No, you don’t need a new eyeglass correction. This appears to be the 1928 Luxembourg-Casemates view postal stationery card apparently without stamp imprint used to Germany on June 6, 1932, with 35c adhesive franking.
When I acquired this item, the previous owner had penciled “rare” on the front. Is it? I don’t think so, but it certainly is unusual.
In fact, the sender has cleverly uprated the normal 40c stationery card (with stamp imprint) by placing a 35c Charlotte definitive precisely over the 40c stamp imprint, thus paying the 75c postal card rate to Germany.
Below is an example of the 40c card with stamp imprint visible:
Beware of proclaimed “rarities” that make no logical (or philatelic) sense!