# US 5,351,100 A · Glass multifocal ophthalmic lens with polarizing element and method of making

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- Number: US 5,351,100 A
- Document ID: US5351100A
- Status: Granted
- Kind: A
- Application number: 07/987,737
- Filed: 1992-12-09
- Granted: 1994-09-27
- Earliest claimed: 1992-12-09
- Assignees: BMC Industries, Inc.
- Inventors: Ray D. Schwenzfeier; Donald W. Hanson
- Web page: https://patentgrep.com/patent/US5351100A

## CPC

- G02C 7/06: bifocal; multifocal {; progressive (G02C7/041 takes precedence)}
- G02C 7/12: Polarisers
- G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00)

## Abstract

The present invention includes a glass multifocal light polarizing ophthalmic lens having a glass multifocal lens portion with a multifocal element fused to a convex outer surface of the multifocal lens portion, a single vision lens portion opposing the multifocal lens portion and a polarizing film sandwiched between the multifocal lens portion and the single vision lens portion. The present invention also includes a method for making the glass multifocal light polarizing ophthalmic lens.

## Claims

### Claim 1

A multifocal glass light polarizing ophthalmic lens comprising:
a glass multifocal lens portion having a convex outer surface, a concave inner surface and a multifocal element fused to the convex outer surface;
a glass single vision lens portion having a convex inner surface and a concave outer surface; and
a light polarizing film having a convex surface that adheres the concave inner surface of the glass multifocal lens portion and having a concave surface that adheres the convex inner surface of the glass single vision lens portion.

### Claim 2 (depends on 1)

The glass ophthalmic lens of claim 1 wherein the single vision lens portion has a minimum center thickness of about 0.2 millimeters after completion of grinding and polishing to a patient's prescription.

### Claim 3 (depends on 1)

The glass ophthalmic lens of claim 1 having a multifocal element with a diameter of about 28 millimeters and having a minimum center thickness of not more than about 2.7 millimeters at an add power of 3.00 diopters.

### Claim 4 (depends on 1)

The glass ophthalmic lens of claim 1 having a multifocal element with a diameter of about 25 millimeters and having a minimum center thickness of not more than about 2.2 millimeters at an add power of 3.00 diopters.

### Claim 5

A method for making a glass multifocal light polarizing lens comprising:
providing a glass multifocal lens portion having a convex outer surface and a concave inner surface and having a multifocal element fused to the convex outer surface;
providing a glass single vision lens portion having a convex inner surface and a concave outer surface;
providing a light polarizing film that is sandwiched between the glass multifocal lens portion and the glass single vision lens portion;
applying an adhesive to the concave surface of the multifocal lens portion; contacting the polarizing film to the adhesive;
applying an adhesive to an exposed surface of the polarizing film;
contacting the convex surface of the single vision lens portion to the adhesive;
curing the lens; and
finishing the concave outer surface of the single vision lens portion in accordance with a wearer's prescription.

### Claim 6 (depends on 4)

The method of claim 4 wherein the lens is cured by exposure to ultraviolet light.

### Claim 7 (depends on 5)

The method of claim 5 wherein the single vision lens portion has a minimum center thickness of about 0.2 millimeters upon completion of grinding and polishing to a patient's prescription.