Optometry Terms (Accurate)

anterior chamber correct answers fluid-filled space inside the eye between the cornea and the iris. aqueous humor correct answers clear, watery fluid that fills the space between the cornea and the front of the vitreous, bathing and nourishing the lens, iris, cornea. Maintains eye (intraocular) pressure. binocular correct answers using both eyes at the same time. blind spot correct answers sightless area within the visual field of a normal eye. Caused by absence of photoreceptors where the optic nerve enters the eye. blood vessel correct answers an artery, a vein, or a capillary, through which blood circulates. choroid correct answers layer of large blood vessels lying between the retina and the sclera which provide nourishment to the retina color blindness correct answers inability to distinguish between some colors; most common is difficulty with shades of red and green. Usually hereditary. cone correct answers a photoreceptor used for color vision and which provides sharp visual acuity conjunctiva correct answers transparent mucus membrane covering the outer surface of the eyeball (except for cornea). cornea correct answers transparent front part of eye that covers iris, pupil, anterior chamber and provides most of an eye's optical power to help bring rays of light to a focus on the retina. crystalline lens correct answers transparent oval tissue that also helps bring rays of light into a focus on the retina. depth perception correct answers ability to see in 3 dimensions diplopia correct answers double vision electromagnetic radiation correct answers energy that travels and spreads as it goes. Examples are visible light, radio waves, microwaves, infrared, ultraviolet light, X-rays, and gamma rays esotropia correct answers condition in which eye points inward towards the nose (cross-eyed) exotropia correct answers condition in which eye points outward extraocular muscles correct answers six muscles that move the eyeball