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

The inability to visualize correctly the size of objects.

They appear larger than they really are.

The inability to visualize correctly the size and shape of things.

Defective vision, with distortion of the shape of objects perceived.

1. Defective, or incorrect, vision.
2. Pain in the eyes when looking intently at objects.

1. An imaginary place where everything is as bad as it possibly can be, or a vision or description of such a place.
2. A hypothetical place, state, or situation in which conditions and the quality of life are dreadful.
3. The opposite of what one would expect in a utopian society.
4. In medicine, a malposition, or displacement, of a bodily organ.

1. The normal refractive condition of the eye in which there is clear focus of light on the retina. 2. An ideal optical condition when parallel light rays come to a focus on the retina.
3. That refractive condition of the eye in which the rays of light are all brought accurately and without undue effort to a focus upon the retina; opposed to hypermetropia (farsightedness), myopia (nearsightedness), and astigmatism; or the refractive condition of the eye in which the rays of light are all brought accurately, and without undue effort, to a focus upon the retina.

An ingrown eyelash.

1. A chromatopsia in which objects appear tinged with red.
2. An abnormality of vision in which all objects appear to be tinged with red.

Good, or normal, eyesight.

The condition whereby people see normally, free of any symptoms or complaints.

1. Eyes that are open wide.
2. Abnormally wide opening of the eyes.

A branch of optical technology dealing with systems that transmit light signals and images over short, and long, distances through the use of optical fibers (transparent, hair-thin strands of glass or plastic).

These fibers have a wide range of applications; such as, in the transmission of computer data, telephone messages, and other communications.

1. Defective vision, or blindness, in half of the visual field; usually applied to bilateral defects caused by a single lesion.
2. Any of several conditions in which there is blindness in half of the visual field, involving one or both eyes.

The state, or condition, of the eyes in which there are differences in degrees of refraction; or the ability of the eyes to change the direction of light in order to focus it on the retina.

1. Unequal vision in the two eyes.
2. Inequality of vision in both eyes.