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

1. A difference in the refractive power of the two eyes.
2. Having eyes of unequal refractive power.
3. A condition in which the refractive power of one eye differs from that of the other.

A difference in refractive error between the two eyes, both of which are myopic.

A difference in vision between the two eyes.

1. Partial color blindness in which both red and green are poorly recognized.
2. A form of color blindness where reds and greens look much the same.

Absence of sight; especially, as a result of a structured defect in or absence of an eye (or eyes): Jane, a young woman, suffered from lifelong anoxia because she was born that way.

Being without correct vision or having distorted vision in which straight lines appear as curves or angles, and symmetry is incorrectly perceived: Dr. Smith, the ophthalmologist, was monitoring the anorthopia of the patient who described a badly formed view of curved and straight lines.

A difference in the refractive error (deviation from optimal focusing of light) of the two eyes; such as, hyperopia (farsightedness) in one eye with myopia (nearsightedness) in the other.

Suppression amblyopia or "lazy eye": Argamblyopia is due to long disuse of the eye.

In amblyopia, or argamblyopia, the brain favors one eye over the other. The other eye is ignored. It is not adequately stimulated and the visual brain cells do not mature normally. Amblyopia is the most common cause of monocular blindness, partial, or complete blindness in one eye.

Eye weakness, or strain; often causing a headache, ocular discomfort, dimness of vision, etc.: Nigel's asthenia included such symptoms as fatigue, red eyes, eye strain, pain in or around the eyes, blurred vision, and occasional double vision.

1. Personal observation.
2. An ocular view.
3. A postmortem examination.

1. An exhaustive critical personal examination or inspection of something: Mrs. Jones students were asked to do an autopsy, or a discerning analysis, of the book they had to read for their English class.
2. The examination, after death, of an animal body, usually human, with the intent of determining the cause of death, the extent of a disease or injuries, the effect of therapy, and the existence of any previously unrecognized antemortem pathological condition: After Mary’s young cat, Mini, died, she wanted to know whether it had been poisoned and so an autopsy was performed by the veterinarian. © ALL rights are reserved.

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A defect of vision in which the retina fails to respond to yellow.

Blindness in the nasal half of the visual field in each eye.

Blindness in the temporal half of the visual field in each eye.

The temporal halves are located on each side of the head, back of the eyes and forehead, above the zygomatic arch and in front of the ears.

1. The drooping of the upper eyelid resulting from paralysis.
2. Drooping of an upper eyelid because of paralysis.

Causes include aging, diabetes, stroke, Horner's syndrome (nerve condition which involves a dropping eyelid), myasthenia gravis (fatigue of certain voluntary muscle groups), brain tumor or cancer.