It is advisable to avoid undergoing the LASIK eye surgery procedure for patients on systemic medicines, preventing the complete recovery of the cornea. Other reasons for not performing laser eye operations on patients are systemic conditions. These are the diseases like diabetes or conditions wherein the collagen level in the body is not normal, for example, the Marfan syndrome. Also, if a patient cannot stare at a fixed object for a minimum of 60 seconds, the patient may not be a great candidate for LASIK eye surgery.