Name the defect of the eye in which a portion of the object is seen focused while the other portion is blurred.

The correct option is A

Astigmatism

Astigmatism is the defect of the eye that arises due to the uneven curvature of the cornea. It is a defect in which a portion of the object is seen focused while the other portion is blurred. It can be corrected by cylindrical lenses. Night-blindness is a condition in which a person feels difficulty in seeing in dim light or during the night. Long-sightedness is where a person feels difficulty in seeing near objects. Whereas in short-sightedness a person feels difficulty in seeing distant objects.