1. The act or power of seeing objects with the eyes: Matt and his family were able to enjoy the visions of extraordinary beauty on their summer vacation in the national parks.
2. The act or power of anticipating that which will or may come to be: Sharon's prophetic visions of what would happen with Ken's investments in his business encouraged him to proceed with his ideas.
3. An experience in which a person, thing, or event appears vividly or credibly to the mind: Although Ben's vision of the future was not actually present, he was still convinced that he had to commit himself to strive for those goals.
4. A vivid, imaginative conception or anticipation: Mary's husband had visions of wealth and glory all of which were only in his mind and not actual.

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The inability to perceive, or to see, colors: The doctor told Sam that his achromatic vision was a result of a severe congenital deficiency in color perception which might be associated with nystagmus (the involuntary rapid rhythmic movements of his eyeballs) and reduced visual acuity (loss of the ability to detect fine details or small distances with the eyes).

The doctor also indicated that he has several other patients with similar abnormal achromatic visions.

The simultaneous use of both eyes, resulting in seeing which incorporates images with depth perception.

A bluish discoloration of perceived objects or things that are seen.

1. The part of a field that is seen near an object at which the eye is directed or straight-ahead sight as opposed to peripheral seeing.
2. The physiological sense of sight by which the form, color, size, movements, and distances of objects are perceived: Central vision permits a person to read, to drive, or to perform other activities that require fine, sharp, straight-ahead viewing.

1. Color vision or the normal ability to see colors.
2. The perception and evaluation of the colors of the spectrum.
2. The ability to see or to perceive the color hues normally stimulated by the various parts fo the visible spectrum.

A form of color vision in which only two special hues, or two of the three primary colors, can be seen.

The observation of an object on which the part of the retina of each eye distinguishes the fine details at the center of the field of vision that the eyes are focused on: Dr. Rebecca Bond, the ophthalmologist, determined that Joseph’s direct vision was normal because the image of the item he saw fell directly on the yellow spot, or macula lutea, of his eyes.

The fixation of the eyes with a part of the retina other than the fovea.

The fovea is located in the eye, a tiny pit located in the macula of the retina (a small spot in the eye where vision is sharpest) which provides the clearest vision of all.

Only in the fovea are the layers of the retina spread aside to let light fall directly on the cones, the cells that give the sharpest image.