Lennox-Gastaut syndrome
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.
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- Lens
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.
- Lentigines
When there is one lentigo, there are usually more lentigines.