Textures look blurry when looking from a distance with Three.js

In my game that uses Three.js, my textures look blurry when I go further away from them. Due to the nature of my 16-bit retro style, I must not have anything blurry.

Any idea what I could do to solve this? I create my textures like this:

var texture  = new THREE.Texture( image,
  new THREE.UVMapping(),
  THREE.RepeatWrapping,
  THREE.RepeatWrapping,
  THREE.NearestFilter,
  THREE.LinearMipMapLinearFilter );

If I select NearestFilter for both, the result looks rather ugly and too sharp: