At the same time that range lasers were developing, intraocular surgery techniques, which had been performed with magnifying eyeglasses, started being performed with operating microscopes. ese microscopes, along with slit lamps and ophthalmoscopes, became the obvious delivery systems for coherent light into the eye. ey were modied to allow coaxial placement of the light source along with the optical system and an aiming beam, mostly HeNe lasers of power small enough not to damage eye structures.