Eye health for closeup (e.g. computer) work:

  Ambient lighting matched to screen brightness, whether light or dark
  Dark ambience = dilated pupil = 0.5 diopter decrease in lens focus
  Reduce monitor blue light with F.lux, Apple Night Shift, etc
  Best light: unfiltered daylight, e.g. window behind computer screen
  Artificial: high CRI LED, low flicker, low blue (e.g. 2700K Sylvane Truwave) 

  20-20-20: look out window, or 20+ foot distant object for 20s every 20m
  Tear film over eyes helps focus: blink, yawn, hydrate & track humidity
  Increase eye-monitor distance: reduce eye convergence stress
  Closeup/computer glasses: PD & CR-39 focal length for lens-monitor distance

  Daily exposure to natural light, with distance focusing for eye muscles
  20mg lutein daily from food sources or supplement
  For presbyopia, daily convergence exercises