Preparation method of remolded lens

Abstract

The invention relates to the technical field of ophthalmic medical lenses, and provides a preparation method of a remolded lens, and the preparation method of the remolded lens comprises the steps: S1, calculating the diopter of an original lens after SMILE operation; s2, adjusting the hydration rate of the original lens to a preset hydration rate threshold value; s3, a cutting parameter array graph is constructed, the cutting parameter array graph comprises the cutting diopter, and the cutting diopter is calculated in the following mode that # imgabs0 # Rt is the target lens diopter, R1 is the original lens diopter, E is the preset laser cutting efficiency, and A is the cutting diopter; and S4, cutting the original lens according to the cutting parameter array diagram to obtain a target lens. According to the application, the waste lens can be effectively recovered and treated, so that the lens is reused for patients with myopia, presbyopia, refractive fallback and corneal expansion.

Description

Technical Field

[0001] The present application relates to the technical field of ophthalmic medical lenses, and in particular to a method for preparing a reshaped lens. Background Art

[0002] Refractive error is a significant disease burden, including 2.6 billion people with myopia, 1.8 billion with presbyopia, and 10 million with uncorrectable corneal diseases. Globally, SMILE surgeries to correct myopia have exceeded 10 million and are still increasing. The removed lenses, a byproduct of surgery, are often discarded as waste, resulting in significant waste and hindering the potential recycling of these lenses. Existing technologies are unable to effectively recycle these lenses and cannot precisely adjust their refractive power. Summary of the Invention

[0003] In order to help solve the above technical problems, the present application provides a method for preparing a reshaped lens, which adopts the following technical solution:

[0004] A method for preparing a reshaped lens, wherein the method for preparing the reshaped lens comprises:

[0005] Step S1: Calculate the refractive power of the original lens after SMILE surgery by:

[0006] Formula 1: Where t0 is the thickness of the original lens, d is the diameter of the optical zone of the original lens, n is the corneal refractive index, and D is the diopter of the original lens;

[0007] Step S2: adjusting the hydration rate of the original lens to a preset hydration rate threshold;

[0008] Step S3: Constructing a cutting parameter array diagram, wherein the cutting parameter array diagram includes the diameter of the cutting optical zone, the cutting thickness, the cutting diopter, and the diopter of the target lens. The diameter of the cutting optical zone is preset, the cutting thickness is set based on cutting the central thickness of the original lens to a preset central thickness cutting threshold, the diopter of the target lens is preset, and the cutting diopter is calculated by the following method:

[0009] Rt is the target lens diopter, Rl is the original lens diopter, E is the preset laser cutting efficiency, and A is the cutting diopter;

[0010] Step S4: cutting the original lens according to the cutting parameter array diagram to obtain a target lens.

[0011] Preferably, the step S1 includes:

[0012] The lens is scanned by optical coherence tomography to obtain the thickness of the original lens, the diameter of the original lens optical zone and the corneal refractive index, formula 2:

[0013]

[0014] Wherein, t0 is the thickness of the original lens, d is the diameter of the optical zone of the original lens, n is the corneal refractive index, D is the refractive power of the original lens, and R1 is the lens curvature. Formula 2 is simplified to Formula 1 through binomial expansion.

[0015] Preferably, the step S2 includes:

[0016] The original lens is placed on the contact lens surface, and after drying, a hydration solution is added dropwise to make the hydration rate of the original lens reach a preset hydration rate threshold.

[0017] Preferably, the step S3 includes: the cutting parameter array diagram includes the diopter of the original lens, the thickness of the original lens, the diameter of the optical zone of the original lens, the diameter of the cut optical zone, the cut thickness, the cut diopter and the diopter of the target lens.

[0018] Preferably, the preset hydration rate threshold is 1, the diameter of the preset cutting optical zone is 5 mm, the preset laser cutting efficiency is 0.8, and the refractive power of the target lens is in the myopia refractive power range, the presbyopia refractive power range, and the refractive regression and corneal expansion refractive power range.

[0019] In summary, the preparation method of the reshaped lens of the present application can effectively recycle and process discarded lenses. The refractive power of the discarded lenses can be corrected to a preset range through the set algorithm. These lenses can be reused for patients with myopia, presbyopia, refractive regression and corneal ectasia. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a flow chart of an embodiment of a method for preparing a reshaped lens of the present application. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the accompanying drawings. The structure and principle of the present invention will be very clear to those skilled in the art. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention.

[0022] Figure 1 This is a flow chart of an embodiment of a method for preparing a reshaped lens of the present application.

[0023] The preparation method of the reshaped lens of the present application comprises:

[0024] Step S1: Calculate the refractive power of the original lens after SMILE surgery by:

[0025] Formula 1: Where t0 is the thickness of the original lens, d is the diameter of the optical zone of the original lens, n is the corneal refractive index, and D is the refractive power of the original lens.

[0026] The lens is scanned by optical coherence tomography to obtain the thickness of the original lens, the diameter of the original lens optical zone and the corneal refractive index, formula 2:

[0027]

[0028] Wherein, t0 is the thickness of the original lens, d is the diameter of the optical zone of the original lens, n is the corneal refractive index, D is the refractive power of the original lens, and R1 is the lens curvature. Equation 2 is simplified to Equation 1 through the binomial expansion.

[0029] Step S2: Adjusting the hydration rate of the original lens to a preset hydration rate threshold. Place the original lens on the contact lens surface, dry it, and then drip a hydration solution to adjust the hydration rate of the original lens to the preset hydration rate threshold.

[0030] In step S2, the SMILE lens is removed and placed on a contact lens (Carl Zeiss Meditec AG, Jena, Germany), flattened with a sponge, and allowed to dry in a constant temperature and humidity environment (21°C, 50%). After drying, Optisol GS (Baush and Lomb, Irvine, CA) is added dropwise for 5 minutes to achieve an appropriate hydration level (hydration ratio H = 1). It should be noted that the appropriate hydration level can also be determined as follows: ALT = PLT or ALD = PLD. ALT is the central lens thickness measured by OCT; PLT is the value calculated by VisuMax software; ALD is the lens diopter measured by OCT; and PLD is the value obtained by VisuMax software.

[0031] Step S3: Constructing a cutting parameter array diagram, the cutting parameter array diagram includes the diopter of the original lens, the thickness of the original lens, the diameter of the optical zone of the original lens, the diameter of the cut optical zone, the cutting thickness, the cutting diopter, and the diopter of the target lens. The cutting thickness is set based on cutting the central thickness of the original lens to a preset central thickness cutting threshold. The diopter of the target lens is preset, and the cutting diopter is calculated by the following method:

[0032] Rt is the target lens diopter, Rl is the original lens diopter, E is the preset laser cutting efficiency, and A is the cutting diopter.

[0033] For example, the refractive power of the original lens obtained by SMILE is 8D. After laser cutting -15D, the target lens can be obtained: 8+(-15)×0.8=-4, and the target lens with a refractive power of -4D can be obtained.

[0034] The cutting parameter array diagram is as follows:

[0035]

[0036] Step S4: Cut the original lens according to the cutting parameter array diagram to obtain the target lens. During cutting, use a sponge to absorb the liquid on the lens surface, align the laser to the center of the lens, and perform PRK / LASIK mode laser cutting. After cutting, the lens is immersed in a balanced salt solution for transplantation.

[0037] In this embodiment, the preset hydration rate threshold is 1, the preset diameter of the cutting optical zone is 5 mm, the preset laser cutting efficiency is 0.8, and the refractive power of the target lens is in the myopia refractive power range (-1D to -20D), the presbyopia refractive power range (+1D to +2D), and the refractive regression and corneal expansion refractive power range (corneal curvature K is less than 70D).

Claims

1. A method for preparing a reshaped lens, characterized in that: The method for preparing the reshaped lens comprises: Step S1: Calculate the refractive power of the original lens after SMILE surgery; Step S2: adjusting the hydration rate of the original lens to a preset hydration rate threshold; Step S3: Constructing a cutting parameter array diagram, wherein the cutting parameter array diagram includes the diameter of the cutting optical zone, the cutting thickness, the cutting diopter, and the diopter of the target lens. The diameter of the cutting optical zone is preset, the cutting thickness is set based on cutting the central thickness of the original lens to a preset central thickness cutting threshold, the diopter of the target lens is preset, and the cutting diopter is calculated by the following method: Rt is the target lens diopter, Rl is the original lens diopter, E is the preset laser cutting efficiency, and A is the cutting diopter; Step S4: cutting the original lens according to the cutting parameter array diagram to obtain a target lens.

2. The method for preparing a reshaped lens according to claim 1, wherein: The step S1 comprises: calculating the refractive power of the original lens after SMILE surgery by the following method: Formula 1: Where t0 is the thickness of the original lens, d is the diameter of the optical zone of the original lens, n is the corneal refractive index, and D is the refractive power of the original lens.

3. The method for preparing a reshaped lens according to claim 2, wherein: The step S1 includes: scanning the lens by optical coherence tomography to obtain the thickness of the original lens, the diameter of the optical zone of the original lens and the corneal refractive index, as shown in Formula 2: Wherein, t0 is the thickness of the original lens, d is the diameter of the optical zone of the original lens, n is the corneal refractive index, D is the refractive power of the original lens, and R1 is the lens curvature. Formula 2 is simplified to Formula 1 through binomial expansion.

4. The method for preparing a reshaped lens according to claim 1, wherein: The step S2 includes: placing the original lens on the contact lens surface, and dripping a hydration solution after drying to make the hydration rate of the original lens reach a preset hydration rate threshold.

5. The method for preparing a reshaped lens according to claim 1, wherein: The step S3 includes: the cutting parameter array diagram includes the diopter of the original lens, the thickness of the original lens, the diameter of the optical zone of the original lens, the diameter of the cut optical zone, the cut thickness, the cut diopter and the diopter of the target lens.

6. The method for preparing a reshaped lens according to claim 1, wherein: The preset hydration rate threshold is 1, the preset diameter of the cutting optical zone is 5 mm, the preset laser cutting efficiency is 0.8, and the refractive power of the target lens is in the myopia refractive power range, the presbyopia refractive power range, and the refractive regression and corneal expansion refractive power range.

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