The Ishihara Test is a color vision test designed to identify color blindness, particularly red-green deficiencies. It consists of a series of plates filled with colored dots that form numbers or shapes, which can be seen differently by individuals with color vision deficiencies. Developed by Dr. Shinobu Ishihara in 1917, the test is widely used in various fields, including optometry and ophthalmology. It is simple to administer and requires no special equipment, making it accessible for screening in schools, workplaces, and medical settings.