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The continuous interval or set of wavelengths (measured in nanometers or meters) that defines a specific portion of the electromagnetic spectrum, such as the visible light spectrum or the infrared range.
read more about wavelength range ...The visible light wavelength range spans approximately $380 ext{ nm}$ (violet) to $750 ext{ nm}$ (red). Only wavelengths within this range can stimulate the photoreceptors to produce vision.
Wavelengths shorter than $380 ext{ nm}$ are Ultraviolet (UV); wavelengths longer than $750 ext{ nm}$ are Infrared (IR). Both are invisible to the human eye but have biological effects.
Eyewear manufacturers specify the wavelength range over which a lens provides $100\%$ protection (e.g., UV protection up to $400 ext{ nm}$).
Wavelength is typically measured in nanometers ($ ext{nm}$) for visible light and micrometers ($\mu ext{m}$) for infrared radiation.
UV radiation (especially UVA and UVB) can damage the cornea and the lens, contributing to cataracts and photokeratitis.
The cornea absorbs most UVB, and the lens absorbs most UVA. Neither is perfectly opaque, hence the need for sunglass protection.