Eyeglass Lens Coating Thickness for Myopia Control
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Solution Overview
Problem
The formation of a coating film on the surface of eyeglass lenses with minute convex portions can deteriorate the effectiveness of near-sightedness suppression.
Innovation Solution
The coating film is designed to closely follow the shape of the base material convex portions, with a thickness of 3.0 μm or less, ensuring that rays converge at a position closer to the object than the predetermined position A, thereby maintaining the suppression of near-sightedness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating film is formed on the surface with base material convex portions, then the lens gains protective and optical properties, but the near-sightedness suppression function deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the coating film thickness to be 3.0 μm or less and adjusting the refractive index to be within 1.45 to 1.65. These parameter modifications ensure that the coating film maintains the convex portion shape and optical properties necessary for near-sightedness suppression while still providing protective functions.
Solution Approach 2:
The patent applies local quality by ensuring the coating film faithfully follows the shape of the base material convex portions, creating a coating film convex portion with specific local optical properties. This localized approach maintains the functional integrity of the convex portions while applying the coating film.
2Strength
If the coating film thickness is increased, then the protective properties improve, but the shape fidelity of convex portions deteriorates
Solution Approach 1:
The patent sets the coating film thickness parameter to 3.0 μm or less to maintain shape fidelity. This parameter constraint ensures that the coating film convex portion faithfully follows the base material convex portion shape, preserving the optical function while providing adequate protective properties.
3Illumination intensity
If the refractive index of the coating film is increased, then the optical performance improves, but the convergence position of rays shifts
Solution Approach 1:
The patent controls the refractive index parameter to be within 1.45 to 1.65. This parameter range optimizes optical performance while ensuring that rays converge at the correct position (position B closer to the object than predetermined position A), maintaining the near-sightedness suppression function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively maintains the suppression of near-sightedness even after the coating film is applied, reducing stray light rays to 30% or less, ensuring clear vision by ensuring that rays converge at the intended positions.
Implementation Method 1
rays that have entered from the object-side surface are emitted from the eyeball-side surface and thus are focused on the wearer's retina (a predetermined position A in this specification). On the other hand, as for light that has passed through the minute convex portion, incident rays are focused at a position B closer to the object than the predetermined position A is.
Data Source
AI summary
Provided is an eyeglass lens 1 configured to cause rays that have entered from an object-side surface 3 to be emitted from an eyeball-side surface 4 and cause the emitted rays to converge at a predetermined position A. The eyeglass lens 1 includes a lens base material 2 having a plurality of base material convex portions 6 on at least one of the object-side surface 3 and the eyeball-side surface 4, and a coating film covering the surface provided with the base material convex portions 6, in which convex portions present on the outermost surface of the eyeglass lens 1 located on a side on which the base material convex portions 6 are provided and the base material convex portions 6 have common light ray convergence properties.