Goggles shall be designated according to types, as follows:

1. (1) Type 1. Goggles with rigid nonadjustable bridge (or adjustable metallic bridge) without side shields.
2. (2) Type 2. Goggles with rigid nonadjustable bridge (or adjustable metallic bridge) with side shields.
3. (3) Type 3. Goggles with flexibly connecting lens containers shaped to conform to the face.
4. (4) Type 4. Goggles with or without side shields with lens of a diameter of not less than 1 3/4 inches. The goggles of type 4 need not conform to either the drop test or to the test for frames and shall be used only for light grinding and for work around furnaces.