Eye Health Facts
What is colour blindness?
The eye determines the colour of what we are looking at by how much response comes from each of three types of light receptors (red, green, or blue). The most common type of colour vision deficiency is where one type of light receptor, usually red or green, doesn't work as well.
This reduces the range and appearance of colours, with some colours that are clearly different to normal eyes appearing the same to a colour deficient people. What do they see? one demo, another.
True colour blindness - black and white only - is very rare. Colour vision deficiencies are usually inherited, and are more common in boys than girls.
Eye Health Facts
What is welding flash?
The bright light generated by some welding equipment is very high in UV content. And, just as too much UV outdoors can cause sunburn, so the UV light from welders can cause sunburn-like damage to the clear skin layer covering the front of the eye. Sometimes straight away but often a few hours after the welding flash, the damaged cells die and fall off, exposing the very sensitive, nerve-rich layers below. The pain and discomfort is such that most people make sure they never get welding flash a second time.
A similar effect can happen by spending a bright sunny day at the snow without sunglasses.