1. An optical system for directing a light beam to an irido-corneal angle of an eye, the eye having a direction of view and a cornea with a refractive index nc, the optical system comprising:a first optical subsystem having optical aberrations, and comprising:
a window formed of a solid optical material with a refractive index nw , the window having a concave surface and a convex surface opposite the concave surface, and
an exit lens formed of a solid optical material having a refractive index nx, the exit lens having a concave surface and a convex surface opposite the concave surface, wherein the concave surface of the exit lens is configured to couple to the convex surface of the window to define a first optical axis extending through the window and the exit lens; and
a second optical subsystem configured to output a light beam, wherein:
the first optical subsystem is optimized for angled optical access that at least partially compensates for the optical aberrations of the first optical subsystem, the angled optical access being along a second optical axis at an angle a that is offset from the first optical axis,
the light beam is directed to be incident at the convex surface of the exit lens along the second optical axis,
the concave surface of the window is configured to detachably couple to the cornea of the eye such that the first optical axis is generally aligned with the direction of view, and
the respective refractive indices nw, and nx are configured to direct the light beam incident at the convex surface of the exit lens through the cornea of the eye toward the irido-corneal angle.