l used to have great eyes, but I am pretty sure being on the computer a lot affected my eyesite. Now how can l improve it?

Being on the computer a lot wo not necessarily affect your sight, if you know how to use your eyes the right way.
And yes you can regain your perfect vision.
Make some researches about the bates method.

lots of antioxidants help! Trust me. Try lots of fruits, green tea, acai berry juice. There are also exercises to improve eye sight but l am not sure of its effectiveness.

get night contacts or glasses XD l wear night contacts and they r awesome