Keep in mind its Soviet Technology developed under Soviet Doctrines. They didnt go out of their way to accommodate special human characteristics with a lot of their equipment.
Left handed ? learn to shoot right, poor eye sight ? no optic for you was probably the general mentality.
To make the POSP line up more appealing for those with eye complications BelOMO started offering models with the D distinction that would mean the optic has -3 to +3 diopter adjustment. This dial characteristic can clearly be scene on the optics body.
Crank all u want, but I hope others who read this hesitate to twist seals they probably shouldn't be.
Take some of what is said in this video with a grain of salt. The guy is incorrect on some critical bits of info like the fact he confuses the "lower" sitting optic for an AK version ( its not, its clearly a SVD version hence why its so low) AND calls the new taller one a PSL version (its actually just an AK version, but hey would u look at that coincidence a PSL is just a stretched out AK).