Food
Colorblindness causes difficulty with the connotative color tasks associated with selecting or preparing food, for example:

Selecting food for ripeness can be difficult. The green-yellow transition of bananas is particularly hard to identify. Detecting bruises, mold or rot on some foods
Determining when meat is done by color
Distinguishing some varietals, such as a Braeburn from a Granny Smith apple
Distinguishing colors associated with artificial flavors (e.g. jelly beans, sports drinks)

Skin color
Changes in skin color due to bruising, sunburn, rashes or even blushing are easily missed by those with red-green colorblindness. These discolorations are often linked to the blood oxygen saturation, which affects skin reflectance. Traffic lights
The colors of traffic lights can be difficult for the red-green colorblind. This includes distinguishing:

red/amber lights from sodium street lamps;
green lights (closer to cyan) from normal white lights. Red from amber lights, especially when there are no positional clues available (see image).The main coping mechanism to overcome these challenges is to memorize the position of lights. The order of the common triplet traffic light is standardized as red-amber-green from top to bottom or left to right. Cases that deviate from this standard are rare. One such case is a traffic light in Tipperary Hill in Syracuse, New York, which is upside-down (green-amber-red top to bottom) due to the sentiments of its Irish American community. However, it has been criticized due to the potential hazard it poses for color-blind drivers. Signal lights
Navigation lights in marine and aviation settings employ red and green lights to signal the relative position of other ships or aircraft.
In some cases, an affected person inherits a mutation in the GLI3 gene from one affected parent. Other cases result from new mutations in the gene and occur in people with no history of the disorder in their family. Diagnosis
Treatment
Notable Cases
George William Helon (Australian author and businessman) is a Pallister-Hall Syndrome (PHS) patient, mentor, counsellor and advocate. References
Pallister–Hall syndrome at NLM Genetics Home Reference

External links

GeneReviews/NCBI/NIH/UW entry on Pallister–Hall Syndrome
Genetics Home Reference