5 results about "Corneal shape" patented technology

The invention relates to the field of ophthalmology medical treatment, and discloses a cornea compression molding device for astigmatism surgical correction. According to the device, a circular ring body is fixedly arranged on the cornea of an eyeball in a sleeving manner, and a ring body connecting handle is connected to the surface of one side of the circular ring body; the upper surface of the circular ring body is provided with scales for referring to the axial direction of astigmatism, visual reference is provided for axial calibration of the astigmatism, and it is ensured that the arc piece can be accurately aligned with the target axial position. The circular ring body is matched with the cornea in size, the positioning cylinder provides a reference for horizontal positioning of the cornea, it is guaranteed that the compression molding direction is accurate, stable supporting is provided for the whole device, and it is guaranteed that the device does not deviate in the compression molding process; the compression molding arc sheet is a compression molding part directly acting on the cornea, and the cornea form is changed through physical extrusion; the pressure adjusting knob is used for accurately adjusting and controlling compression molding pressure; the ring body is connected with the handle so that a doctor can hold conveniently.

This application relates to a femtosecond laser multi-degree-of-freedom personalized reshaping method and system for intracorneal implants, belonging to the field of femtosecond laser processing technology. Utilizing the cold processing characteristics of femtosecond lasers, the intracorneal implant is individually cut and ablated to obtain the desired three-dimensional corneal shape, precisely shaping the curvature, thickness, and contour of the lens to perfectly match the patient's corneal capsule or lesion area. By leveraging the nonlinear optical effect induced at the focal point of the femtosecond laser, the stromal collagen network in the weak areas corresponding to corneal expansion can be densified through laser processing, significantly improving the local elastic modulus and resistance to deformation. In areas requiring a smooth transition with the recipient cornea or adjustment of refractive power, controllable micropores or low-density areas can be induced, appropriately reducing local stiffness, thereby achieving a spatial gradient distribution of internal mechanical properties and customizing the overall mechanical behavior and morphological stability after implantation.

To provide an ophthalmic device that can measure corneal shape without increasing the subject's discomfort due to glare. [Solution] An ophthalmic device for measuring the corneal shape of an eye under examination, comprising: a first projection optical system that projects a first pattern indicator onto the cornea of ​​the eye under examination using invisible light; a second projection optical system that projects a second pattern indicator onto the cornea of ​​the eye under examination using visible light; an anterior segment imaging optical system that receives reflected light from the anterior segment of the eye under examination; and a control unit, wherein the control unit analyzes and processes imaging data obtained by receiving the reflected light of the first pattern indicator projected onto the cornea of ​​the eye under examination by the first projection optical system with the anterior segment imaging optical system to determine whether or not corneal shape measurement of the eye under examination can be performed, and if it is determined that corneal shape measurement is possible, the second projection optical system projects a second pattern indicator onto the cornea of ​​the eye under examination, and analyzes and processes imaging data obtained by receiving the reflected light of the second pattern indicator with the anterior segment imaging optical system to measure the corneal shape.

The invention discloses an orthokeratology lens design method, device and equipment and a storage medium, and belongs to the field of orthokeratology lens design. The method comprises the steps that firstly, measurement data including diopter and corneal morphology are acquired, and if the diopter and the corneal morphology meet a first judgment condition, the orthokeratology lens is determined to be the orthokeratology lens; if yes, geometric parameters of the orthokeratology lens are designed based on a continuous aspheric surface design method and the measured data, otherwise, the geometric parameters are designed based on a double inverse geometric design method and the measured data, and finally the geometric parameters of the orthokeratology lens are output. Therefore, by means of the orthokeratology lens design method, the problem that the presbyopia correction effect is poor in the current orthokeratology lens design method can be solved.

Apparatus and methods for eye tracking using an optical coherence tomography (OCT) device are disclosed. Such eye tracking may be performed by using information about the shape of the cornea and the corneal apex or using the iris / pupil border obtained using the OCT device.