Just think of it this way: all natural light (i.e. the typical incoherent light you see reflected or emitted off of surfaces in your environment) emit wavefronts that eminate spherically from each reflection (or emission) point. As such, the spherical wavefronts from light eminating from objects close towards your eye (i.e. less than ~8m away, a.k.a optical infinity), will have a curvature that the optics of your eye (i.e. your cornea and lens) work or morph in order to focus into a point on your retina. The closer the object is to your eye, the greater the curvature (i.e. the higher the angle of divergence). However, objects further from your eye (i.e. greater than ~8m, or optical infinity), from your eye's perspective, will have a wavefront that is still curved, but that is essentially flat, such that your eye's optics do not have to morph to focus thes objects. All objects past optical infinity appear "in focus" unless your eye attempts to focus (i.e. the lens morphs or "accomodates") on an object in the foreground. A laser beam essentially emulates a flat wavefront because the photons comprising the beam have a very small angle of divergence. Thus, light eminating from a laser will appear in focus just like an object placed at optical infinity.
Actually, this is part of the principle underpinning the accomodation-vergence conflict.
