strong astigmatism blurred vision german

strong astigmatism examples eyes one starker astigmatismus stark german germany stabsichtigkeit augenheilkunde brechungsfehler blurred vision focus distorted blurry sight irregular curvature cornea refractive error eyesight visual problem focusing disorder optical aberration anomaly rotational asymmetry highly cause pterygium ophthalmology surgery contact lenses glasses eyeglasses health care medicine