The eyesight requirement for engine cadet in merchant navy is

6/12 in both eyes

Or 6/9 in one and 6/18 in the other eye

Merchant navy is one of the best profession for people with a zeal to travel around the world and apart from the sense of adventure the officers also get a handsome salary for themselves .

Some of the best private colleges in marine engineering are

1.tolani maritime institute

2.AMET

There are various shipping companies like maserk who recruit cadets from these colleges .

All the best :)