Cllr, as an optometrist, I suspect what you are referring to is what is called corneal neovascularization. Contact lenses can indeed cause this invasion of blood vessels into the normally clear front surface of the eyeball. Scar tissue can develop from the blood vessels, causing the cornea to become opaque, and loss of vision can result. Often, this is seen when people misuse their contacts, like leaving them on all day and night for weeks or months at a time, not cleaning them regularly, or overextending the useful life of disposable contacts. If this type of vision loss does occur, a corneal transplant can restore useful vision. Much better to avoid it though, and if your condition was showing signs of worsening, I would suggest no further use of contacts. Incidentally, choroidal neovascularization, which causes macular degeneration, happens at the level of the retina, at the back of the eye, and has nothing to do with corneal neovascularization. Also, Lasik and other refractive procedures are an option, but not all patients do well. Sometimes doctors who do a lot of lasik get into sales pitch mode. Get a second opinion before going that route. Glasses are your safest option, if you can tolerate them. Good luck, Al