spécifiques G06F 17/00;systèmes ou méthodes de traitement de données spécialement adaptés à des fins administratives, commerciales, financières, de gestion, de surveillance ou de prévision G06Q;informatique médicale G16H)

Classes IPC  ?

• A61F 9/01 - Traitement de la cornée

Classes IPC  ?

• A61F 9/01 - Traitement de la cornée

Abrégé

A method for performing intrastromal ophthalmic laser surgery requires Laser Induced Optical Breakdown (LIOB) of stromal tissue without compromising Bowman's capsule (membrane). In detail, the method creates cuts in the stroma along planes radiating from the visual axis of the eye. Importantly, these cuts are all distanced from the visual axis. The actual location and number of cuts in the surgery will depend on the degree of visual aberration being corrected. Further, the method may include the additional step of creating cylindrical cuts in the stroma. The radial cuts and cylindrical cuts may be intersecting or non-intersecting depending on the visual aberration being treated.

Classes IPC  ?

• A61F 9/01 - Traitement de la cornée

Produits et services

SOFTWARE USED IN OPHTHALMOLOGICAL and OPTOMETRIC INSTRUMENTS, NAMELY, CORNEAL TOPOGRAPHER, ABERROMETER and LASERS, ALL SOLD AS A UNIT and USED FOR THE DIAGNOSIS OF EYE CONDITIONS and VISION CORRECTION

Produits et services

ABERROMETER THAT MEASURES ABERRATIONS OF OPTICAL SYSTEMS, INCLUDING THE EYE ABERROMETER USED IN EYE SURGERY AND VISION CORRECTION

Produits et services

keratome blades

Produits et services

surgical devices, namely, keratomes used in performing surgery on an eye

Produits et services

ophthalmic and optometric instruments for making both, measurements of surfaces and other portions of the eye and for performing diagnosis of the eye

Produits et services

lasers for medical use and calibration plates therefor