Well, yes, it is possible for your eyes to change color when you cry, for your eyes color can change with emotions. Generally speaking, when you are sad, concerned, worried, and have cried, the color of your eyes will become Light grey and light blue. And you should know that color change in your eyes is caused by blood pressure. So when you are clam, your eyes' color can change to grey. And in embarrassed or excited situation, your blood goes faster through the veins. And then when you calm down, the blood then goes slower. So it can make your face red and also, your eyes change color. Anyway, it's very normal to have this situation. And you should not be too worried about it. If you do not make your eyes change color frequently, you may go and see a doctor.