ABO exam Exam Questions And Correct Answers, With Complete Verified Solution. 100% Correct.

ABO exam Exam Questions And Correct Answers, With Complete Verified Solution. 100% Correct. vitreous humor the transparent, colorless mass of soft, gelatinous material which fills the eyeball behind the lens: 1.42 the index of refraction of the crystalline lens is: 1.37 the cornea has an index of refraction of: 6 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 the fibrous tunic is comprised of the: in the brain fusion occurs: the ciliary body the aqueous fluid is continually being manufactured by: accommodation the ability of the eye to bring objects if varying distances to focus on the retina is known as: myopia 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 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 impulses are carried from the retina to the brain along the: the pupils constrict, the eyes converge, & the crystalline lens accommodates while reading, or performing other near vision tasks: forvea centralis that area of the retina capable if perceiving the greatest amount of details is: 43 diopters the average cornea has a refractive power of approximately: the epithelium that layer if the cornea which is highly regenerative is: rods Night vision is chiefly a function of the: esophoria A tendency of the visual axis to deviate inward when the eyes are in a position of the rest is known as: hyperopic A "farsighted" eye is one that is: diplopia The term used to indicate "double vision" is: presbyopia 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 When there is loss of vision without any apparent disease of the eye, it is known as: astigmatism A refractive error in which the rays of light do not come to a single point of focus is called: cataract The condition in which the crystalline lens of the eye gradually loses its transparency with consequent loss of visual acuity is known as: glaucoma An ocular disease as its primary characteristic a sustained increase in intraocular pressure. posterior chamber The space between the back of the iris and the front of the lens which is filled with aqueous is the: hyperphoria A tendency of one eye to deviate upward is: cones The photosensitive receptors of the retina which are responsible for sharp visual acuity and color perception are the: the stroma The layer of the cornea which comprises ninety percent of its thickness is: anisometropia 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 The refractive error which results in two points of focus falling behind the retina is: irregular astigmatism 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 When the optical centers of a pair of plus lenses are positioned narrower than the PD, it produces prism base... OUT When the optical centers of a pair of minus lenses are positioned narrower than the PD, it produces prism base... DOWN When a patient looks through a plus lens above the optical center, it produces prism base... DOWN When a patient looks through a minus lens below the optical center, it produces prism base... 1.0 How much prism is induced 5 mm away from the optical center of a +2.00 diopter lens? 0.25 How much prism is induced 10 mm away from the optical center of a -0.25 diopter lens? 3.2 How much prism is induced 2 mm away from the optical center of a +16.00 diopter lens? 0.9 BASE OUT 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 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 the index of refraction is lowest in: toward the base when parallel rays of light enter prism, the light is deviated: 39.37 one meter is equal to _______ inches. 200 two meters equal ______ centimeters. dividing the speed of light in air by the speed of light in the material. the index of refraction of any given transparent material can be determined by: 186,000 miles per second the speed of light in air is approximately: refraction when the direction of light is deviated in the course of the passing from one transparent medium to another it is known: 1.70 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 if a prism can displace an image one centimeter at a distance of one meter, it is said to have a power of: wavelength the distance between the crest of two waves is called the: -20 cm the focal length of a -5.00 diopter lens is: base up prism decentering a plus lens upward will result in: corpuscular the _________________ theory describes light as traveling through space in minute bursts of energy. +0.50 diopters if a converging lens has a focal length of +2 meters, its power is: 390 and 750 nanometers 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 prentice's rule states that the amount of induced prism is equal to: 0.6 prism diopters base in 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 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? virtual a diverging lens produces a _______ image. +100 cm the focal length of a +1.00 diopter lens is: diverging rays emanating from a point source of light are said to be: push the front out more if the pad arms are lengthened, this adjustment will: half round the plier best used for adjustment of rocking pads is: 13mm the standard distance between the segments in fused double segment multifocals in most cases is: a center piece with lens bars connecting the endpieces and temples a semi-rimless mounting consists of: 1.70 hilite lenses have a refractive index of: measure lens base curve most commonly, opticians use a Geneva lens measure to: CR-39 plastic lenses are made of a hard resin material known as: plus power a hyperope always has in his prescription the following kind of power: decrease pantoscopic tilt of the eyewires touch the cheeks, the adjustment to take care if this condition would be: intermediate if the pupillary distance is measured while the patient is focusing on a point 30 inches in front of his eyes, the PD measured is known as the _______PD phoria tendency of an eye to deviate from its normal position is called: meniscus lens a lens having one concave and one convex surface is called a: the myope the type of patient often bothered by specular images is: upper lid a ptosis crutch is used to give support to_____________ far point of the eye an ophthalmic correction from an ametrope is to focus parallel incident light rays at the: cataract lenses aspheric lens surfaces are most commonly used with: spherical most aspheric surfaces are: electrician which of the following occupations would be best suited with double segment lens most minus power a slab off should be ground in the lens which was the: aviator shape, frame PD larger than patient PD when selecting a frame for a potential progressive power lens candidate, avoid the following: +100 + 0.50 x 180 a pair of crossed cylinders, +100 x 90 and +150 x 180 would produce a power of: bottom edge of the pupil it is " generally" accepted procedure to fit the top of the trifocal segment to the: curving temples around the head bowing temples is an expression referring to: reticle the prism measurement indicator found in a vertometer or lensometer is called the: match image sizes the main reason for the use of Iseikonic lenses is to: the bottoms of the eyewire are out further than the top when a frame is said to have retroscopic tilt, the following condition is meant: chromatic aberration discomfort a high dispersion radio such as in flint glass can cause is called: meridian powers of a lens the optical cross is a graphic representation used to show the: add power which of the following areas is not a factor in determining vertical imbalance? front curve and index of refraction To determine the power of a thin lens in air, it is necessary to consider: 1.530 A standard lens measure is calibrated for an index of refraction of: -4.25 D A +1.75 diopter lens fabricated with a +6.00 base curve will require a back curve of: lens power in the principal meridians Toric transposition is used determine: compound hyperopic astigmatism A patient presents you with a prescription reading +2.75 - 1.00 x 180 in each eye. The refractive anomaly indicated by this Rx is: Increased the useful area of the lens Corrected curve lenses are designed to: Flint glass The following lenses are all made with the same radius of curvature on the front surface. Which of these materials will yield the greatest front surface power? 1.0 prism diopters base in Rx: 2.50 - 0.50 x 180 +2.50 sph PD = 67 During final inspection, it was determined that the optical centers of the lenses were placed 63 mm apart. How much total prism will this produce, and in whihc direction is the base? 0.50 prism diopters base out If the Rx -3.00 + 0.50 x 90 is decentered 2mm too much, how much prism will be created, and in which direction is the base? none Rx +2.00 -4.00 x 45 how much prism will be created if the optical center of this lens is received 5mm too wide? flatter as a corrected curve lens increases in minus power, the base curve tends to become gradually: steeper as the radius of curvature of a spherical surface increases in length, the curve becomes gradually: steeper as corrected curve lens increases in plus power, the base curve tends to become gradually___________________. steeper as the radius of curvature of a spherical surface decreases in length, its curve becomes gradually: simple myopic astigmatism Rx: plano -2.00 x 180. which of the following refractive conditions is this lens designed to correct? mixed astigmatism Rx: +0.50 -0.75 x 10 which of the following conditions is this lens designed to correct? both cylindrical and spherical surfaces compound ophthalmic lenses usually consist of: no cylinder power the power of a cylinder along its axis contains: 2 meters when the surfaces of a 1.530 index glass lens are measured with a lens clock, the front curve reads +6.00 D and the back curve reads -5.50 D. the focal length of that lens is: -2.50 +2.50 x 180 the power of a compound lens in any given meridian will vary as the axis of the cylinder changes. which of the following lenses contain no power in the ninety degree meridian? decreases when a plus lens is moved closer to the eye its effective power: be decreased when a high powered minus lens is moved closer to the eye the compensated power must: +10.50 a +10.00 diopter lens is fit at a 14 mm vertex distance. a new frame is selected which positions the back surface of the lens 9 mm from the cornea. the power of the new lens needed to compensate for the change in vertex distance is: +/- 7.00 D it is important to consider vertex distance in spectacle lenses when the power exceeds: meniscus when a lens shape contains one convex surface and one concave surface, it is called a_________ lens. diopters of prism the amount of power contained in any given prism is correctly expressed as: flat top fused bifocals are available in a variety of styles. which of the below listed lenses can be manufactured with a fused segment? in the geometric center in a round bifocals segment you will find the optical center located: 50% the intermediate power most common in trifocal lenses is: flat top which of the following bifocal segments contain the least amount of image jump? -0.75-0.75x30 Rx: -2.00-0.75x30 add +2.50 if this lens was made utilizing a standard trifocal design, what would be the power through the intermediate portion? 1.590 the refractive index of polycarbonate is: with aspheric front surfaces, as lenticular designs, as full field lenses cataract spectacle lenses can be made: are thinner and flatter when compared to conventional spherical lenses, aspherics: electrician occupational multifocal lenses are useful for a variety of purposes. a double segment "D" style lens might be worn by: aspheric front curves the usefulness of cataract spectacle lenses can be improved by using: by referring to engraved ID markings some aspheric lenses can be identified by manufacturer: 22-25 mm depending on brand the minimum fitting height for most progressive addition lenses is: early presbyopes the best candidates for progressive powered lenses are: sports eyewear, children's glasses, industrial safety glasses polycarbonate lenses, because of their superior impact resistance, are frequently used in: greater than CR 39 the index of refraction of polycarbonate is: most minus power "conventional" slab off is ground with base up prism in the reading portion only on the lens with the _______ in the vertical meridian. excessive prismatic imbalance at the reading level bicentric grinding or slab off is generally prescribed for the correction of: least minus lens the reverse slab off lens design utilizes base down prism in the lens with the ____________ in the vertical meridian. 2.5 A Rx: +4.50+0.50x90 +2.00+0.25x90 add +1.75 what is the vertical prismatic imbalance at a 10mm reading level? reading addition when calculating vertical prismatic imbalance, all of the following need to be considered except: 2.0 A BU, OD in the following prescription, indicate the amount of conventional slab off needed to neutralize the vertical prismatic imbalance. the reading level is 10mm. Rx:-5.00-0.50x180 -2.75-0.75x180 add +2.50 monocular PD and monocular segment height progressive power lenses require the following measurements in order to be accurately fit: polycarbonate of the lens materials listed below, which is the most impact resistant? they significantly reduce glare a primary benefit of polarized lenses is: geometric center the boxing method of measurement is especially useful since it can accurately locate the _________ of the lens. +5.00-1.00x120 +4.75-0.75x110 Rx: +2.75-1.00x120 +2.50-0.75x110 add +2.25 the patient has requested a pair of single vision lenses to use exclusively for reading at the near point. what will be the power of these lenses? the lens depth