ABO Ophthalmology Complete Practice Exam 2026

The range of wavelengths of light that is visible to humans is generally accepted to be between 380 and 750 nanometers. This range encompasses the various colors that can be perceived, starting from violet at the shorter wavelengths and extending to red at the longer wavelengths. The electromagnetic spectrum includes rays that are either shorter than ultraviolet or longer than infrared, which are not visible to the human eye.

The lower boundary of 380 nanometers corresponds to the ultraviolet light spectrum, while the upper boundary of 750 nanometers marks the transition to infrared light. This range includes all the colors of the visible spectrum: violet, blue, green, yellow, orange, and red. Understanding this range is crucial for disciplines such as ophthalmology and vision science, as it defines the light conditions that affect human vision and perception.