Contrast Check

“Colour is often used on computers to present information such as the London Underground map available on the internet, which relies on colour to distinguish between different lines.  With colour being an important component, significant visual information often disappears when colour images and documents are viewed by those who may have colour vision deficiencies (colour blind). Although no specialist hardware or software is required for users with Colour Vision Deficiency or colour blindness, such as adapted input devices or screen readers, consideration needs to be made for colours of font, background themes, and buttons as examples. This is especially true for buttons which when hovered over change colour, or text when it is highlighted. Bright colours are less confusing then similar shades of a colour, with black and white being clearly different. Living with Colour Vision Deficiency

Contrast differences between text sizes and shapes are also important for readability and bizarre ‘word art’ type fonts may be distracting. This is discussed further under Text size and style, blinking elements