There is this strange rendering bug where block textures get blurry the further the blocks are from the player. This is most noticeable with the lava lakes in the Nether.
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This is most likely intentional, to mitigate performance loss; the lava texture you see outside a certain radius is most likely the first frame of the flowing lava flipbook. It would be wasteful for all those textures to animate from so far out as you wouldn't notice it as much.
Moreover, based on your screenshot, I don't really notice any blurriness per-se. Regardless, I'm pretty sure that this would also be caused by a performance improvement technique called mipmapping (without mipmapping, all textures far away would look extremely grainy).
Forward resolving as a duplicate of MCPE-173768, which includes more details.
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