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 :)