A defect of the cornea or lens of the eye that causes blurred vision.
A condition that occurs because the cornea (outer lens of the eye) is not the correct spherical shape. Light rays from an object do not focus on the retina; they focus in front of or behind the retina, so the object appears blurred.
A defect of the refractive surface of the eye that distorts light rays so that they cannot focus on a single point on the retina.
Defective vision caused by change in curvature of cornea and lens.
A condition in which the eye cannot focus vertical and horizontal lines simultaneously, leading to blurring of vision.
Uneven curve of the cornea or lens.
A refractive anomaly due to unequal refraction of the incident light by the dioptric system of the eye, in different meridians.
Blurring or distortion of vision from a misshapen cornea in the eye.
Defect in vision in which the light rays cannot be focused properly on the retina because of abnormal curvature of the cornea or lens of the eye; corrective lenses improve vision.