“Although it’s unusual, it is possible to become colour blind later in life through different diseases or eye conditions. These diseases can damage the optic nerve or the retina of the eye and lead to acquired colour blindness, also known as acquired colour vision deficiency” Also consideration should be made that perhaps the person has been on the verge of colour blindness over time and this is the year the threshold was crossed. WOuld be far better to have an ophthalmologist comment on this.