Category: R

Inflammation of the retina, the innermost part of the eye. Inflammation of the retina. In practice, the term is often used for conditions not strictly inflammatory; for example retinitis pigmentosa, a non-inflammatory hereditary condition involving progressive degeneration of the retina. For such conditions the term retinopathy is becoming more widely used. Symptoms include diminished vision,…

The image of an object that is projected on the retina. Its size increases with the size of the object and decreases with its distance from the eye.  

Uncontrolled bleeding from vessels within the eye’s retina. Bleeding from small blood vessels in the surface of the retina. Retinal hemorrhage is usually caused by extremely violent force to the eye; it is a common sign of shaken baby syndrome, a type of severe child abuse. The condition can also result from falls from at…

A dynamic cue that signals when objects are approaching and when they are receding, providing a dynamic cue to depth.  

The visual process whereby the two eyes receive slightly different images of the same object, which provides a very sensitive primary cue to depth.  

A condition in which the retina becomes detached from the choroid and sclera. A condition in which the retina is partly detached from the choroid. Separation of the retina from the choroid layer of the eye due to trauma, aging, or diabetes causing the blood vessels to become increasingly fragile. Separation of the retina from…

The structure of the eye that contains the visual receptors and several layers of neurons farther along the pathway to the brain. The inside layer of the eye which is sensitive to light. Light-sensitive layer at the back of the eye. Multilayered light-sensitive layer of the eye that receives images of objects and transmits visual…

A form of lymphoma. A rare form of malignant large cell lymphoma.  

A diffuse neural projection system that, in response to stimulation, arouses the cortex. Cluster of nerve cells and nerve fibers in the brainstem connecting nerves to and from the spinal cord, cranial nerves, and areas of the brain; it constantly monitors the state of the body and functions in the control of breathing, heart rate,…

The system of nerve pathways within the brain that is involved in arousal. System of nerve pathways in the brain concerned with the level of consciousness, from sleep and relaxation to full attention and concentration. The system of nerve pathways in the brain concerned with the level of consciousness, from the states of sleep, drowsiness,…