In my personal experience, I did not become a proficient sight reader until I first had spent a lot of time away from the instrument drilling rhythm patterns and variations, both clapping and singing, using a system (1 e & a*; there are others). Rhythm reading must become automatic.
While developing a solid rhythmic vocabulary I also wood-shedded scale and arpeggio reading (not rote) skills at very slow speeds (to check intonation of every note of every fingering variation) without regard to bowing or rhythm, then worked on a variety of bowings and articulations, like Sevcik or Reinschagen or Galamian, after I had the fingerings and intonation in control.
Then, the rhythmic, fingering, and bowing parts of the notation (as practiced seperately) became automatic and and I was (am) able to read and respond to the ever-changing musical information while sight reading (dynamics, articulations, bowings, repeats, key-signatures / meter changes, G.P.s, listen to and meshing with other instruments or sections, watch the conductor, listen to the solo instrument or soloist). Voila! Meta-consciousness!
Here is a rhythm book example from Alfred:
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I used a wickedly difficult Hindemith sight-reading, sight-singer book in college.