op-, opt-, optico-, opsi-, opso-, -opia, -ops, -opsia, -opsis, -opsy, -optic, -opic, -opy +

A defect of vision in which objects appear to have a greenish tinge.

A visual defect in which colored objects appear unnaturally colored and colorless objects appear tinged with color.

The chromatopsias are named for the colors seen: cyanopsia, blue; chloropsia, green; erythropsia, red; and xanthopsia, yellow.

Chromatopsia may be caused by drugs, disturbance of the optic centers, cataract extraction, or dazzling light.

1. Eyestrain from overwork or improper use of the eyes.
2. Fatigue of the eyes from misuse or overuse.

1. The positioning of the pupil of the eye other than in the center of the iris.
2. Eccentric (deviating from the center) location of the pupil so that it is not in the center of the iris.
3. An abnormal position, or displacement to one side of the center of the iris, of the eye pupil.
4. Displacement of the pupil from its usual central position, usually a developmental condition rather than the result of injury or inflammation.

Any of various plants of the genus Coreopsis in the composite family; especially, the North American species, having showy radiate flower heads with yellow or, rarely, purplish flowers.

A condition in which all objects appear blue; may temporarily follow cataract extraction.

A chromatopsia in which objects appear tinged with blue.

1. A watery state of the eye.
2. Excessive lacrimation.
3. The distention of a lacrimal duct by contained fluid.

The reduction, or dimness of vision, resulting from the non-use of the eye or eyes.

It is usually secondary to an organic problem; such as, cataract or ptosis (drooping of the upper eyelid or eyelids).

A visual defect in which the retina fails to respond to the color green; so named from blindness to the color green, which is regarded as the second primary color.

The condition, or state, of being dichromatic or exhibiting two colors.

A unit of measurement for the power of a lens, especially a spectacle lens, equal to the reciprocal of the focal length of the lens in meters.

The condition in which a single object appears as two objects.

Also called "double vision".

An exaggerated fear of having double vision. This phobia may be based on feeling of losing control of one's environment. Double vision may be due to a muscle imbalance or to paralysis of certain eye muscles.

1. Deranged vision of colors; color blindness.
2. Disorder of color vision; imperfect color vision.