I am an optometrist in Colorado with severe RLS symptoms. This forum is an excellent method of sharing information on a complicated multifactorial enigma that desperately needs some solution to this pharmacologic mess. Maybe somebody can get more clues to give better relief without the nasty side effects. I have studied the algorithms currently available and get good advice from Dr. B.
I see several references to ocular side effects of Horizont/gabapentin/Lyrica drugs. Blurred vision is common. My research (and personal experience) reports that the underlying reason is loss of steady fixation on this class of drugs. The fine motor system is broken down and triggers nystagmus (eye tremor). It can also cause loss of binocularity and eye dryness causing redness. I could not find where it caused yellow eyes. This is more jaundice possibly from alcohol or liver problems. Other side effects of these drugs for me were loss of coordination, nausea, and mental fogginess. I did not get any significant help of RLS symptoms after a few short trials and one trial lasting a full year. Most of the side effects went away after two weeks on the longer trial.
I have had RLS symptoms for 40 years. Pramipexole worked very well for 20 years before I was advised about augmentation. Tapering off that drug was the most difficult thing of my life. Insomnia is a beast! I was off the dopamine agonist for two years before starting Neupro patch a few months ago. I did take low dose Synamet (Carbodopa/Levodopa} with some limited help. Methadone (15mg nightly) helps the intensity of symptoms but not some much the frequency. Unfortunately, Lyrica was not effective for me. I have tried iron infusions, diet control, other pain killers, pot, timely sex, Kratom, and 30 other suggested cures or triggers. None helped more than 10 percent except for dopamine drugs. Neupro 1mg patch is helping about 70-80% for now. Dr. B says the risks of further augmentation are possible but less than Pramipexole.
Hope this helps someone else out there. Maybe it is a "message in a bottle" to someone who can put the pieces together.