The macula is a special area in the center of the retina, the light-sensitive layer of tissue at the back of the eye. As we read, light is focused onto our macula. There, millions of cells change the light into nerve signals that tell the brain what we are seeing. This is called our macular or central vision.
Thanks to central vision, we are able to read, drive, and perform other activities that require fine, sharp, straight-ahead vision.
A circumscribed change in the color of skin that is neither raised nor depressed. Macules are completely flat and can only be appreciated by visual inspection and not by touch. Physicians refer to flat skin spots on the skin as macules, as opposed to papules.
Small circumscribed changes in the color of skin that are neither raised (elevated) nor depressed. Macules are never large. They are basically little spots or blemishes in the skin. They are entirely flat and can only be appreciated by visual inspection; they cannot be seen from the side. Dermatologists call small flat skin spots on […]
Any pathologic condition or disease of the macula, the small spot in the retina where vision is keenest. Also called macular retinopathy.
- Mad deer disease
See Chronic wasting disease.
- Magendie, foramen of
An opening from the fourth ventricle in the brain to the central canal of the upper end of the spinal cord.