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ACAD (Achromatopsia Colour Assessment and Diagnosis)

Like CAD, this test measures red/green and yellow/blue chromatic sensitivity, but uses larger, spatially separated stimuli and eliminates the element of dynamic luminance contrast noise, making it accessible for low vision patients as well as for young children.

ACADWhat is unique about ACAD?

Many people who suffer from genetic eye diseases also have problems with their colour vision, but the severe loss of visual acuity these problems can cause often render the usual CAD test ineffective. City produced the ACAD, or Achromatopsia Colour Assessment and Diagnosis test to tackle this problem. Although other clinics use CAD tests, only City has this adapted version. It can be taken in place of the CAD test as part of the colour vision assessment.

Who can benefit from it?

Like CAD, this test measures red/green and yellow/blue chromatic sensitivity, but uses larger, spatially separated stimuli and eliminates the element of dynamic luminance contrast noise, making it accessible for low vision patients as well as for young children.

Other relevant tests

After taking these tests, you may be referred to take the PAPI or CRATO tests.

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City, University of London

Northampton Square

London EC1V 0HB

United Kingdom

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City, University of London is an independent member institution of the University of London. Established by Royal Charter in 1836, the University of London consists of 18 independent member institutions with outstanding global reputations and several prestigious central academic bodies and activities.