astigmatism lietuviškai

Paaiškinimas anglų kalba

• (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point
• (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people
• Unequal curvature of the refractive surfaces of the eye. Thus a point source of light cannot be brought to a point focus on the retina but is spread over a more or less diffuse area. This results from the radius of curvature in one plane being longer or shorter than the radius at right angles to it. (Dorland, 27th ed)