Cornea vs. Nebula — What's the Difference?

The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. The cornea, with the anterior chamber and lens, refracts light, with the cornea accounting for approximately two-thirds of the eye's total optical power.

A nebula (Latin for 'cloud' or 'fog'; pl. nebulae, nebulæ or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases.

The transparent convex anterior portion of the outer fibrous coat of the eyeball that covers the iris and the pupil and is continuous with the sclera.

A cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.

(anatomy) The transparent layer making up the outermost front part of the eye, covering the iris, pupil, and anterior chamber.

A clouded spot on the cornea causing defective vision.

The transparent part of the coat of the eyeball which covers the iris and pupil and admits light to the interior. See Eye.

A diffuse cloud of interstellar dust or gas or both, visible as luminous patches or areas of darkness depending on the way the mass absorbs or reflects incident light or emits its own light.

Transparent anterior portion of the outer covering of the eye; it covers the lens and iris and is continuous with the sclera

A galaxy. No longer in technical use.

A cloudy spot on the cornea.

A liquid preparation for use in a nebulizer.

(astronomy) A cloud in outer space consisting of gas or dust (e.g. a cloud formed after a star explodes).

A white spot or slight opacity of the cornea.

A cloudy appearance in the urine.

A faint, cloudlike, self-luminous mass of matter situated beyond the solar system among the stars. The term was originally applied to any diffuse luminous region. Now, technically, it is applied to interstellar clouds of dust and gases (diffuse nebula). However distant galaxies and very distant star clusters often appear like them in the telescope, such as the spiral nebula in Andromeda, known now to be a distant galaxy.

A white spot or a slight opacity of the cornea.

A medicinal liquid preparation intended for use in an atomizer

Cloudiness of the urine

An immense cloud of gas (mainly hydrogen) and dust in interstellar space

(pathology) a faint cloudy spot on the cornea