Category: O

A picture (image) on the retina. The image of an external object that is fixed on the retina by the photochemical bleaching action of light on the visual purple.  

The level of population that allows all people to have a high quality of life, maximum carrying capacity.  

The ability to direct attention toward relevant attributes and to obtain desired information from the environment.  

The intelligence that is most appropriate to a particular task. Not necessarily maximal intelligence.  

The highest level of functioning of which a person is capable under the existing environmental constraints.  

The nerve of sight that enables visual images to pass from the retina to that portion of the brain where they are interpreted. Nerve that carries electrical signals from the retina to the brain. One of a pair of sensory nerves, the second cranial nerves, that arise in the retina and transmit visual impulses from…

A person who specializes in the preparation of corrective lenses. A qualified person who specialises in making glasses and in testing eyes and prescribing lenses. Person who examines eyes. A health professional who specializes in grinding and fitting eyeglasses or contact lenses, according to prescriptions given by an optometrist or ophthalmologist. Person who grinds and…

The entrance of optic nerves into the retina. The point on the retina where the optic nerve starts. A small circular portion of the retina where the optic nerve passes through and does not have visual capacity. Otherwise known as the blind spot of the eye, the disc is the beginning of the optic nerve…

The crossing of the optic nerves on the ventral surface of the brain. A structure where some of the optic nerves from each eye partially cross each other in the hypothalamus. This is formed by a crossing-over of the two optic nerves which run from the back of the eyeballs to meet in the mid…

A disease that results from deteriorating nerve fibers connecting the retina to the brain. A condition in which the eye’s optic nerve has been damaged. Wasting away of the optic disc, the area where the optic nerve joins the retina (the thin light-sensitive layer in the back of the eye). Optic atrophy indicates degeneration of…