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accommodation

Overview page. Subjects: Medicine and Health — Psychology.

n. adjustment of the shape of the lens to change the focus of the eye. When the ciliary muscle (see ciliary body) is relaxed, suspensory ligaments attached to the ciliary body...

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albinism

Overview page. Subjects: Medicine and Health — Biological Sciences.

Hereditary lack of pigmentation (see melanin) in an organism. Albino animals and human beings have no colour in their skin, hair, or eyes (the irises appear pink from underlying blood...

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aqueous humour

Overview page. Subjects: Science and Mathematics — Medicine and Health.

The watery fluid that fills the chamber of the eye immediately behind the cornea and in front of the lens. It is continually being formed – chiefly by capillaries of the ciliary processes –...

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autonomic nervous system

Overview page. Subjects: Medicine and Health — Science and Mathematics.

That part of the nervous system that controls and regulates involuntary body functions (e.g. digestion, heart rate, and temperature regulation). It is divided up into the sympathetic and...

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blind spot

Overview page. Subjects: Psychology — Medicine and Health.

The small area of the retina of the eye where the nerve fibres from the light-sensitive cells (see cone, rod) lead into the optic nerve. There are no rods or cones in this area and hence it...

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bloodshot

Overview page. Subjects: Medicine and Health.

Applied to eyes, this refers to visible blood in or behind the conjunctiva. The conjunctiva is supplied by minute blood vessels. Redness is apparent if these are dilated by irritation ...

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body fluids

Overview page. Subjects: Medicine and Health.

A term that includes blood, tears, sweat, serous and mucous secretions from all bodily orifices, saliva, urine, and semen. In clinical usage, the term refers to body fluids that can...

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brainstem

Overview page. Subjects: Medicine and Health — Science and Mathematics.

n. the enlarged extension upwards within the skull of the spinal cord, consisting of the medulla oblongata, the pons, and the midbrain. The pons and medulla are together known...

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Brown's syndrome

Overview page. Subjects: Medicine and Health.

A condition, usually congenital, in which the tendon sheath of the superior oblique muscle of the eye does not relax, thus limiting the elevation of the eye, especially in adduction. H. W....

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choroid

Overview page. Subjects: Medicine and Health.

n. the layer of the eyeball between the retina and the sclera (see also Bruch’s membrane). It contains blood vessels and a pigment that absorbs excess light and so prevents...

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