4. June 2020 - A letter from Dr. Achong (published by PANArt in Sept.)
A letter from Dr. Achong (PDF) (Engl.) / (German), published by PANArt on Facebook on 9/4/2020 as an expert opinion, states that every external shape is imaginable and that the lens shape is an aesthetic decision.
Letter is from 4.6.2020
Death of Dr.-Achong: 29.6.2020
Published by PANArt 4.9. 2020