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231 Cards in this Set

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Accommodation
The adjustment of the eye for seeing at near distances, accomplished by changing the shape of the lens through action of the ciliary muscle, thus focusing a clear image on the retina.
Agnosia
Inability to recognize common objects despite an intact visual apparatus.
Albinism
A hereditary deficiency of melanin pigment in the retinal pigment epithelium, iris, and choroid.
Amaurosis fugax
Transient loss of vision.
Amblyopia
Reduced visual acuity (uncorrectable with lenses) in the absence of detectable anatomic defect in the eye or visual pathways.
Ametropia
See Refractive error.
Amsler grid
A chart with vertical and horizontal lines used for testing the central visual field.
Angiography
A diagnostic test in which the vascular system is examined. The ocular circulation can be highlighted by intravenous injection of either fluorescein, which particularly demonstrates the retinal circulation, or indocyanine green, to demonstrate the choroidal circulation.
Aniridia
Congenital absence of the iris.
Aniseikonia
A condition in which the image seen by one eye differs in size or shape from that seen by the other.
Anisocoria
Unequal pupillary size.
Anisometropia
Difference in refractive error of the eyes.
Anophthalmos
Absence of a true eyeball.
Anterior chamber
Space filled with aqueous bounded anteriorly by the cornea and posteriorly by the iris.
Aphakia
Absence of the crystalline lens.
Aqueous
Clear, watery fluid that fills the anterior and posterior chambers.
Asthenopia
Eye fatigue from muscular, environmental, or psychologic causes.
Astigmatism
Refractive error that prevents the light rays from coming to a point focus on the retina because of different degrees of refraction in the various meridians of the cornea or crystalline lens.
Axis
The meridian specifying the orientation of a cylindric lens.
Binocular vision
Ability of the eyes to focus on one object and then to fuse two images into one.
Biomicroscope
See Slitlamp.
Bitot's spots
Keratinization of the bulbar conjunctiva near the limbus, resulting in a raised spot—a feature of vitamin A deficiency.
Blepharitis
Inflammation of the eyelids.
Blepharochalasis
loose overhanging skin fold in upper lid.
Blepharoptosis (ptosis)
Drooping of the eyelid.
Blepharospasm
Involuntary spasm of the lids.
Blind spot
Blank area in the visual field, corresponding to the light rays that come to a focus on the optic nerve.
Blindness
In the USA, the usual definition of blindness is corrected visual acuity of 20/200 or less in the better eye, or a visual field of no more than 20 degrees in the better eye.
Botulinum toxin
Neurotoxin A of the bacterium Clostridium botulinum used in very small doses to produce temporary paralysis of the extraocular or facial muscles.
Bruch's membrane
membrane separating the pigment epithelium and choriod
Buphthalmos
Large eyeball in infantile glaucoma.
Canal of Schlemm
A circular modified venous structure in the anterior chamber angle that drains aqueous to the aqueous veins.
Canaliculus
Small tear drainage tube in inner aspect of upper and lower lids leading from the punctum to the common canaliculus and then to the tear sac.
Canthotomy
Usually implies lateral canthotomy—cutting of the lateral canthal tendon for the purpose of widening the palpebral fissure.
Canthus
The angle at either end of the eyelid aperture; specified as outer and inner.
Cataract
An opacity of the crystalline lens.
Cataract extraction
Removal of a cataract, either by removal of the lens complete with its capsule (intracapsular cataract extraction), or by removal of the lens contents after opening the capsule (extracapsular cataract extraction).
Chalazion
Granulomatous inflammation of a meibomian gland.
Chemosis
Conjunctival edema.
Choroid
The vascular middle coat between the retina and sclera.
Ciliary body
Portion of the uveal tract between the iris and the choroid. It consists of ciliary processes and the ciliary muscle.
Coloboma
Congenital cleft due to the failure of some portion of the eye or ocular adnexa to complete growth.
Color blindness
Diminished ability to perceive differences in color.
Concave lens
Lens having the power to diverge rays of light; also known as diverging, reducing, negative, or minus lens, denoted by the sign (–), used to correct myopia.
Cones and rods
Two kinds of retinal receptor cells. Cones are concerned with visual acuity and color discrimination; rods, with peripheral vision under decreased illumination.
Conjunctiva
Mucous membrane that lines the posterior aspect of the eyelids and covers the anterior sclera.
Convergence
The process of directing the visual axes of the eyes to a near point.
Convex lens
Lens having power to converge rays of light and to bring them to a focus; also known as converging, magnifying, or plus lens, denoted by the sign (+), used to correct hyperopia or presbyopia.
Cornea
Transparent portion of the outer coat of the eyeball forming the anterior wall of the anterior chamber.
Corneal contact lenses
Thin lenses that fit directly on the cornea.
Corneal graft (keratoplasty)
Operation to restore vision by replacing a section of opaque cornea with transparent cornea, either involving the full thickness of the cornea (penetrating keratoplasty) or only a superficial layer (lamellar keratoplasty). The donor cornea may be from the same human (autograft), another human (homograft), or another species (heterograft).
Cover test
A method of determining the presence and degree of phoria or tropia by covering one eye with an opaque object, thus eliminating fusion.
Cross cylinder
A specialized spherocylindrical lens used to measure astigmatism.
Crystalline lens
A transparent biconvex structure suspended in the eyeball between the aqueous and the vitreous. Its function is to bring rays of light to a focus on the retina. Accommodation is produced by variations in the magnitude of this effect. (Now usually called simply the lens.)
Cyclodestructive procedures
Surgical techniques to reduce aqueous production by destroying portions of the ciliary body in the treatment of intractable glaucoma, using cryotherapy (cyclocryotherapy), lasers (cyclophotocoagulation), or diathermy.
Cycloplegic
A drug that temporarily puts the ciliary muscle at rest, paralyzing accommodation.
Cylindrical lens
A segment of a cylinder the refractive power of which varies in different meridians, used to correct astigmatism.
Dacryocystitis
Infection of the lacrimal sac.
Dacryocystorhinostomy
A procedure by which a communication is made between the nasolacrimal duct and the nasal cavity to relieve an obstruction in the nasolacrimal duct, or sac.
Dark adaptation
The ability to adjust to decreased illumination.
Dermatochalasis
puffiness of skin in the upper lid with aging, commonly due to herniation of orbital fat.
Diopter
Unit of measurement of refractive power of lenses.
Diplopia (double vision)
Seeing one object as two.
Drusen
small round yellow spots just outside the pigment epithelium, a benign degenerative condition. When in the optic nerve head, drusen appear as bumpy tapioca-like excrescences, which should not be confused with papilledema.
Dry-eye syndrome
sirritation secondary to decreased tearing, as in Sjogrens syndrome; may be treated with ocular lubricants like methylcellulose and polyvinyl alcohol. Sometimes, vitamin A ointment may be useful.
E test
A system of testing visual acuity in illiterates, particularly preschool children.
Ectropion
Turning out of the eyelid.
Emmetropia
Absence of refractive error.
Endolaser
Application of laser from a probe inserted into the globe.
Endophthalmitis
Extensive intraocular infection.
Enophthalmos
Abnormal retrodisplacement of the eyeball.
Entropion
A turning inward of the eyelid.
Enucleation
Complete surgical removal of the eyeball.
Epicanthus
Congenital skin fold that overlies the inner canthus.
Epiphora
Tearing.
Episclerosis
inflammation of the connective tissue lying between sclra and conjunctiva.
Esophoria
A tendency of the eyes to be convergent.
Esotropia
A manifest inward deviation of one eye.
Evisceration
Removal of the contents of the eyeball.
Exenteration
Removal of the entire contents of the orbit, including the eyeball and lids.
Exophoria
A tendency of the eyes to be divergent.
Exophthalmos
Abnormal protrusion of the eyeball.
Exotropia
A manifest outward deviation of one eye.
Far point
The point at which the eye is focused when accommodation is completely relaxed.
Farsightedness
See Hyperopia.
Field of vision
The entire area that can be seen without shifting the gaze.
Floaters
Moving images in the visual field due to vitreous opacities.
Focus
A point to which rays of light are brought together to form an image; focal distance is the distance between a lens and its focal point.
Fornix
The junction of the palpebral and bulbar conjunctiva.
Fovea
Depression in the macula adapted for most acute vision.
Fundus
The posterior portion of the eye visible through an ophthalmoscope.
Fusion
Coordinating the images received by the two eyes into one image.
Glaucoma
Disease characterized by abnormally increased intraocular pressure, optic atrophy, and loss of visual field.
Goldmann perimeter
a refined device for potting visual field defects usuing lights of varying size and brightness.
Gonioscopy
A technique of examining the anterior chamber angle, utilizing a corneal contact lens, magnifying device, and light source.
Hemianopia
Blindness in one-half of the field of vision of one or both eyes.
Heterophoria (phoria)
A tendency of the eyes to be misaligned.
Heterotropia
See Strabismus.
Hippus
Exaggerated spontaneous rhythmic movements of the iris.
Hordeolum, external (sty)
Infection of the glands of Moll or Zeis.
Hordeolum, internal
Meibomian gland infection.
Hyperopia, hypermetropia (farsightedness)
A refractive error in which the focus of light rays from a distant object is behind the retina.
Hyperphoria
A tendency of one eye to deviate upward.
Hypertropia
A manifest upward deviation of one eye in relation to the other.
Hyphema
Blood in the anterior chamber.
Hypopyon
Pus in the anterior chamber.
Hypotony
Abnormally soft eye from any cause.
Injection
Congestion of blood vessels.
Iridectomy
Surgical excision of a sector of iris to form a direct communication between the anterior and posterior chambers.
Iris
Colored, annular membrane, suspended behind the cornea and immediately in front of the lens.
Ishihara color plates
A test for color vision based on the ability to see patterns in a series of pseudoisochromatic multicolored charts.
Isopter
An object for testing visual fields. Isopters can be of different colors and sizes so as to differentiate relative visual field defects from absolute defects.
Jaeger test
A test for near vision using lines of various sizes of type.
Keratic precipitate (KP)
Accumulation of inflammatory cells on the posterior cornea in uveitis.
Keratitis
Inflammation of the cornea.
Keratoconus
Cone-shaped deformity of the cornea.
Keratomalacia
Corneal softening, usually associated with avitaminosis A.
Keratometer
An instrument for measuring the curvature of the cornea, used in fitting contact lenses.
Keratopathy, bullous
Swelling of the cornea with painful blisters in the epithelium due to excessive corneal hydration.
Keratoplasty
See Corneal graft.
Keratoprosthesis
Plastic implant surgically placed in an opaque cornea to achieve an area of optical clarity.
Keratotomy
An incision in the cornea. Radial keratotomy is a procedure in which radial incisions are made in the cornea to correct myopia.
Koeppe nodule
Accumulation of inflammatory cells on the iris in uveitis.
Lacrimal sac
The dilated area at the junction of the nasolacrimal duct and the canaliculi.
Laser in situ keratomileusis (LASIK)
Corneal excimer laser ablation under a stromal flap to treat refractive error.
Laser subepithelial keratomileusis (LASEK)
Corneal excimer laser ablation under an epithelial flap to treat refractive error.
Lens
A refractive medium having one or both surfaces curved. (See also Crystalline lens.)
Lensometer
An instrument for measuring the power of optical lenses.
Limbus
Junction of the cornea and sclera.
Limepia retinalis
yellow-cream coloring of retinal vessels due to marketdly excessive lipids in the blood.
Macula lutea
The small avascular area of the retina surrounding the fovea, containing yellow xanthophyll pigment.
Maddox rod
A red lens composed of parallel series of strong cylinders through which a point of light is viewed as a red line—used to measure phorias.
Magnification
The ratio of the size of an image to the size of its object.
Megalocornea
Abnormally large cornea (>13 mm in diameter).
Metamorphopsia
Wavy distortion of vision.
Microphthalmos
Abnormally small eye with abnormal function (see Nanophthalmos).
Miotic
A drug causing pupillary constriction.
Mydriatic
A drug causing pupillary dilation.
Myopia (nearsightedness)
A refractive error in which the focus for light rays from a distant object is anterior to the retina.
Myokymia
twitching of eyelids, a benign transient condition possibly related to fatigue or tension; occures unilaterally.
Nanophthalmos
Abnormally small eye with normal function (see Microphthalmos).
Near point
The point at which the eye is focused when accommodation is fully active.
Nearsightedness
See Myopia.
Nystagmus
An involuntary oscillation of the eyeball that may be horizontal, vertical, torsional, or mixed.
Ophthalmia neonatorum
Conjunctivitis in the newborn.
Ophthalmoscope
An instrument with a special illumination system for viewing the inner eye, particularly the retina and associated structures.
Optic atrophy
Optic nerve degeneration.
Optic disk
Ophthalmoscopically visible portion of the optic nerve.
Optic nerve
The nerve that carries visual impulses from the retina to the brain.
Orbital cellulitis
Inflammation of the tissues surrounding the eye.
Orthoptics
The study and treatment of defects of binocular visual function or of the muscles controlling movement of the eyeballs.
Oscillopsia
The subjective illusion of movement of objects that occurs with some types of nystagmus.
Palpebral
Pertaining to the eyelid.
Pannus
Infiltration of the cornea with blood vessels.
Panophthalmitis
Inflammation of the entire eyeball.
Papilledema
Swelling of the optic disk due to raised intracranial pressure.
Papillitis
Optic nerve head inflammation.
Partially seeing child
For educational purposes, a partially seeing child is one who has a corrected visual acuity of 20/70 or less in the better eye.
Perimeter
An instrument for measuring the field of vision.
Peripheral (laser) iridoplasty
Procedure to contract the iris stroma by application of usually argon laser burns to the peripheral iris.
Peripheral (laser) iridotomy
Formation of a hole in the iris to form a direct communication between the anterior and posterior chambers, usually performed with the neodymium
Peripheral vision
Ability to perceive the presence, motion, or color of objects outside of the direct line of vision.
Phacoemulsification and phacofragmentation
Techniques of extracapsular cataract extraction in which the nucleus of the lens is disrupted into small fragments by ultrasonic vibrations, thus allowing aspiration of all the lens matter through a small wound.
Phakomatoses
A group of hereditary diseases characterized by the presence of spots, cysts, and tumors in various parts of the body—eg, neurofibromatosis, Von Hippel-Lindau disease, tuberous sclerosis.
Phlyctenule
Localized lymphocytic infiltration of the conjunctiva.
Phoria
See Heterophoria.
Photocoagulation
Thermal damage to tissues due to absorption of high levels of light (including laser) energy.
Photodecomposition
Tissue damage by direct separation of chemical bonds by absorption of very short wavelength ultraviolet light (eg, from excimer lasers).
Photodisruption
Tissue damage produced by the breakdown of "plasma," which is a state of ionization created by spot focusing a high-energy laser source (eg, neodymium
Photodynamic therapy (PDT)
Retinal laser augmented by intravenous injection of a dye (verteporfin).
Photophobia
Abnormal sensitivity to light.
Photopsia
Appearance of sparks or flashes within the eye due to retinal irritation.
Photorefractive keratectomy (PRK)
Surface corneal excimer laser ablation to treat refractive error.
Phototherapeutic keratectomy (PTK)
Surface corneal excimer ablation to treat anterior corneal disorders, eg, recurrent corneal erosions.
Phthisis bulbi
Atrophy of the eyeball with blindness and decreased intraocular pressure, due to end-stage intraocular disease.
Pinguecula
A benign yellowish, soft, slightly elevated area found nasal or lateral to the cornea, typically nasal.
Placido's disk
A disk with concentric rings used to determine the regularity of the cornea by observing the ring's reflection on the corneal surface.
Poliosis
Depigmentation of the eyelashes.
Posterior chamber
Space filled with aqueous anterior to the lens and posterior to the iris.
Presbyopia ("old sight")
Physiologically blurred near vision, commonly evident soon after age 40, due to reduction in the power of accommodation.
Prism
A wedge of transparent material that deviates light rays without changing their focus.
Prism diopter
The unit of prism power.
Pseudoisochromatic charts
Charts with colored dots of various hues and shades forming numbers, letters, or patterns, used for testing color discrimination.
Pseudophakia
Presence of an artificial intraocular lens implant following cataract extraction.
Pterygium
A triangular growth of tissue that extends from the conjunctiva over the cornea.
Ptosis
Drooping of the eyelid.
Puncta
External orifices of the upper and lower canaliculi.
Pupil
The round hole in the center of the iris that corresponds to the lens aperture in a camera.
Refraction
(1) Deviation in the course of rays of light in passing from one transparent medium into another of different density. (2) Determination of refractive errors of the eye and correction by lenses.
Refractive error (ametropia)
An optical defect that prevents light rays from being brought to a single focus on the retina.
Refractive index
The ratio of the speed of light in a vacuum to the speed of light in a given material.
Refractive keratoplasty
Surgery of the cornea to correct refractive errors.
Refractive media
The transparent parts of the eye having refractive power.
Retina
Innermost coat of the eye, consisting of the sensory retina, which is composed of light-sensitive neural elements connecting to other neural cells, and the retinal pigment epithelium.
Retinal detachment
A separation of the neurosensory retina from the pigment epithelium and choroid.
Retinitis pigmentosa
A hereditary degeneration of the retina.
Retinoscope
An instrument specially designed for refracting an eye objectively.
Rods
See Cones and rods.
Rubiosis
growth of abnormal blood vessels on the iris, signifying retinal nonperfusion.
Sclera
The white part of the eye—a tough covering that, with the cornea, forms the external protective coat of the eye.
Scleral spur
The protrusion of sclera into the anterior chamber angle.
Scotoma
A blind or partially blind area in the visual field.
Slitlamp
A combination light and microscope for examination of the eye.
Snellen chart
Used for testing central visual acuity. It consists of lines of letters or numbers, in graded sizes drawn to Snellen measurements.
Sphincterotomy
A surgical incision of the iris sphincter muscle.
Staphyloma
A thinned part of the coat of the eye, causing protrusion.
Strabismus (heterotropia, tropia)
Misalignment of the eyes.
Sty
See Hordeolum, external.
Symblepharon
Adhesions between the bulbar and palpebral conjunctiva.
Sympathetic ophthalmia
Inflammation in both eyes following trauma.
Synechia
Adhesion of the iris to the cornea (anterior synechia) or lens (posterior synechia).
Syneresis
A degenerative process within a gel, involving a drawing together of particles of the dispersed medium, separation of the medium, and shrinkage of the gel. Specifically applied to the vitreous.
Tarsorrhaphy
A surgical procedure by which the upper and lower lid margins are united.
Tonometer
An instrument for measuring intraocular pressure.
Trabeculectomy
Surgical procedure for creating an additional aqueous drainage channel in the treatment of glaucoma.
Trabeculoplasty
Laser photocoagulation of the trabecular meshwork in the treatment of open-angle glaucoma.
Trachoma
A serious form of infectious keratoconjunctivitis.
Transpupillary thermotherapy
Diffuse treatment of fundal lesions with low-energy diode laser.
Trichiasis
Inversion and rubbing of the eyelashes against the globe.
Tropia
See Strabismus.
Uvea (uveal tract)
The iris, ciliary body, and choroid.
Uveitis
Inflammation of one or all portions of the uveal tract.
Visual acuity
Measure of the optical resolution of the eye.
Visual axis
An imaginary line that connects a point in space (point of fixation) with the fovea centralis.
Vitiligo
Localized patchy decrease or absence of pigment on the skin.
Vitrectomy
Surgical removal of the vitreous to clear vitreous hemorrhage, allow treatment of retinal detachment or retinal vascular disease, or treat intraocular infection or inflammation.
Vitreous
Transparent, colorless mass of soft, gelatinous material filling the eyeball behind the crystalline lens.
Xerosis
Drying of tissues lining the anterior surface of the eye.
Xerophthalmia
Drying and clouding of the cornea wiht vitamin A deficiency.
Zonule
The numerous fine tissue strands that stretch from the ciliary processes to the crystalline lens equator (360 degrees) and hold the lens in place.
Zonulolysis
Lysis of the zonule, as with chymotrypsin, to facilitate removal of the lens in intracapsular cataract surgery.