[{"Bold_text": "noun", "List Items": ["Also calleda·stig·mi·a[uh, -, stig, -mee-, uh].Ophthalmology.a refractive error of the eye in which parallel rays of light from an external source do not converge on a single focal point on the retina.", "Optics.an aberration of a lens or other optical system in which the image of a point is spread out along the axis of the system."]}]