Contact lens for treating color vision deficiency and method of manufacturing same
AssigneeKhalifa University of Science and Technology
InventorsHaider Butt, Mohamed Elsherif
Life of this patent
Estimating the term…
Abstract
An ophthalmic contact lens configured to treat color vision deficiency is presented herein. The contact lens includes a tinted region containing either or both of a first dye that is configured to absorb at least 50% of incident light in a spectral band between 480 nanometers to 500 nanometers and a second dye that is configured to absorb at least 50% of incident light in a spectral band between 550 nanometers to 580 nanometers. A method of manufacturing such a contact lens and a process of forming an ophthalmic contact lens by an additive manufacturing process is also presented.
Claims19
An ophthalmic contact lens, comprising:
- a tinted region containing at least one selected from a list consisting of a first carboxytetramethylrhodamine dye having a concentration in the range of 0.000015% to 0.00003% by weight and configured to absorb at least 50% of incident light in a spectral band between 480 nanometers to 500 nanometers and a second carboxytetramethyl-rhodamine dye having a concentration in the range of in the range of 0.000015% to 0.00003% by weight and configured to absorb at least 50% of incident light in a spectral band between 550 nanometers to 580 nanometers.
A method of forming an ophthalmic contact lens, comprising:
- providing a solution comprising polyethylene glycol dimethacrylate, 2-hydroxyethyl methacrylate (HEMA), and 2,2-dimethoxy-2-phenylacetophenone;
- forming a first mixture of the solution and a first carboxytetramethylrhodamine dye having a concentration in the range of 0.000015% to 0.00003% by weight configured to absorb at least 50% of incident light in a spectral band selected from a list consisting of 550 nanometers to 580 nanometers and 550 nanometers to 580 nanometers;
- pouring the first mixture into a mold;
- and
- curing the first mixture by exposure to ultraviolet light.
A process of forming an ophthalmic contact lens, comprising:
- providing a first liquid resin solution;
- forming the contact lens from the first liquid resin solution using a 3D printing process and curing the first liquid resin solution by exposure to ultraviolet light;
- dipping the contact lens formed by the 3D printing process into a second liquid resin solution;
- adding a first carboxytetramethylrhodamine dye having a concentration in the range of in the range of 0.000015% to 0.00003% by weight configured to absorb at least 50% of incident light in a spectral band between 480 nanometers to 500 nanometers or a second carboxytetramethylrhodamine dye having a concentration in the range of in the range of 0.000015% to 0.00003% by weight configured to absorb at least 50% of incident light in a spectral band between 550 nanometers to 580 nanometers to the first or second liquid resin;
- and
- curing the second liquid resin solution by exposure to ultraviolet light.
Dependencies are inferred from the claim text.