It is very important to accurately measure the size of a patients pupils, especially at night when they naturally dilate and become larger.
Just because you have large pupils doesn't necessarily mean you will not be suitable for laser eye correction.
At your consultation, which is performed by the doctor, he will examine your eyes thoroughly and take some very detail measurements and will be able to discuss this with you.
All eye surgical procedures carry a level of risk including not obtaining the desired outcome, through to varying levels of visual loss. Your eye surgeon will discuss the risks and benefits, including ones specific to your circumstances, at the time of your pre-operative consultation.