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Sorry for your difficulty with the double vision. If the double vision has not significantly resolved with added prisms, vitrectomy
and cataract surgery, it is possible to improve your vision with orthoptic eye exercises including pencil push-up for strengthening eye muscle, convergence and/or acommodation. It is also possible that shape of the eye ball since vitrectomy and cataract surgery has progressively changed that rechecking of the glasses refraction
is necessary for possible new adjustment of the prism strength (either down or up). It is also possible that the lens
implant place in the eye(s) after cataract surgery developed scar tissue (film or opacity) that introduces distortion or scattering of eye incoming light, and preventing significant resolution of the double vision. In general, such lens implant scar tissue or film can be resolved with yag laser treatment by the eye doctor. In the meantime, I suggest that request that your eye doctor to demonstrate or teach you some orthoptic eye exercises. One of the exercises involves holding a pencil at arms length with the pencil tip at the level of the tip of the nose in front of you. Then, slowly move the pencil closer to the nose while focusing at the tip of the pencil with both eye (with or without the glasses on) until you begin to see double image of the tip of the pencil. At that point you return to the arm stretch position and repeat that process again. You should perform this eye muscle strengthening exercise up ten times at each routine, 2-3 times daily. In addition, you use preservative free tear drop such as Refresh plus or Genteal tears 2-4 times daily to prevent dry cornea and allow better cornea refractive index, especially as a good amount of light bending which affects image focusing as it enters the eye takes place at the tearfilm/cornea interface.
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Please note that this answer is for information only. It cannot be substituted for the visit to or the recommendation of your doctor.