Lens

First, process Quartz into Processed Quartz at the Stonecutter's Table.

Craft a lens at a regular Workbench.

Titanium Bar

Smelt titanium ore in the regular Melting Furnace (Refined Melting Furnace is no longer required).

Glass

Melt sand using any fuel in the Melting Furnace.

Iodine

Can now be crafted from algae at the Medical Table.