HOW TO REPLACE THE LENS
Delta uses interchangeable lenses. Please follow this simple steps.
Step 1 — Press on the front side of the frame where the nose pad resides and release the lens.
Step 2 — Hold the frame sideways with one hand and pull out the end of the lens with the other.
Step 3 — Remove the lens from the frame and proceed with its replacement, following the assembling procedure in reverse order.