"Protan" is a term commonly used in the field of color vision deficiency. The correct spelling of the term is pronounced as /proʊtæn/ (pro-tan), which is represented in the International Phonetic Alphabet (IPA) as /p r oʊ t æ n/. The word is typically used to describe a type of color blindness where the individual has difficulty distinguishing between red and green colors. The spelling of the word is important to ensure proper communication and understanding among individuals within the field.
Protan is a term often used in the field of color vision to describe individuals with a specific type of color blindness known as protanomaly. This condition is characterized by a reduced sensitivity to red light and a difficulty in distinguishing between different shades of red, orange, and yellow. Protan individuals have a deficiency in the function or number of red-sensitive cone cells in their eyes.
The word protan originated from the Greek words "pro", meaning "before" or "forward", and "anthos", meaning "flower". It was coined to describe the decreased sensitivity to red light experienced by protanomaly individuals compared to those with normal color vision.
The term protan is also commonly used to refer to a person who has protanomaly or exhibits the characteristics associated with this condition. These individuals may struggle with color-related tasks such as identifying ripe fruits, distinguishing between certain shades of color, or interpreting certain signals that rely on color perception.
Protanopia, on the other hand, refers to a more severe form of color blindness in which individuals completely lack red-sensitive cones in their eyes. However, the term protan is typically used to specifically denote protanomaly rather than protanopia.
Tannin nucleoproteid, a combination of albumin and tannin; a light brown tasteless powder insoluble in water, employed as an astringent in diarrhea in doses of gr. 10-30 (0.6-2.0).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.