The Ishihara test is related with

Correct answer: (c) Colour blindness

Explanation

The Ishihara test uses plates of coloured dots to diagnose colour blindness, mainly red-green deficiency.

Numbers or patterns in the plates are visible only to people with normal colour vision.

Bone density uses a DEXA scan, IQ uses intelligence tests, and haemoglobin is checked by blood tests – not the Ishihara test.