Image-formation property of an optical system which focuses a single point source in object space into a single point in image space
normal eyesight (optics) condition of an optical system (as a lens) in which light rays from a single point converge in a single focal point the condition of having or being marked by stigmata
{i} condition of being affected with stigmas or stigmata; condition in which a lens properly focuses light rays; normal vision
(optics) condition of an optical system (as a lens) in which light rays from a single point converge in a single focal point