When referring to the eye, this term indicates inward direction toward the nose. Also refers to
that half of the eye or visual field from the middle of the eye inward.
nasal lacrimal system
That portion of the lacrimal (tear producing) system that includes ducts which drain tears
from the eye into the nose.
nasal lacrimal duct
Tear drainage channel that extends from lacrimal sac to opening in mucous membrane of
nose.
nearsightedness
Also called myopia. The front curvature of the cornea is too steep in a
nearsighted person resulting in good reading vision but poor distance vision.
See Free Eye Tests.
nutrition
Process by which a living organism assimilates food and uses it for growth and
tissue replacement. In the prevention of ocular disease, the role of vitamins and
minerals has taken on a major role. To maintain the health of the eye, a high-fiber,
high-carbohydrate, high-antioxidant, low-fat, low-protein diet is best.
nystagmus
Involuntary, rhythmic side-to-side or up-and-down eye movements in which movement to
one direction is faster than movement to opposite direction.
See Free Eye Tests.
