Custom-made contact lenses designed to optimize corneal fit after refractive surgery

Abstract

This invention is a custom-designed contact lens for optimizing the fit of the cornea after refractive surgery. Based on corneal thickness variation data, fixed compensation data is established at multiple radial positions to form a sagittal depth compensation curve on the posterior surface of the lens. This compensation curve is used to adjust the shape of the posterior surface of the lens to compensate for the tear film space between the lens and the eyeball after refractive surgery, so that the tear film volume is maintained within an appropriate range, thereby improving visual quality and enhancing wearing comfort.

Claims

1. A custom-designed contact lens for optimizing corneal shape after refractive surgery, comprising a lens body applied to a pre-existing eyeball undergoing geometric deformation after refractive surgery, wherein: The lens body has a curved front surface on its top surface and a rear surface at the bottom of the lens body that corresponds to the top surface of the preset eyeball. A tear fluid containing space is formed between the rear surface of the lens and the surface of the preset eyeball. The surface of the preset eyeball is geometrically deformed after refractive surgery, causing the tear fluid containing space to have an irregular depth distribution in different areas. To improve the aforementioned irregular tear fluid containing space distribution, the rear surface of the lens is formed based on the compensation result calculated by a corneal deformation regression model, so that the rear surface of the lens has a sagittal depth compensation shape corresponding to the corneal deformation after refractive surgery.

2. The contact lens as described in claim 1, customized for corneal shape optimization and fit after refractive surgery, wherein the corneal deformation regression model is based on LASIK / PRK. A baseline curve was calculated by plotting the average change in corneal thickness caused by the surgery. Here, R represents the radial position, and dT is the reduction in sagittal depth at the posterior surface of the lens. The values ​​are: R = 0.000 mm, dT = -0.113 mm; R = 1.000 mm, dT = -0.105 mm; R = 2.000 mm, dT = -0.082 mm; R = 3.000 mm, dT = -0.043 mm; R = 4.000 mm, dT = -0.005 mm; R = 5.000 mm, dT = -0.006 mm; R = 0.100 mm, dT = -0.112 mm; and R = 1.100 mm, dT = -0.104 mm. When R is 2.100mm, dT is -0.079mm; when R is 3.100mm, dT is -0.038mm; when R is 4.100mm, dT is -0.003mm; when R is 5.100mm, dT is -0.001mm; when R is 0.200mm, dT is -0.112mm; when R is 1.200mm, dT is -0.102mm; when R is 2.200mm, dT is -0.075mm; when R is 3.200mm, dT is -0.034mm; when R is 4.200mm, dT is -0.001mm; when R is 5.200mm, dT is 0.000mm; when R is 0.300mm, dT is - When R is 0.112mm, dT is -0.100mm; when R is 2.300mm, dT is -0.072mm; when R is 3.300mm, dT is -0.029mm; when R is 4.300mm, dT is 0.000mm; when R is 5.300mm, dT is 0.000mm; when R is 0.400mm, dT is -0.111mm; when R is 1.400mm, dT is -0.098mm; when R is 2.400mm, dT is -0.068mm; when R is 3.400mm, dT is -0.025mm; when R is 4.400mm, dT is 0.002mm; when R is 5.400mm... When R is 0.003mm, dT is -0.111mm; when R is 1.500mm, dT is -0.096mm; when R is 2.500mm, dT is -0.064mm; when R is 3.500mm, dT is -0.021mm; when R is 4.500mm, dT is 0.003mm; when R is 5.500mm, dT is 0.005mm; when R is 0.600mm, dT is -0.110mm; when R is 1.600mm, dT is -0.093mm; when R is 2.600mm, dT is -0.060mm; when R is 3.600mm, dT is -0.017mm; when R is 4...When R is 600mm, dT is 0.004mm; when R is 5.600mm, dT is 0.006mm; when R is 0.700mm, dT is -0.109mm; when R is 1.700mm, dT is -0.091mm; when R is 2.700mm, dT is -0.056mm; when R is 3.700mm, dT is -0.014mm; when R is 4.700mm, dT is 0.005mm; when R is 5.700mm, dT is 0.005mm; when R is 0.800mm, dT is -0.108mm; when R is 1.800mm, dT is -0.088mm; when R is... The dT is -0.051mm when R is 2.800mm, -0.011mm when R is 3.800mm, 0.006mm when R is 4.800mm, 0.001mm when R is 5.800mm, -0.107mm when R is 0.900mm, -0.085mm when R is 1.900mm, -0.047mm when R is 2.900mm, -0.008mm when R is 3.900mm, 0.001mm when R is 4.900mm, and 0.000mm when R is 5.900mm.

3. As described in claim 2, a custom-made contact lens for optimizing corneal shape and fit after refractive surgery, wherein the posterior surface of the lens is an axisymmetric structure with the geometric center as the center of rotational symmetry, and is based on the node data with the radial position as the positive direction, extending symmetrically on both sides of the geometric center to construct a complete sagittal depth compensation curve diagram.

4. As described in claim 1, a custom-made contact lens for optimizing corneal shape and fit after refractive surgery, wherein the corneal deformation regression model can be calculated by simulating corneal curvature values: where, K_flat represents the flat meridian curvature value of the cornea after surgery, and K_steep represents the steeper meridian curvature value of the cornea after surgery, in order to calculate the natural curvature of the cornea before refractive surgery.

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