you have what is known as computer vision syndrome
. It is due to prolonged working on computers.
you should take break on ur seat itself every half hour by looking at distance, n blinking frequently.
the doc has given the correct prescription n advice. Do follow it.
healthy diet is beneficial not only the eyes but the whole body, so continue it.
when the white portion enters the black portion of the eyes it is known as pterygium
. It is harmless unless progressing--- then see specialist.it occurs in those who are outdoors in sunny , windy climate as in goa