A severe form of epilepsy that usually begins in early childhood. It is characterized by frequent seizures of multiple types, mental impairment, and a slow spike-and-wave pattern seen on an EEG. The seizures are notoriously hard to treat and may lead to falls and injuries. Treatment involves anti-epileptic medications.
The transparent structure inside the eye that focuses light rays onto the retina.
- Lens, intraocular
An artificial lens made of plastic, silicone, acrylic or other material that is implanted in the eye during cataract surgery. Abbreviated IOL.
- Lens, objective
In a microscope, the lens nearest to the object being examined. Most light microscopes now have a turret that bears a selection of objective lenses.
- Lens, ocular
In a microscope, the lens closest to the eye. Also known as eyepiece. Most light microscopes are binocular, with one ocular lens for each eye.
When there is one lentigo, there are usually more lentigines.