ABO

Change a bifocal Rx to a single vision Rx Add the bifocal power to the sphere powers. OD: -0.50 OS: -0.25-0.25x172 Add: +1.75 Turns into- OD: +1.25 OS: +1.50-0.25x172 Anisometropia There is a difference of 3 diopters between both eyes; when the vision of the eyes differs by a large margin. Antimetropia Refers to Rx's that differ in sign. Ex. OD: +0.25 OS: -0.75 Simple Hyperopia The Rx will be a + sphere Simple Myopia The Rx will be - sphere Marc...

Which of the following is NOT a characteristic of a Plus Lens: A) Magnifies B) Real Focal Length C) With Motion D) Strengthens as Vertex Increases C) With Motion The weight of the standard dress safety drop ball according to the FDA regulations is: A) 72 ounces B) 6.5 ounces C) 8.7 ounces D) .56 ounces D) .56 ounces Which of the following refers to the normal eye? A) Emmetropic B) Exophoric C) Anisometropic D) Prebyopic A) Emmetropic The prescription +2.00-1.7...

How do you lower the front of the frame? Move nose pads further apart or increase pantoscopic tilt (2 degrees = 1mm) If the wearer complains that the glasses feel snug but still slip down the nose, one likely cause is that? Pressure is being applied by the temple shafts anterior to the ear. When the wearers PD is less than the frame PD what should you do? Positive face form The new bifocal wearer must: Drop the eyes to read a book When the frame front is tested fo...

Single Vision corrects for one distance Multifocal Corrects with two or more prescriptions (or 'powers') Bifocal lens having two focus strengths Trifocal pertaining to having three focus strengths Calculating Prismatic Effects obtained at the center of an optical lens by producing a difference in edge thickness, either by grinding the back surface at an angle to the front surface during lens surfacing or, if the lens has sufficient power, de-centering the optic...

Corpuscular the theory which explains light as a stream of invisible bundles of energy Photons the visible bundles of energy Electromagnetic Theory The theory which explains light as moving in a series of wave pulsations. 186,000 miles per second the speed of light in air ray a point of light pulsating in a straight line all colors the colors that visible or white light are composed of base a prism will bend light towards its one meter one diopter prism...

the wavelength of the infrared waves in the electromagnetic spectrum are longer than visible red light waves the Geneva Lens Measure is calibrated for a refractive index of 1.530 A lens made from 2 convex surfaces has against motion A lens reads +4.25D in the vertometer. If the ocular curve is -4.00D, what is the front base curve? +8.25D Which of these front base curves would be suitable for a -300D meniscus lens? +4.50 A tinted lens will absorb visible li...

The ability of the eye to focus on objects at different distances Accommodation Fresnel optics Press on prism Frame material that resist stretching with heat Nylon Bridge type that spreads weight over the greatest area Saddle Amount of jump image is not affected by The seg inset Double vision Diplopia Modern AR coated lenses transmit how much light 99.5% Shortest wavelength Violet The condition where Rays of light focus behind the r...

Accommodation Focusing of the eye in a near object theough relaxation of the ciliary muscle and thickening of the lens. Amblyopia The loss of vision without any apparent disease of the eye. Ametropia A refractive error in which the eye, when in a state of rest, does not focus the image of an object upon the retina, includes hyperopia, myopia, and astigmatism Aniseikonia A condition in which the ocular image of an object as seen by one eye differs so much in size or shape...

Sclera Tough, white outer coat of the eyeball myopia nearsightedness; the condition in which parallel rays of light are brought into focus in front of the retina, rather than on it reflection light that bounces back refraction when the direction of light changes as it passes from one medium to another(bending of light) presbyopia Age of 40 need reading glass crystalline lens diminishes frame difference the difference betweeen the horizontal and vertical ...

If the wearer complains of the bifocal line being somewhat in his way when driving, the problem may be alleviated by decreasing the distance between pads. True or False False If the wearer complains that the glasses feel snug but still slip down the nose, one likely cause is that: A. The frame is too small B. The bridge fit is tight C. Pressure is being applied by the temple shafts anterior to the ear. D. Pressure is being applied on the very tips of the temples. Pressure is be...