Term
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Definition
Adjustments in focal power of the eye necessary to maintain a clearly focused image on the retina as an object moves closer to or farther from the eye
largely accomplished by changes in shape or position of the lens through action of the ciliary muscle (additional mechanisms may be involved in some species) |
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Definition
| periocular structures, consisting of orbit, orbital contents, eyelids, nasolacrimal system, conjunctiva and third eyelid |
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Definition
| failure of development of an organ/tissue |
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Definition
congenital and inherited absence of melanin.
In ocular structures, this is most striking in the iris (pink) and fundus(choroid is easily seen) |
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Definition
| absence of hair from an area where it is normally found |
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Definition
| complete blindness without overt ocular cause |
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Definition
| reduced vision without overt ocular cause |
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Definition
glaucoma due to mechanical obstruction of the iridocorneal angle that prevents aqueous humor form reaching the trabecular meshwork
aka narrow-angle/closed-angle glaucoma |
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Definition
inherited congenital complete absence of iris
extremely rare as usually some of the iris root is present |
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Definition
| disparity in pupil size between the two eyes |
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Definition
fusion of the eyelid margins
physiologic for the first 10 days in puppies and kittens |
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Definition
complete absence of the eye
extremely rare as usually some of the ocular tissues are present
(microphthalmos is more common) |
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Term
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Definition
space bounded anteriorly by the cornea and posteriorly by the iris and anterior lens
contains aqueous humor |
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Term
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Definition
collective term for those parts of the eye anterior to the vitreous
consisting of: lens, ciliary body, iris (and pupil, anterior chamber, cornea, anterior sclera, conjunctiva |
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Term
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Definition
inflammation of the ciliary body (cyclitis) and iris (iritis)
aka iridocyclitis |
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Definition
absence of the lens
occurs extremely rarely as an inherited
(extreme microphakia is more likely) |
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Term
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Definition
crescent-shaped space created between the equator of a dislocated (luxated or subluxated) lens and dilated pupil
pathognomonic for lens dislocation |
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Term
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Definition
Tyndall effect seen when a focal beam of light passes through aqueous humor containing excessive protein and/or cells (plasmoid aqueous)
pathognomonic for disruption of the blood-aqueous barrior |
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Term
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Definition
clear fluid made by the ciliary body epithelium
released into the posterior chamber, fills the anterior chamber and egresses through the iridocorneal angle
responsible (in part) for meeting the metabolic needs of the avascular lens and cornea |
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Term
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Definition
retinal region with high density of cone photoreceptors and ganglion cells that is lateral to the optic nerve head in cats
important for visual acuity |
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Term
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Definition
fixed opacities composed of a calcium-lipid complex and occuring in an otherwise normal vitreous body
relatively common in older animals |
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Term
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Definition
| optical condition in which light coming from a single point in the environment is not focused to a single point on the retina, usually due to irregularities in the corneal curvature |
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Term
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Definition
| the cornea is shaped more like a football than like part of a sphere and the resulting image is distorted but in a somewhat predictable fashion |
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Term
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Definition
the cornea is very irregular and light is not uniformly brought into focus on the retina
usually due to corneal disease or injury |
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Term
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Definition
mass of glial cells surrounding the hyaloid artery in the center of the opitc disc
pathologic in most species
seen commonly in ruminants |
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Term
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Definition
the ability to use the two eyes simultaneously to focus on the same object
fusion of these two separate images by the brain allows for stereopsis and a further improvement in the ability to detect depth |
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Definition
| inflammation of the upper or lower eyelids |
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Definition
| plastic surgery of the eyelids |
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Definition
| spasm of the orbicularis oculi muscle resulting in eyelid closure |
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Term
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Definition
physiologic barrier formed by the iris and ciliary body vascular endothelium and the ciliary epithelium that limits movement of plasma components into the aqueous humor
part of the blood-ocular barrier |
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Term
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Definition
physiologic barrier formed by the vascular endothelium and some intraocular epithelial tissues that limits movement of plasma components into the eye
composed of: the blood-aqueous barrier anteriorly and the blood-retinal barrier posteriorly |
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Term
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Definition
physiologic barrier formed by the retinal vascular endothelium and the retinal pigment epithelium that limits movement of plasma components into the retina and vitreous
part of the blood-ocular barrier |
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Definition
a large fluid-filled vesicle or blister
usually due to corneal edema |
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Definition
| disease of the cornea associated with bullae formation |
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Definition
| enlargement of the eye due to glaucoma |
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Definition
| small epithelium-lined tube at at the inner aspect of the upper and lower lids, leading from the nasolacrimal punctum to the lacrimal sac |
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Definition
| plastic surgery on the medial or lateral canthus |
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Definition
| surgical incision of (usually the lateral) canthus to improve surgical visualization or access |
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Term
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Definition
| the angle at the medial and lateral ends of the palpebral fissure where the upper and lower eyelids join |
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Definition
| a small piece of skin at the medial canthus from which hairs often protrude |
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Term
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Definition
| opacity of the lens and/or lens capsule |
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Term
| Central progressive retinal atrophy |
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Definition
a group of disorders in which retinal degeneration is accompanied by numerous, small, pigmentlike foci over the tapetal fundus
the primary defect is in the retinal pigment epithelium, whereas in generalized progressive retinal atrophy (PRA) the defect is in the photoreceptors
aka retinal pigment epithelial dystrophy |
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Term
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Definition
| lipogranuloma of a tarsal (meibomian) gland due to impaction of secretions and sometimes rupture into the surrounding eyelid tissue |
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Definition
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Definition
| lay term for prolapsed gland of the third eyelid |
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Definition
| inflammation of the choroid and retina in which choroiditis is the dominant and presumed initiating factor |
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Term
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Definition
the posterior aspect of the uveal tract immediately external to the retina
responsible for nutrition of the outer retinal layers |
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Term
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Definition
inflammation of the choroid
usually caused by or causing associated retinitis resulting in retinochoroidiits or chorioretinitis |
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Term
| Chronic immune-mediated karato-conjunctivitis syndrome (CIKS) |
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Definition
characteristic immune-mediated disease of the cornea and conjuntiva of dogs
aka chronic superficial keratitis (CSK), pannus, and Uberreiter's syndrome |
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Term
| Chronic superficial keratitis (CSK) |
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Definition
a general descriptive pathologic term that is sometimes used to describe a characteristic immune-mediated disease of the cornea and conjunctiva of dogs
aka pannus, chronic immune-mediated keratoconjunctivitis syndrome (CIKS), and Uberreiter's syndrome |
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Term
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Definition
part of the uveal tract between the iris adn the choroid
consists of the ciliary processes that produce aqueous humor and the ciliary muscle responsible for accommodation and iridocorneal angle/trabecular meshwork opening |
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Term
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Definition
| poorly defined transition point between the posterior surface of the iris and the anterior surface of the ciliary body |
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Definition
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Definition
| glaucoma associated with apposition of the peripheral iris to the peripheral cornea |
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Definition
| inherited developmental defect of collies and some other breeds characterized by choroidal hypoplasia, with or without colobromas, and retinal detachement |
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Definition
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Term
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Definition
congenital absence of any ocular tissue
commonly affected tissues are eyelid, iris, choroid and optic disc
usually present as a gap, hole, fissure or notch-shaped defect |
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Term
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Definition
| defects lying near the 6 o'clock position within the eye and due to failed closure of the fetal fissure |
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Term
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Definition
| defects occurring in areas other than the fetal fissure |
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Term
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Definition
| retinal photoreceptor adapted for vision in bright light, for color vision, and for fine visual acuity |
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