ABO STUDY GUIDE EXAM PRACTICE QUESTIONS AND ANSWERS LATEST UPDATED

ABO STUDY GUIDE EXAM PRACTICE QUESTIONS AND ANSWERS LATEST UPDATED vitreous humor - CORRECT ANSWER-the transparent, colorless mass of soft, gelatinous material which fills the eyeball behind the lens: 1.42 - CORRECT ANSWER-the index of refraction of the crystalline lens is: 1.37 - CORRECT ANSWER-the cornea has an index of refraction of: 6 - CORRECT ANSWER-the extra-ocular muscles are inserted into the sclera and serve to rotate the eye in all possible directions. There are _______________ of these muscles in each eye. sclera and cornea - CORRECT ANSWER-the fibrous tunic is comprised of the: in the brain - CORRECT ANSWER-fusion occurs: the ciliary body - CORRECT ANSWER-the aqueous fluid is continually being manufactured by: accommodation - CORRECT ANSWER-the ability of the eye to bring objects if varying distances to focus on the retina is known as: myopia - CORRECT ANSWER-when accommodation is at rest, rays of light from a distant source come to focus in front of the retina. this condition is known as: hyperopia - CORRECT ANSWER-when accommodation is at rest, rays of light from a distant source come to focus behind the retina. this condition is known as: optic nerve - CORRECT ANSWER-impulses are carried from the retina to the brain along the: the pupils constrict, the eyes converge, & the crystalline lens accommodates - CORRECT ANSWER-while reading, or performing other near vision tasks: forvea centralis - CORRECT ANSWER-that area of the retina capable if perceiving the greatest amount of details is: 43 diopters - CORRECT ANSWER-the average cornea has a refractive power of approximately: the epithelium - CORRECT ANSWER-that layer if the cornea which is highly regenerative is: rods - CORRECT ANSWER-Night vision is chiefly a function of the: esophoria - CORRECT ANSWER-A tendency of the visual axis to deviate inward when the eyes are in a position of the rest is known as: hyperopic - CORRECT ANSWER-A "farsighted" eye is one that is: diplopia - CORRECT ANSWER-The term used to indicate "double vision" is: presbyopia - CORRECT ANSWER-The condition in which the ability to accommodate for near vision ecomes inadequate because of loss of elasticity of the crystalline lens is called: amblyopia - CORRECT ANSWER-When there is loss of vision without any apparent disease of the eye, it is known as: astigmatism - CORRECT ANSWER-A refractive error in which the rays of light do not come to a single point of focus is called: cataract - CORRECT ANSWER-The condition in which the crystalline lens of the eye gradually loses its transparency with consequent loss of visual acuity is known as: glaucoma - CORRECT ANSWER-An ocular disease as its primary characteristic a sustained increase in intraocular pressure. posterior chamber - CORRECT ANSWER-The space between the back of the iris and the front of the lens which is filled with aqueous is the: hyperphoria - CORRECT ANSWER-A tendency of one eye to deviate upward is: cones - CORRECT ANSWER-The photosensitive receptors of the retina which are responsible for sharp visual acuity and color perception are the: the stroma - CORRECT ANSWER-The layer of the cornea which comprises ninety percent of its thickness is: anisometropia - CORRECT ANSWER-A condition in which the refractive error of one eye significantly differs from that of the other and where both eyes have the same sign (i.e. both eyes are myopic or myperopic) is known as: compound hyperopic astigmatism - CORRECT ANSWER-The refractive error which results in two points of focus falling behind the retina is: irregular astigmatism - CORRECT ANSWER-The refractive condition caused by a damaged cornea so that rays of light come to many focal points on the retina is known as: IN - CORRECT ANSWER-When the optical centers of a pair of plus lenses are positioned narrower than the PD, it produces prism base... OUT - CORRECT ANSWER-When the optical centers of a pair of minus lenses are positioned narrower than the PD, it produces prism base... DOWN - CORRECT ANSWER-When a patient looks through a plus lens above the optical center, it produces prism base... DOWN - CORRECT ANSWER-When a patient looks through a minus lens below the optical center, it produces prism base... 1.0 - CORRECT ANSWER-How much prism is induced 5 mm away from the optical center of a +2.00 diopter lens? 0.25 - CORRECT ANSWER-How much prism is induced 10 mm away from the optical center of a -0.25 diopter lens? 3.2 - CORRECT ANSWER-How much prism is induced 2 mm away from the optical center of a +16.00 diopter lens? 0.9 BASE OUT - CORRECT ANSWER-came in with the optical centers positioned 61 mm apart. The work order indicates the patient's PD measures 64 mm and the prescription calls fro a -3.00 spheres in each eye. How much total prism is induced and in which direction is the base? 1.45 BASE OUT - CORRECT ANSWER-A patient's prescription calls for OD: +4.75 OS: +2.50. The optical centers of the finished spectacles are found to be positioned 4 mm too wide. How much total prism is induced and in which direction is the base? air - CORRECT ANSWER-the index of refraction is lowest in: toward the base - CORRECT ANSWER-when parallel rays of light enter prism, the light is deviated: 39.37 - CORRECT ANSWER-one meter is equal to _______ inches. 200 - CORRECT ANSWER-two meters equal ______ centimeters. dividing the speed of light in air by the speed of light in the material. - CORRECT ANSWER-the index of refraction of any given transparent material can be determined by: 186,000 miles per second - CORRECT ANSWER-the speed of light in air is approximately: refraction - CORRECT ANSWER-when the direction of light is deviated in the course of the passing from one transparent medium to another it is known: 1.70 - CORRECT ANSWER-light travels through a certain transparent medium at the rate of approximately 109,412 miles per sec. the index of refraction of that medium is: 1 prism diopter - CORRECT ANSWER-if a prism can displace an image one centimeter at a distance of one meter, it is said to have a power of: wavelength - CORRECT ANSWER-the distance between the crest of two waves is called the: -20 cm - CORRECT ANSWER-the focal length of a -5.00 diopter lens is: base up prism - CORRECT ANSWER-decentering a plus lens upward will result in: corpuscular - CORRECT ANSWER-the _________________ theory describes light as traveling through space in minute bursts of energy. +0.50 diopters - CORRECT ANSWER-if a converging lens has a focal length of +2 meters, its power is: 390 and 750 nanometers - CORRECT ANSWER-visible light is part of the overall spectrum of radiant energy. although the range of wavelengths of which are perceived as visible light can vary with the individual, it is generally understood to lie between: power of the lens X the decentration in mm / 10 - CORRECT ANSWER-prentice's rule states that the amount of induced prism is equal to: 0.6 prism diopters base in - CORRECT ANSWER-a pair of spectacles were ordered with a prescription of -2.00D in each eye and a PD of 63 mm. they were received from the lab with the optical centers set 66mm apart. how much total prism was induced and in which direction is the base? 0.8 prism diopters base out - CORRECT ANSWER-a pair of +4.00 spectacle lenses were ordered from the laboratory with a PD of 59 mm. when these lenses were verified, it was determined that the optical centers were positioned 4mm too wide. how much prism was induced in each eye and in which direction is the base?