You mention the word "twinkle", that remind me the song "twinkle twinkle little star, how I wonder what you are!" It is really interesting. There has two ways to brighten or sparkle your eyes, one is to wearing colorful contacts, the effects will be immediately; The other is to protect your eyes, relax it and give supplement to it in a long run, then your eyes will be sparkle and charming. The second method has no side-effect to your eyes and body health, but it will cost a long time. Some supplement or fruits which full of Vitamin A & B, and carotene. They are the necessary nutrients which would protect your eyes everyday. Looking far distance after your work is necessary for you to protect your eyes. Use your eyes to searching birds and golden fish is a way to practice the eyes' ability of movements. You would choose the one suit for you.