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It is very unlikely that the reduced vision in your left eye ( or both eyes) is from a refractive error. I don't think the issue here is something that can be corrected by further lasik considering the fact that the vision in both eyes has been relatively fine for 15 years now. But there can be other causes for gradual progressive diminution of vision ( either one eye or both eyes) such as early cataract ( can cause double vision in one eye), chronic simple glaucoma, age related macular degeneration, diabetic retinopathy and so on.I believe that a thorough eye exam by an ophthalmologist will help to rule out all the possible causes and come to a conclusive diagnosis. Further treatment would be depend on the eye problem.
Please feel free to ask any other queries in the regard.
Thank you and best wishesIf you are satisfied with the answer , please press the accept button so that I get my dues.A bonus and positive feedback are welcome.Views expressed are for information purpose only and cannot substitute a visit to an ophthalmologist