Method for selectively treating surfaces

1. A method of treating a surface comprising:

providing an object having at least one planar face;

applying a masking layer to a target surface area of the object, wherein the target surface area includes at least a portion of the planar face, and wherein applying the masking layer to the target surface area is a dry process;

applying a sacrificial material to a non-target surface area of the object while the masking layer is still applied to the target surface area of the object;

removing the masking layer from the target surface area;

exposing the target surface area to a substance that etches the target surface area of the object; and

removing the sacrificial material from the non-target surface area of the object and leaving the target surface area of the object etched by the substance while the non-target surface area is not etched by the substance, wherein the object includes an optical eyepiece to be coupled to a head mounted display (“HMD”) and the masking layer includes an adhesive film for bonding to the target surface area.

2. The method of claim 1 further comprising:

curing the sacrificial material after applying the sacrificial material to the non-target surface area.

3. The method of claim 2 , wherein curing the sacrificial material includes exposing the sacrificial material to ultra-violet (“UV”) light.

4. The method of claim 1 further comprising:

trimming a portion of the sacrificial material from the object.

5. The method of claim 1 , wherein the sacrificial material is solvent soluble.

6. The method of claim 1 , wherein removing the sacrificial material includes etching the sacrificial material.

7. The method of claim 1 , wherein the object is a cubic part having six surfaces and the target surface area is a first surface of the six surfaces.

8. A method comprising:

providing a plurality of optical parts, wherein each optical part in the plurality of optical parts includes a planar face and includes an optical eyepiece to be coupled to a head mounted display (“HMD”);

applying an adhesive to the planar face of each of the optical parts in the plurality of optical parts, wherein a target surface area of each of the plurality of optical parts is the planar face;

applying a sacrificial material to a non-target surface area of each of the plurality of optical parts;

removing the adhesive from the target surface area of each of the plurality of optical parts;

coating the target surface area of each of the plurality of optical parts; and

removing the sacrificial material from the non-target surface area of the plurality of optical parts.

9. The method of claim 8 , wherein the adhesive includes a double-sided adhesive that is laminated to a rigid substrate.

10. The method of claim 8 , wherein the adhesive includes an ultra-violet (“UV”) release tape.

11. The method of claim 8 , wherein coating the target surface area of each of the plurality of optical parts includes utilizing chemical vapor deposition.

12. The method of claim 8 , wherein coating the target surface area of each of the plurality of optical parts includes coating the target surface area with a photochromic coating.

13. A method of treating a surface comprising:

providing an optical part having at least one planar face, wherein the optical part is for including in a head mounted display (“HMD”);

applying a masking layer to a target surface area of the optical part, wherein the target surface area includes at least a portion of the planar face, and wherein applying the masking layer to the target surface area is a dry process;

applying a sacrificial material to a non-target surface area of the optical part while the masking layer is still applied to the target surface area of the optical part;

removing the masking layer from the target surface area;

exposing the target surface area to a substance that etches or coats the target surface area of the optical part; and

removing the sacrificial material from the non-target surface area of the optical part and leaving the target surface area of the optical part etched or coated by the substance while the non-target surface area is not etched or coated by the substance.