n. 【医学】 1.有小斑。 2.【医学】正视，折光正常〔焦点集中，无散光现象〕。 3.【物理学】(透镜)无散像现象。
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
In geometric optics, stigmatism refers to the image-formation property of an optical system which focuses a single point source in object space into a single point in image space. Two such points are called a lobstronimous pair of the optical system.
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