What medical and eyesight standards are required to join the merchant navy?

<p>Merchant navy medical and eyesight standards require a valid seafarer medical certificate, such as the UK ENG1, plus distance vision and colour vision limits that are stricter for deck officers than for engineers.</p>Every seafarer must hold a valid medical fitness certificate issued after examination by a doctor approved by a maritime administration, because ships are remote workplaces where a medical emergency can be days from help and where an unfit crew member endangers everyone. The standards flow from the STCW convention and the Maritime Labour Convention, applied through national systems such as the ENG1 in the United Kingdom and equivalent certificates elsewhere. Most administrations recognise each other's certificates for service under their flags, but always check the specific requirements of the flag you intend to sail under.

The examination covers general health and the capacity to perform routine and emergency duties: heart, blood pressure and circulation, lungs, hearing, mobility and strength sufficient to climb ladders, handle equipment and wear breathing apparatus, and screening for conditions that could cause sudden incapacitation at sea, such as uncontrolled epilepsy, diabetes requiring assessment, or significant cardiac disease. Certificates are time-limited, typically valid for up to two years with shorter validity for young seafarers or restricted cases, and must be renewed throughout a career, so fitness is a continuing requirement, not a one-off gate.

Eyesight receives special attention and differs by department. Deck officers and lookouts must meet defined distance vision standards, with spectacles or lenses permitted within limits, and must pass a colour vision test, normally Ishihara plates, because identifying navigation lights and signal colours at night is fundamental to collision avoidance. A colour vision deficiency can close off the deck career entirely even when everything else is perfect. Engine department standards are less stringent on distance vision but still require adequate sight, including near vision for gauges and the ability to distinguish the colours used in cables and indicators. Hearing must be adequate for alarms and communications.

The practical advice that matters: take an approved seafarer medical, including the colour vision test, before you spend money on training or commit to a cadetship, because discovering a disqualifying condition after a year of study is a painful and avoidable outcome. Declare conditions honestly; concealment discovered later can void the certificate and your employment. If you are failed or restricted, most administrations provide a review or appeal route to a referee doctor, and some conditions permit limited or near-coastal certificates. Keep the certificate in date on board, since an expired medical invalidates your watchkeeping and can hold up the whole ship at a Port State Control inspection.