Ligneous conjunctivitis is a rare, long-lasting type of conjunctivitis (inflammation of the eye’s thin lining, the conjunctiva). The word ligneous means ...
Light–near dissociation means your pupils don’t get smaller when a bright light shines in the eyes, but they do get smaller when you look at something close ...
Idiopathic Intracranial Hypertension means the pressure inside the skull (and around the brain and optic nerves) is too high even though scans do not show a ...
Every time you blink, a very thin strip of tissue on the inner edge of your upper eyelid acts like a tiny windshield wiper. It spreads tears smoothly across ...
Leukocoria literally means “white pupil.” Instead of the normal black opening in the center of the eye, you see a white, yellow-white, or grayish shine when ...
Leukemic optic neuropathy means the optic nerve—the cable that carries visual signals from your eye to your brain—is injured because of leukemia or its ...
Leprosy—also called Hansen’s disease—is a long-lasting bacterial infection that mainly attacks the skin and the peripheral nerves (the nerves outside the brain ...
Glaucoma is damage to the eye’s optic nerve caused by pressure inside the eye that is too high for that eye to tolerate. Lens-induced glaucoma happens when ...
Leigh syndrome (also called subacute necrotizing encephalomyelopathy) is a rare, serious brain disease that mostly begins in babies or young children. It ...
LeFort fractures are specific break patterns in the middle of the face (the “midface”). They were first mapped by a French surgeon, René Le Fort, who studied ...
Leber Hereditary Optic Neuropathy—usually shortened to LHON—is an inherited eye condition that mainly affects the optic nerve, the cable that connects your eye ...
LCA is a group of rare, inherited eye conditions that start at birth or soon after. The problem lives in the retina, the “camera sensor” at the back of the ...
Lattice degeneration is a thinning and weakening of the far-edge (peripheral) retina. Under a dilated eye exam, the thin patches look like narrow, criss-cross ...
Lattice corneal dystrophy is an inherited eye disease. “Inherited” means it is passed down in families through genes. It affects the cornea, the clear front ...
LASIK is laser eye surgery that reshapes the clear front window of the eye (the cornea) so light focuses properly on the retina. A very thin flap is made on ...
LASIK is laser eye surgery that reshapes the clear front window of the eye (the cornea) so you can see without glasses. A very thin flap is made on the ...