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The Eye 7:7

Essentials of Healthcare Chapter 7:7

TermDefinition
Amblyopia lazy eye. Occurs in early childhood. It results in poor vision in one eye and is caused by the dominance of the other eye.
Astigmatism Abnormal shape or curvature of the cornea that causes blurred vision.
Cataract Occurs when the normally clear lens becomes cloudy or opaque.
Conjunctivitis Pink eye, a contagious inflammation of the conjunctiva and is usually caused by a bacterium or virus.
Glaucoma Condition of increased intraocular pressure caused by an excess amount of aqueous humor.
Hyperopia Farsightedness. Occurs when the light rays are not refracted sharply enough and the image focuses behind the retina.
Macular Degeneration Major cause of vision loss and blindness, a disease of the macula, the central and most sensitive section of the retina.
Myopia Nearsightedness. Occurs when the light rays are refracted too sharply and the image focuses in front of the retina.
Presbyopia Farsightedness caused by a loss of lens elasticity.
Strabismus The eyes do not move or focus together.
Night blindness Condition that makes it difficult so see at nigh. The rod cells in the retina are affected.
Color blindness The inability to distinguish colors.
Diplopia Blurred vision.
Optometrists A person who practice optometry.
Opticians A person who gives you glasses.
Opthamologist A specialist with the study and treatment with disorders of the eye.
Which area in the brain is responsible for vision? Opcipital
Which area of the brain is responsible for conducting impulses for certain eye reflexes? Midbrain
The eye is well protected by what bony socket of the skull? Orbital
What helps keep out dirt and pathogens? Eyelids and eyelashes
What is the purpose of the lacrimal glands? Where are they located? Produce tears; in the eyelids
Where is the lacrimal duct located and where does it drain? Corners of the eye and in the nasal.
What is the Conjunctiva? Covers the eye; produce mucus; lubricate the eye.
What are the 3 main layers of the eye? Sclara, Cornea, Choroid coat, Retina
What is the purpose of the Sclara? Maintain eye shape.
What is the purpose of the Cornea? Allows rays to enter the eye.
What is the purpose of the Choroid coat? Blood vessels nourish the eye.
What is the purpose of the Retina? Transmit impulses to optic nerve.
What is attached to the outside of the sclera that is responsible for moving the eye within the socket? Extrinsic Muscle
What is the transparent circular part of the front of the eye and its purpose? Cornea; controls the entrance of light.
What is the difference between cones and rods? Cone- color vision Rods- dark Dem light
What is the colored portion of the eye? Iris; locate behind the cornea
What is the opening in the center of the iris? Pupil
What is the circular structure located behind the pupil? Lens
What is the aqueous humor? clear watery fluid that fills the space between the cornea and iris.
What is the vitreous humor? clear gel
Created by: briianna