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

A visual defect in which the retina fails to respond to the color red; so named from blindness to the color red, which is regarded as the first of the primary colors.

1. Mind blindness.
2. Visual agnosia, or the inability to recognize objects by sight.

The subject sees the object, but cannot identify it; because of a lesion in the area of the occipital cortex.

A previous term for autopsy.

A bright-red photosensitive pigment found in the rod-shaped cells of the retina of certain fish and most higher vertebrates.

It is broken down by the action of dim light into retinal (layer of neurons, or nerve cells, that line the back of the eye) and opsin (several compounds that form the protein component of the light-sensitive retina pigment).

1. The adaptation of the eye to darkness.
2. Loss of color perception, with the ability to discern only shades of black and white.
3. Vision when the eye is adapted to the dark; also: night vision, rod vision, and twilight vision.

1. Improved near vision in the aged as a result of increased refractivity of the nucleus of the lens causing myopia.
2. The power of discerning what is not visible to the physical eye, or of foreseeing future events; such as are of a disastrous kind, the capacity of a seer or prophetic vision.

1. A change of vision in old people whereby myopia is corrected to normal vision.
2. Improvement in near vision of old people.

It usually precedes the development of nuclear (nucleus membrane) cataract (opacity of the lens of the eye, its capsule, or both).

The narrow opening of the eyelids.

The ability to perceive depth, or the ability to see three-dimensionally.

The person must be binocular before such actions can take place.

A "magic lantern", especially one with two projectors arranged so as to produce dissolving views.

1. A brief outline or general view; such as, a subject or written work resulting in an abstract or a summary.
2. A sketchy summary of the main points of an argument or a theory.
3. A brief description of the contents of something such as a film or book.
4. Etymology: from Late Latin synopsis, "a synopsis"; from Greek synopsis, "general view"; from a stem of synoran, "to see altogether, to see all at once"; from syn-, "together" + opsis, "to see, to view".

To make a synopsis of; to summarize.

Making a sketchy summary of the main points of an argument or a theory.

1. Constituting a synopsis; that is, presenting a summary of the principal parts or a general view of the whole of something.
2. In meteorology, relating to data obtained nearly simultaneously over a large area of the atmosphere.
3. Taking a common view; used chiefly in reference to the first three Gospels, known as the "synoptic Gospels"; specifically, Matthew, Mark, and Luke, from their similarity in their contents, order, and statements.

1. Defective vision or blindness in one fourth of the visual field.
2. A rare type of dichromatic vision (defective color vision in which one of the three cone pigments is missing) of doubtful existence, characterized by perception of red and green only, with blue and yellow perceived as an achromatic (gray) band.