Glossary Flashcards
Accommodation
Adjustment by the eye for focusing clearly on near targets, which is accomplished by changing the shape of the crystalline lens through the action of the ciliary muscle.
Anterior chamber
The aqueous-filled space in the forward portion of the eye, bounded in the front by the cornea and behind the iris.
Aqueous
Clear, watery fluid which fills the anterior chamber of the eye.
Blind spot
The natural sightless area of the visual field generated by the lack of photoreceptors where the optic nerve enters the eye.
Cataract
A clouding of the crystalline lens of the eye or its capsule, or both, with consequent loss of visual acuity.
Choroid
The vascular, intermediate layer of the eye, lying between the retina and the sclera, which furnishes nourishment to the other parts of the eyeball.
Ciliary body
A portion of the vascular layer between the iris and the choroid, which consists of ciliary processes and ciliary muscle
Conjunctiva
Mucous membrane which lines the eyelids and covers the front part of the eyeball
Contact lenses
Lenses that are placed on the corneal surface or sclera. They have either an optical, therapeutic, or cosmetic purpose
Cornea
The transparent, done-shaped tissue covering the iris and the pupil. The front “window” of the eye, approximately 12mm in diameter, responsible for approximately 2/3 of the refractive power of the eye
Crystalline lens
The transparent lens which is suspended inside the eye immediately behind the iris. It is responsible for 1/3 of the refractive power of the eye.
Fornix
The pocket formed where the bulbar conjunctiva meets the palpebral conjunctiva
Fundus
The back of the eye including the retina, optic nerve, macula and fovea
Iris
Coloured, circular muscle tissue behind the cornea and immediately in front of the crystalline lens. The iris regulates the amount of light entering the eye by hanging the size of the pupil.
Ophthalmologist
A medical doctor who specializes in diagnosis and treatment of defects and diseases of the eye, performs surgery when necessary or prescribing other types of treatment.