Astigmatism is a noun that means a refractive error caused by irregular curvature of the cornea or lens, resulting in blurred or distorted vision.
A refractive error caused by irregular curvature of the cornea or lens, resulting in blurred or distorted vision.
A common medical term but specialized in everyday educated usage; usually encountered in discussions of vision and eye care.
Astigmatism is a noun.
Astigmatism has unlikely GRE relevance.
refractive error , visual distortion