I am a woman in my 50's who began wearing monovision contacts about 9\nyears ago. I began experiencing occasional episodes of horizontal\ndiplopia during my 4th year of monovision under specific circumstances\n(mostly night driving and watching movies in a theater). The\nophthalmologist I consulted dismissed my concerns, telling me that he\nexperienced double vision himself when he wasn't feeling well. So I\ncontinued using monovision, although the episodes of diplopia increased\nin frequency during each of the next five years. I decided to stop\nusing monovision this spring (against the advise of my optometrist),\nand that's when my real vision problems began! The episodes of diplopia\noccurred throughout the day (distance vision only), impairing my\nability to function. After a couple of useless consultations with eye\ncare professionals, I found an optometrist who diagnosed strabismus and\nprescribed prism glasses (OS 3BO OD 3BO). The prisms (which are quite\nheavy) eliminate almost all of the diplopia, but my depth perception is\nstill impaired. The optometrist also suggested vision therapy, but he\ndid not appear to be too optimistic about the probability of successful\nresults. So I am now considering strabismus surgery. Despite my\nresearch, I cannot find a single study about treating someone with my\nhistory. In case it is relevant, I did not have strabismus as a child\nand have no family history of the disorder. My glasses prescription is\nOD-5.50-1.50x175 OS-6.00-1.00x175 ADD +2.00. Any\ninformation/suggestions for treatment would be greatly appreciated!