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Due to your corneal thickness and high astigmatism you may not be eligible for regular LASIK. However, as with most high prescriptions you should go into a consultation, do all the necessary exams and be evaluated by a board certified refractive surgeon.
Your question about corneal thickness is a good one. Adequate corneal thickness is necessary to be a good candidate for Lasik. It is important to realize it is not the only criteria. In addition to stability, and adequate corneal thickness, good candidates also need to have healthy eyes and a normal corneal shape. There are other technical criteria that can only be obtained via examination. Being a good Lasik candidate is best determined by obtaining a consultation with an experienced Lasik surgeon.
Other factors are also important, such as the pattern of your corneal curvature. The numbers you have provided are appropriate for Lasik.
It depends on your vision in the eye. Some people are able to see 20/20 even with -0.50 myopia in that eye. With additional surgery there's always a risk, if you're already seeing well out of that eye I may recommend leaving it like that since the myopia will actually help you with reading once...
Stability is an important thing to establish prior to doing refractive surgery. This depends on a number of factors including your age, your refraction, and other associated findings. For the FDA trials, a change of less than 0.50 diopters over the course of a year was considered...
You should use preservative free tears every hour for a month after any type of refractive surgery as this helps the healing and visual recoverypreop and months postop you can get away with preserved tears as they are cheaper and you won't be using them so often