RT Book, Section A1 McHugh, James A1 Pringle, Edward A2 Riordan-Eva, Paul A2 Augsburger, James J. SR Print(0) ID 1144470622 T1 Lasers in Ophthalmology T2 Vaughan & Asbury's General Ophthalmology, 19e YR 2017 FD 2017 PB McGraw-Hill Education PP New York, NY SN 9780071843539 LK accessmedicine.mhmedical.com/content.aspx?aid=1144470622 RD 2024/04/25 AB “Laser” is an acronym for light amplification by stimulated emission of radiation. Most light sources radiate energy in all directions, with waves that are out of phase (incoherent), and with multiple wavelengths. By contrast, laser light has a single wavelength (monochromatic) and waves that are in phase (coherent) with very little tendency to spread out (collimated), so they can illuminate with extremely high power (irradiance). A 1-watt laser produces a retinal irradiance approximately 100 million times greater than a 100-watt light bulb.