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Guide

Eyesight and colour vision. The requirements at sea and offshore.

Are you colour blind, or do you wear glasses or lenses, and need a seafarer medical or an offshore certificate? Here are the eyesight standards set by the Danish Maritime Authority, the ILO and IMO, and the Norwegian health requirements.

The short answer

For seafarers on Danish ships, the eyesight standards are in annex 1 to the Danish Maritime Authority's order on medical examination of seafarers and fishers (BEK no. 1463 of 2023). The figures are the same as in STCW Code table A-I/9. The standard depends on your duties on board: deck and lookout have the strictest standard, engine and radio slightly less strict.

On the Norwegian shelf, visual acuity must be at least 0.1 without glasses or lenses, with a normal visual field in at least one eye. The Norwegian health requirements regulation does not mention colour vision in its eyesight requirements.

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Seafarer medical certificate (STCW) DKK 1,035. Norwegian Health Certificate DKK 1,580. Prices incl. VAT.

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Eyesight standards for seafarers

Values are in Snellen decimal notation, the figure that tells how much of the eye chart you can read. 1.0 is normal vision.

Duties on boardDistance vision, correctedUncorrectedColour vision (CIE)
Masters, deck officers and ratings on lookout0.5 in the better eye and 0.5 in the other0.1Standard 1 or 2
Engineer officers, electro-technical officers and engine-room watch ratings0.4 in each eye, both eyes together at least 0.40.1Standard 1, 2 or 3
GMDSS radio operators0.4 in each eye0.1Standard 1, 2 or 3

For deck and lookout, a value of at least 0.7 in one eye is recommended to reduce the risk of undetected eye disease. There are also standards for visual fields, night vision and double vision, and deck requires normal visual fields.

Colour vision and colour blindness

The colour vision standard follows the International Commission on Illumination's recommendation for transport (CIE-143). The ILO and IMO guidelines on the medical examinations of seafarers describe how it is tested:

The standard differs for deck and engine, see the table. Whether your colour vision meets standard 1, 2 or 3 is decided at the examination. According to the ILO and IMO guidelines, the part of an STCW medical certificate that relates to colour vision can remain in force for up to 6 years.

Glasses, lenses and laser surgery

If you do not meet the standard

The Danish Maritime Authority can deviate from the eyesight standards in annex 1 based on a statement from an eye specialist who has assessed your vision, and can then issue a new medical certificate (BEK section 11(3)). The seafarer doctor can also issue a certificate with limitations, for example on duties. If you disagree with the result, you can appeal to the Danish Maritime Appeals Board. Read more in the guide if you are found unfit.

Norwegian shelf

The Norwegian health requirements regulation (section 11) requires visual acuity good enough to work safely on an installation, and a normal visual field in at least one eye. The County Governor of Rogaland states that visual acuity must be at least 0.1 without glasses or lenses. That is not your glasses prescription, but the figure for how much of the eye chart you can see. If you wear contact lenses around the clock, the uncorrected requirement does not apply.

A British OEUK certificate is also accepted for work on the Norwegian shelf, according to the County Governor. Read more in the guide Norwegian health certificate: medical conditions.

Book an examination

Prices include VAT and are also on the price list. The clinic is at Smørpøtvej 9, Esbjerg Ø.

Seafarer medical certificate (STCW)

DKK 1,035

Eyesight, colour vision and hearing to the Danish Maritime Authority annexes.

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Eyesight and hearing test for leisure sailors

DKK 625

For the Danish yachtmaster licence (3rd grade). About 15 min.

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Norwegian health certificate

DKK 1,580

For the Norwegian shelf, to the Norwegian health requirements.

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Sources: Danish Maritime Authority, BEK no. 1463 of 5 December 2023, sections 11 and 30 and annex 1, ILO and IMO, Guidelines on the medical examinations of seafarers, section on validity and appendix A, Norwegian regulation on health requirements for persons working on petroleum installations offshore, section 11 and County Governor of Rogaland, Helseerklæring offshore. Read September 2026. This page is practical guidance and does not replace the doctor's assessment on the day.

Frequently asked questions

Can I become a seafarer if I am colour blind?

It depends on the degree and on your duties on board. Deck and lookout require CIE standard 1 or 2, while engine and GMDSS radio require standard 1, 2 or 3. Whether you meet the standard is decided at the examination.

What eyesight is required for a deck rating?

At least 0.5 in each eye with glasses or lenses and at least 0.1 without. At least 0.7 in one eye is also recommended.

Can I use colour-correcting lenses for the colour vision test?

No. According to the ILO and IMO guidelines, colour-correcting lenses invalidate the test result and must not be used.

Does the Norwegian health certificate require colour vision?

The Norwegian health requirements regulation, section 11, sets requirements for visual acuity and visual field, but does not mention colour vision.

What if I do not meet the eyesight standard?

The Danish Maritime Authority can deviate from the standard based on a statement from an eye specialist, and the seafarer doctor can issue a certificate with limitations.

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Dr Helle Wibe

Offshore Medicals is run by Dr Helle Wibe

Seafarer and petroleum doctor with more than 20,000 medical examinations. OEUK-approved since 2006 and approved in Denmark, Norway, the UK and Sweden.

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