Merchant Navy Medical Requirements 2026: Eyesight Standards

Vision standards are one of the sharpest cutoffs in merchant navy entry - unlike a low exam score or a thin bank balance, a failed eyesight or color vision test at the medical stage usually cannot be fixed by trying harder next year. What confuses most first-time applicants is that “eyesight standards” isn’t one fixed bar: DG Shipping sets a genuinely different threshold for Deck and Engine departments, and understanding why saves candidates from ruling themselves out - or getting their hopes up - for the wrong reason.

Why Deck and Engine Are Held to Different Standards

A Deck officer’s job is built around visual judgement at a distance: reading another vessel’s navigation lights at night, distinguishing a red port light from a green starboard light while assessing risk of collision, reading signal flags, interpreting radar and ECDIS displays, and keeping a lookout in conditions where a half-second of misjudged color or distance matters. Because so much of collision avoidance still comes down to what the officer of the watch actually sees, DG Shipping holds Deck candidates to a stricter, largely uncorrected vision standard. Engine department work happens mostly in a machinery space, reading gauges, alarms, and instrumentation at close range under artificial light, so the medical standard here tolerates corrective glasses and a wider color vision range without compromising safety in the same way.

The Ishihara Test and What It Actually Screens For

Color vision is tested using Ishihara plates - the familiar dot patterns that hide numbers visible only to someone with normal color perception. This isn’t a formality; it specifically catches red-green color deficiency, the most common form of color blindness, which is exactly the pairing used in navigation lights and much of maritime signalling. A candidate who cannot reliably separate red from green fails this test regardless of how sharp their vision otherwise is, and for Deck department this is typically treated as disqualifying rather than something to retest around. Engine department applies a materially more lenient color vision requirement, since distinguishing colors on a control panel doesn’t carry the same collision-avoidance weight as reading a ship’s running lights at night.

Visual Acuity: What “Correctable” Actually Means

The other pillar is visual acuity - how sharp your vision is, measured against a standard eye chart. Deck department candidates are expected to meet a defined uncorrected standard, meaning the eye itself has to perform to the required level without glasses or lenses in place at the time of testing; near vision has its own separate benchmark. Engine department vision requirements are more forgiving of correction, allowing candidates to meet the standard with glasses or contact lenses up to a defined power limit. This is the detail that trips up a lot of aspirants who assume “I wear glasses but my corrected vision is fine” is good enough everywhere - for Deck, it generally isn’t, because the standard is written around what your eyes can do on their own.

LASIK and Refractive Surgery: Timing Matters More Than the Procedure

LASIK and similar refractive surgeries are a realistic option for candidates trying to meet the uncorrected acuity bar, but the surgery itself is only half the requirement. Most institutes and DG-approved examiners want to see a documented waiting period after the procedure - commonly several months - before they’ll certify the result, because early post-operative vision can still be fluctuating and hasn’t demonstrated the stability the standard is actually looking for. Turning up for a medical exam within weeks of surgery is a common and avoidable mistake; the sensible approach is to get the procedure done well ahead of your intended application cycle, get a written ophthalmologist assessment confirming stable, complication-free healing, and only then book the DG medical.

The Exam Itself Isn’t a Routine Checkup

One more detail candidates underestimate: this medical cannot be done by any general practitioner or family eye doctor. It has to be conducted by a DG Shipping-approved medical examiner or at an approved hospital, using the specific testing protocols the certificate requires. A vision report from an outside optician, however accurate, won’t be accepted in place of the official exam, and trying to shortcut this step just means redoing it later at an approved center. Given how much rides on this single test - and how limited the recourse is if you fail it for Deck - it’s worth getting an honest preliminary check with a qualified ophthalmologist before you commit financially to a course, rather than discovering an issue only after fees are paid.

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