Vision test
CAD Colour Vision Test
Detailed Colour Assessment and Diagnosis (CAD) test โ a fallback when Ishihara plates flag a possible colour vision deficiency.
Duration
15 min
Category
Vision
From
ยฃ20
Included in
5 medicals
What It Involves
A computer-based Colour Assessment and Diagnosis (CAD) test that maps your colour vision more precisely than Ishihara plates alone. Maritime (ENG1) and some aviation medicals accept a passed CAD result as a fallback when plate tests suggest a deficiency โ it is not a treatment, just a more detailed assessment.
What to Bring
Valid photo ID (passport or driving licence) (and 3 more items)
Frequently Asked Questions
When Ishihara plates suggest a colour vision deficiency but your role (especially maritime ENG1) allows a more detailed CAD assessment as a fallback โ not every sector accepts it.
No โ colour vision is permanent. Just attend with your normal vision correction and allow 15โ20 minutes for the computer-based assessment.
Health questionnaire
If your clinic requires a pre-visit health form, we'll email you their link. You complete it directly with the clinic โ we never see or store your answers.