Flashcards in Glossary Deck (25)
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.
The aqueous-filled space in the forward portion of the eye, bounded in the front by the cornea and behind the iris.
Clear, watery fluid which fills the anterior chamber of the eye.
The natural sightless area of the visual field generated by the lack of photoreceptors where the optic nerve enters the eye.
A clouding of the crystalline lens of the eye or its capsule, or both, with consequent loss of visual acuity.
The vascular, intermediate layer of the eye, lying between the retina and the sclera, which furnishes nourishment to the other parts of the eyeball.
A portion of the vascular layer between the iris and the choroid, which consists of ciliary processes and ciliary muscle
Mucous membrane which lines the eyelids and covers the front part of the eyeball
Lenses that are placed on the corneal surface or sclera. They have either an optical, therapeutic, or cosmetic purpose
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
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.
The pocket formed where the bulbar conjunctiva meets the palpebral conjunctiva
The back of the eye including the retina, optic nerve, macula and fovea
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.
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.
Head of the optic nerve in the eyeball where the retinal nerve fibres leave the eye; responsible for physiological blind spot.
One who dispenses frames and lenses, based on a prescription written by an optometrist or ophthalmologist; grinds lenses, fits them into frames, and adjusts the frame to wearer
The nerve which carries visual messages from the retina to the brain
A primary health care provider specializing in diagnosing and treating diseases and optical disorders of the eye, prescribing lenses, vision training, medicines and other treatments.
The narrow space between the back of the iris and the front surface of the crystalline lens, bounded by the ciliary body and filled with aqueous.
A condition common after age forty in which gradual lessening of the eye's power of accommodation causes difficulty seeing near objects
A thin membrane lining the back of the eye where the optical images are received. The retina converts these images into electronic impulses and transmits them to the brain along the optic nerve
Rods and cones
These are two types of nerve cells which form a layer of the retina and act as light receiving media. Cones are concerned with visual acuity and colour discrimination; rods with motion and vision at low degrees of illumination (night vision)
The white part of the eye - a tough covering which, with the cornea, forms the external protective coat of the eye.