1. Ahead of means closer to a destination than or in front of.
My friend arrived first, and was ahead of me in line.
2. Ahead of means before.
You are in a hurry; please go ahead of me.
3. Ahead of can mean more advanced than.
Because he was absent for two weeks, the other students in his class are ahead of him.
4. Phrasal verbs
get ahead (intransitive)—succeed
She has struggled all her life to get ahead.
get ahead of (nonseparable)—advance faster or further than someone else
They are rivals, always competing to get ahead of each other.
go ahead (intransitive)—Do it; begin now
I asked for permission, and they told me to go ahead.
Eye care tips for Computer users
Add zinc to your diet
Zinc aids in the production on melanin, a pigment which helps protect the eyes. There are a number of foods that will add a good amount of zinc into your diet.
Shellfish. Lobster, crab, and oysters all provide high doses of zinc.
Spinach and other green leafy vegetables. In addition to vitamin C, these vegetables will give your body the zinc it needs to protect your eyes.
Nuts. Cashews, peanuts, almonds, and walnuts are all high in zinc. They are easy to snack on throughout the day.