1. In a microscope, the lens closest to the eye is termed the ocular (the eyepiece) whereas the objective lens is the lens nearest to the object being examined.
2. The light microscope today is usually binocular (with one ocular for each eye) and has a turret bearing a selection of objective lens.
3. Relating to, perceived by, or performed by the eye.

A reference to the cerebrum (main portion of the brain) and the eye.

The sudden onset of severe ocular pain and photophobia.

A migraine involving the eyes that results in the distortion of visual images, accompanied or followed by a headache.

An ocular migraine usually affects only one eye at a time. Image distortion generally begins in the center of the image and then moves to one side.

Images "gray out" or look wavy, and sight may be lost temporarily.

A subjectively perceived problem of or a complaint of itching around the eyes.

The resistance offered by the eyeball to a change in intraocular (inside the eye) volume which is manifested as a change in intraocular pressure in the eye.

1. Using the left eye habitually or more effectively than the right eye.
2. Someone who prefers the left eye in monocular work; such as, in the use of a microscope.