ICD-11 definition : 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.;
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.