Multiple-wavelength lens forming system and method

Patent metadata

Field	Value
Publication number	US-11029534-B2
Application number	US-201816154632-A
Country	US
Kind code	B2
Filing date	Oct 8, 2018
Priority date	Oct 8, 2018
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

An apparatus and method for forming a contact lens includes submerging a convex optical quality surface of a forming optic in a reservoir containing Lens Reactive Mixture, projecting a first Actinic Radiation with a first wavelength through pre-selected regions of the forming optic that correspond to increased thickness in the lens to be formed for selectively polymerize the Lens Reactive Mixture on a Voxel by Voxel basis; projecting a second Actinic Radiation with a different wavelength through the entire forming optic to selectively polymerize the Lens Reactive Mixture on a Voxel by Voxel basis, removing the forming optic and polymerized Lens Reactive Mixture from the reservoir and applying a Fixing Radiation to form the contact lens.

First claim

What is claimed is:

1. A method for forming a contact lens having an optic zone comprising:
forming a Lens Precursor by
obtaining a Lens Reactive Mixture including a UV blocker and a photoinitiator;
submerging a convex optical quality surface of a forming optic in a reservoir containing said Lens Reactive Mixture;
projecting a first Actinic Radiation having a first spectrum of wavelengths through pre-selected regions of said forming optic, wherein the first spectrum of wavelengths is not attenuated by said UV blocker and is within an initiator absorbance range of said photoinitiator; wherein said pre-selected regions correspond to locations of said contact lens to be formed having a thickness greater than a pre-determined thickness and that are not located in the optic zone, and wherein said first Actinic Radiation is selectively controlled to selectively polymerize or partially polymerize said Lens Reactive Mixture on a Voxel by Voxel basis at said pre-selected regions; and
projecting a second Actinic Radiation having a second different spectrum of wavelengths through said forming optic over a second region corresponding to an entirety of said contact lens to be formed, wherein said second spectrum of wavelengths is at least partially attenuated by said UV blocker and is within said initiator absorbance range of said photoinitiator, wherein said second Actinic Radiation is selectively controlled to selectively polymerize or partially polymerize said Lens Reactive Mixture on a Voxel by Voxel basis across said forming optic;
wherein a time required to form said Lens Precursor is less than a time required to form said Lens Precursor using only said second Actinic Radiation;

removing said forming optic and formed Lens Precursor from said Lens Reactive Mixture;
applying a Fixing Radiation to form said contact lens.

2. The method according to claim 1 , wherein said projection of said first Actinic Radiation is ceased before transmitting said second Actinic Radiation.

3. The method according to claim 1 , wherein said projection of said first Actinic Radiation continues in conjunction with transmission of said second Actinic Radiation.

4. The method according to claim 1 , wherein said first Actinic Radiation is centered around a 420 nm wavelength light and said second Actinic Radiation is centered around a 365 nm wavelength light.

5. The method according to claim 1 , wherein said first Actinic Radiation is centered around a 385 nm wavelength light and said second Actinic Radiation is centered around a 365 nm wavelength light.

6. The method according to claim 1 , wherein said pre-determined thickness is 350 microns.

Assignees

• Johnson & Johnson Vision Care

Inventors

• Powell Paul Mark
• Sites Peter W
• Wood Joe M
• Widman Michael F

Classifications

• G02C7/04 Primary

  Contact lenses for the eyes (disinfection or sterilisation of contact lenses A61L12/00) · CPC title

• B29D11/00153 Primary

  Differential curing, e.g. by differential radiation · CPC title

• B29D11/00144

  wherein the lens material is not fully polymerized, e.g. by leaving an unpolymerized volume · CPC title

• B29C2037/90

  Measuring, controlling or regulating · CPC title

• B29C2035/085

  using gamma-ray · CPC title