Color blindness

Color blindness, also known as color vision deficiency or Daltonism, refers to the difficulty in distinguishing red, green, blue, or mixtures of these colors. Complete loss of color vision is very rare. Color blindness can be classified into congenital color blindness and acquired color blindness based on its etiology. Congenital color blindness is related to genetic factors, usually presenting as color vision deficiency from birth, without other obvious ophthalmic or systemic diseases. Acquired color blindness is generally caused by certain eye diseases, possibly due to damage to the optic nerve or retina caused by certain medications or lesions. In addition to color vision deficiency, it is often accompanied by decreased visual acuity.