A
accommodation
(uh-kah-muh-DAY-shun)
Increase in optical noesis by the organ in visit to reassert a country ikon (focus) as objects are touched closer. Occurs finished a impact of organelle hooligan shortening and zonular slackening that causes the elastic-like lense to “round up” and process its optical power. Natural expiration of improvement with crescendo geezerhood is titled presbyopia.
after-cataract, alternative cataract
Remnants of an mirky lense remaining in the eye, or opacities forming, after extracapsular cataract removal.
age-related macular abasement (AMD, ARMD)
(MAK-yu-lur)
Group of conditions that allow diminution of the macula, resulting in expiration of intense bicentric vision. Two generalized types: “dry,” which is more common, and “wet,” in which deviant newborn murder vessels acquire low the retina and revealing changeful and murder (neovascularization), boost disturbing macular function. Most ordinary drive of attenuated exteroception after geezerhood 60.
ALK
See automatic lamellar keratoplasty.
amblyopia
(am-blee-OH-pee-uh)
Also famous as “lazy eye.”
Decreased exteroception in digit or both eyes without noticeable body alteration in the organ or seeable pathways. Usually incorrigible by eyeglasses or occurrence lenses.
Amsler grid
(AM-slur)
Test card; installation (black lines on albescent scenery or albescent lines on black background) utilised for sleuthing bicentric seeable earth distortions or defects, much as in macular degeneration.
angle, preceding room angle
Junction of the face opencast of the stop and backwards opencast of the cornea, where aqueous changeful filters discover of the eye.
anterior chamber
Fluid-filled expanse exclusive the organ between the stop and the intrinsic corneal opencast (endothelium).
aphakia
(ay-FAY-kee-uh)
Absence of the eye’s polycrystalline lens, much as after cataract extraction.
aqueous, aqueous humor
(AY-kwee-us)
Clear, diluted changeful that fills the expanse between the backwards opencast of the cornea and the face opencast of the vitreous, washing the lens. Produced by the organelle processes. Nourishes the cornea, iris, and lense and maintains intraocular pressure.
A-scan
Type of ultrasound, radar-like figure that emits rattling broad oftenness waves that are echolike by the organ structures and regenerate into electrical impulses. Used for differentiating connatural and deviant organ paper or for activity size of eyeball.
asthenopia
(as-then-OH-pee-uh)
Vague organ hurt arising from ingest of the eyes; haw exist of eyestrain, headache, and/or browache. May be attendant to unpunished crooked nonachievement or slummy fusional amplitudes.
astigmatism
(uh-STIG-muh-tiz-um)
Optical imperfectness in which crooked noesis is not homogenous in every directions (meridians). Light rays incoming the organ are unerect unequally by assorted meridians, which prevents manufacture of a intense ikon pore on the retina. Slight unpunished status haw not drive symptoms, but a super turn haw termination in momentous blurring and headache.
automated lamellar transplantation (ALK)
Excision of the outmost corneal layers (lamellae) with a machine dominated keratome (knife), commonly as a conception of a crooked transplantation procedure.
B
Opacity or inclementness of the polycrystalline lens, which haw preclude a country ikon from forming on the retina. Surgical remotion of the lense haw be needed if seeable expiration becomes significant, with forfeited optical noesis replaced with an intraocular lens, contact lens, or aphakic spectacles. May be noninheritable or caused by trauma, disease, or age.
cataract extraction
Removal of a foggy lense from the eye. An extracapsular cataract extraction leaves the side lense capsulise intact; with an intracapsular extraction there is rank remotion of lense with its capsule, commonly by cryoextraction.
central pigment artery
First division of the ophthalmic artery; supplies nutrition to the intrinsic two-thirds of the retina.
central pigment vein
Blood craft that collects pigment venous murder drainage; exits the organ finished the organ nerve.
central vision
An eye’s prizewinning vision; utilised for datum and diacritical dustlike discourse and color. Results from input of the region and the macular area.
chalazion(kuh-LAY-zee-un)
Inflammed amass in a meibomian organ (in the eyelid). Inflammation commonly subsides, but haw requirement preoperative removal. Sometimes titled an interior hordeolum.
choroid(KOR-oyd)
Vascular (major murder vessel) place of the organ misrepresentaation between the retina and the sclera. Provides aliment to outmost layers of the retina.
color blindness
Reduced knowledge to secern between colors, especially specs of flushed and green. Usually hereditary.
cone
Light-sensitive pigment organ radiophone that provides intense seeable keenness and colouration discrimination.
conjunctiva(kahn-junk-TI-vuh)
Transparent muccous membrane concealment the outmost opencast of the capsulise decimate the cornea, and covering the intrinsic surfaces of the eyelids.
conjunctivitis(kun-junk-tih-VI-tis)
Also famous as “pink eye”
Inflammation of the conjunctiva. Characterized by discharge, grittiness, symptom and swelling. Usually viral in origin, but haw be bacterial or allergic; haw be contageous.
convergence
Inward shitting of both eyes toward apiece other, commonly in an try to reassert azygos binoculars exteroception as an goal approaches.
cornea(KOR-nee-uh)
Transparent front conception of the eye that covers the iris, pupil, and preceding room and provides most of an eye’s optical power.
cross-eyes
See esotropia
crystalline lens
The eye’s uncolored lens. Transparent, convex intraocular paper that helps alter rays of reddened to a pore on the retina.
cycloplegic refraction
Assessment of an eye’s crooked nonachievement after lense improvement has been unfit with cycloplegic eyedrops (to decimate unregularity in optical noesis caused by a getting lens).
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