Glossary

Glossary

A

Amblyopia

Amblyopia is a dimness of vision, especially when occurring in one eye without apparent physical defect or disease.

Anisometropia

Anisometropia is a condition in which the refractive power of one eye differs from that of the other.

Astigmatism

Astigmatism is a visual defect in which the unequal curvature of one or more refractive surfaces of the eye, usually the cornea, prevents light rays from focusing clearly at one point on the retina, resulting in blurred vision.

C

Cataract

A cataract is clouding of the natural lens of the eye

Choroid

The choroid is the blood vessel layer under the retina.

Collagen

Collagen is the fibrous protein constituent of bone, cartilage, tendon, and other connective tissue. It is converted into gelatin by boiling

Contact Lens

A contact lens is a thin plastic or glass lens that is fitted over the cornea of the eye to correct various vision defects. An cataract is clouding of the natural lens of the eye

Cornea

The cornea is the transparent part of the coat of the eyeball which covers the iris and pupil and admits light to the interior.

D

Drusen

Drusen are small bright structures seen in the retina and in the optic disc.

E

Extra-capsular extraction

Extra-capsular extraction is used in cataract surgery. A small incision is made near the outer edge of the cornea and the cataract removed.

F

Farsightedness

Farsightedness is being unable to see close objects clearly; hyperopia.

Fovea Centralis

The fovea centralis is a small depression near the center of the retina, constituting the area of most acute vision.

G

Glaucoma

Glaucoma is increased pressure in the eyeball which causes damage to the optic disc and impairs vision (sometimes progressing to blindness)

Glaucoma

Glaucoma is increased pressure in the eyeball causes damage to the optic disc and impaired vision (sometimes progressing to blindness)

I

Intraocular Lens

An intraocular lens is an artificial lens that is implanted into the eye of someone to replace a damaged natural lens or someone who has had a cataract removed

Intraocular Pressure

Intraocular pressure is the pressure in the eye.

Iris

The iris is the pigmented, round, contractile membrane of the eye, suspended between the cornea and lens and perforated by the pupil. It regulates the amount of light entering the eye.

L

LTK

Laser Thermal Keratoplasty (LTK)

Lens

The lens is a transparent, biconvex body of the eye between the iris and the vitreous humor that focuses light rays entering through the pupil to form an image on the retina.

M

Macula

The macula is an opaque spot on the cornea

Macula Lutea

The macula lutea is a minute yellowish area containing the fovea centralis located near the center of the retina of the eye at which visual perception is most acute. Also called yellow spot.

Macular Degeneration

Macular degeneration is a condition in which the cells of the macula lutea degenerate, resulting in blurred vision and ultimately blindness

N

Nearsightedness

Nearsightedness is being unable to see distant objects clearly; myopic.

O

Ophthalmologist

An ophthalmologist is a medical doctor specializing in the treatment of diseases of the eye

Ophthalmology

Ophthalmology is the branch of medicine that deals with the anatomy, functions, pathology, and treatment of the eye.

Optic Disc

The optic disc is the point where the optic nerve enters the retina; not sensitive to light

Optic Nerve

The optic nerve is either of the second pair of cranial nerves that arise from the retina and carry visual information to the thalamus and other parts of the brain.

Optometrist

An optometrist is a person skilled in testing for defects of vision in order to prescribe corrective glasses

P

Phacoemulsification

Phacoemulsification is the removal of a cataract by emulsifying the lens ultrasonically.

Polymer

A polymer is any of numerous natural and synthetic compounds of usually high molecular weight consisting of up to millions of repeated linked units, each a relatively light and simple molecule.

Pupil

The pupil is the apparently black circular opening in the center of the iris of the eye, through which light passes to the retina

R

Retina

And the retina is a delicate, multi-layered, light-sensitive membrane lining the inner eyeball and connected by the optic nerve to the brain.

S

Strabismus

Strabismus is as a condition in which the eyes deviate (turn) when looking at the object of regard. There are 2 kinds. When the eye turn occurs all of the time, it is called constant strabismus. When the eye turn occurs only some of the time, it is called intermittent strabismus.

T

Trabecular Meshwork

Trabecular meshwork is the drainage system from which the watery fluid in the front part of the eye is drained out.

V

Vitreous Humor

The vitreous humor is the clear gelatinous substance that fills the eyeball between the retina and the lens.

 


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