Colour blindness
- Colour blindness also known as daltonism
→ Colour blindness is tested by Ishihara chart
→ Trichromats – All 3 cone types +
→ Dichromats – 2 cone types +
→Red colour-blind – Red cones not present
→Green colour-blind – Green cones not present
→ Blue colour blind – Blue cones not present
→Monochromats – 1 type of cones present
→ Most common colour blindness – Red green colour blindness [90%]