an ion laser, using argon as the active medium, with two dominant wavelengths—514 nm “green” and 488 nm “blue”—used in argon laser trabeculoplasty (ALT) in which the fluid channels of the trabecular meshwork of the eye are opened, helping aqueous fluid to drain out of the eye more easily and reducing intraocular pressure to help control glaucoma; also used to treat neovascularization in diabetic retinopathy, where the hemoglobin in blood cells absorbs the laser light, causing heat damage and sealing of the blood vessels and controlling further bleeding into the vitreous

laser light produced from argon gas. Nine separate wavelengths in the blue-green visible light spectrum are produced, but the main wavelengths are 488.0 nm blue and 514.5-nm pea green light.

a green or blue-green laser