Community Health Network

Ranked among the nation's most integrated healthcare systems, Community Health Network is Central Indiana's leader in providing convenient access to exceptional healthcare services, where and when patients need them—in hospitals, health pavilions, workplaces, schools and homes.

Explore Community

Close

Health library

En Español

Glossary - Eye Care

A | B | C | D | E | F | G | H | I | J | K | L | M
N | O | P | Q | R | S | T | U | V | W | X | Y | Z

A

accommodation - the ability of the eye to focus.

amblyopia - sometimes called "lazy eye;" is the reduction or dimming of vision in an eye that appears to be normal.

Amsler grid -  a chart featuring horizontal and vertical lines used to test vision.

anterior chamber - the front section of the eye's interior where aqueous humor flows in and out of providing nourishment to the eye and surrounding tissues.

astigmatism - a vision problem that results in blurred images.

B

binocular vision - the ability to use both eyes at once.

C

cataract - a change in the structure of the crystalline lens that causes blurred vision.

choroid - the thin, blood-rich membrane that covers the white of the eyeball; responsible for supplying blood to the retina.

ciliary body - the part of the eye that produces aqueous humor.

conjunctiva - the membrane that lines the exposed eyeball and the inside of the eyelid.

conjunctivitis - inflammation of the conjunctiva of the eye.

cornea - the clear, dome-shaped surface that covers the front of the eye.

corneal curvature - the shape of the front surface of the eye.

D

depth perception - the ability to distinguish objects in a visual field.

diplopia - double vision.

E

F

G

glaucoma - increased intraocular pressure that can result in optic nerve damage and loss of sight.

H

hyaloid canal - narrow passageway that allows blood to flow through the eye.

hyperopia - farsightedness.

I

iris - the colored part of the eye. The iris is partly responsible for regulating the amount of light permitted to enter the eye.

J

K

keratitis - inflammation of the cornea.

L

lens (also called crystalline lens) - the transparent structure inside the eye that focuses light rays onto the retina.

M

macula - the portion of the eye that allows us to see fine details clearly.

macular degeneration - degeneration in the macular region of the retina that results in decreased central vision and sometimes, in blindness.

miosis - constriction of the pupil.

mydriasis - dilation of the pupil.

myopia - nearsightedness.

N

near point of accommodation - the closest point in front of the eyes that an object may be clearly focused.

near point of convergence - the maximum extent the two eyes can be turned inward.

O

ocular hypertension - high (greater than 21 mm Hg) intraocular pressure.

ophthalmoscopy - examination of the internal structure of the eye.

orthokeratology - the use of contact lenses to change the shape of the cornea in order to correct refractive error.

optic nerve - a bundle of more than one million nerve fibers that connects the retina with the brain. The optic nerve is responsible for interpreting the impulses it receives into images.

P

photophobia - sensitivity to light.

photorefractive keratectomy (PRK) - surgical procedure using an excimer laser to change the shape of the cornea.

pinguecula - irritation caused by the degeneration of the conjunctiva.

posterior chamber - the back section of the eye's interior.

posterior optical segment - portion of the eye located behind the crystalline lens, and including the vitreous, choroid, retina, and optic nerve.

posterior vitreous detachment (PVD) - the separation of the vitreous from the retina.

presbyopia - a form of farsightedness in which it is difficult to focus on close objects or to read.

pupil - the dark center in the middle of the iris through which light passes to the back of the eye.

pupillary response - the constriction or dilation of the pupil as stimulated by light.

Q

R

radial keratotomy - a surgical procedure in which incisions are made into the epithelium of the cornea to correct refractive error.

refractive error - the degree to which light reaches the back of the eye - myopia, hyperopia, astigmatism.

retina - the light-sensitive nerve layer that lines the back of the eye. The retina senses light and creates impulses that are sent through the optic nerve to the brain.

retinal detachment - separation of the retina from the epithelium layer and from its blood supply.

S

sclera - the white visible portion of the eyeball. The muscles that move the eyeball are attached to the sclera.

scotoma - an area of partial or complete loss of vision surrounded by an area of normal vision.

stereopsis - ability to perceive three-dimensional depth.

suspensory ligament of lens - a series of fibers that connect the ciliary body of the eye with the lens, holding it in place.

T

tonometry - test to measure intraocular pressure for glaucoma.

U

V

visual acuity - the space visible to an eye in a given position of gaze.

vitreous body - a clear, jelly-like substance that fills the center of the eye.

W

X

Y

Z

Proud sponsors

  • Indiana Fever
  • Indianapolis Indians
  • Indiana Pacers
  • Sarah Fisher Hartman Racing
  • Indy Eleven
  • Indy Fuel

Health and wellness shopping

  • Home Health Medical online store for medical supplies and equipment
  • Wellspring Pharmacy
  • FigLeaf Boutique
  • Jasmine gift shop