Color vision

           Although not directly affecting visual acuity, inability to see particular colours can be
a problem for the aircraft maintenance engineer.
Good colour vision for maintenance engineers is important for:
                    • Recognising components;
                    • Distinguishing between wires;ლ
                    • Using various diagnostic tools;
                   • Recognising various lights on the airfield (e.g. warning lights).
Colour defective vision is usually hereditary, although may also occur as a temporary condition after a serious illness.
Degrees of colour defective vision, some people suffering more than others. Individuals may be able to distinguish between red and green in a well-lit situation but not in low light conditions. Colour defective people typically see the colours they have problems with as shades of neutral grey.
Ageing also causes changes in colour vision. This is a result of progressive yellowing of the lens, resulting in a reduction in colour discrimination in the blue-yellow range.
Colour defective vision and its implications can be a complex area and care should be taken not to stop an engineer from performing certain tasks merely because he suffers from some degree of colour deficient vision. It may be that the type and degree of colour deficiency is not relevant in their particular job. 
 Absolutely accurate colour discrimination may be critical for a particular job, it is important that appropriate testing and screening be put in place.

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