There’s different degrees of visual defects that can arise depending on the lenses that are used and depending on the underlying display technology. Regular square pixels with have a screen door effect, even the highest resolution screens right now will still have this issue but it won’t be as apparent. Other display tech have other arrangements for the pixels other than square which also changes how the screen door effect can be perceived.
There are some displays that do beam the image directly to your retina but from what i’ve heard while the resolution is pretty good there’s still some shortcoming with the sharpness there as well. Instead of using a lens it uses really tiny mirrors to split and beam the light into your eye and it’s still relatively new tech.
