subject: Your Lasik Fears Answered [print this page] Lastly, if you have a fear of an object coming towards your eyeball, such as the doctor's hand, have no worries, your doctor will apply "black out drops" to your eyes that will, as the name implies, black out your vision for a period of 10-20 seconds. Believe it or not, this short period of time is more than enough time to complete the laser treatment.