Lens calipers - Study guides, Class notes & Summaries

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...

ABO Practice Test Questions and Answers Already Passed 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 me...

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 ...

How do you lower the front of the frame? - ANS 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? - ANS 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? - ANS Positive face form The new bifocal wearer must: - ANS Drop the eyes to read a book ...

ABO PRACTICAL TEST LATEST WITH CORRECT ANSWERS 2023/2024 Single Vision - CORRECT ANSWER-corrects for one distance Multifocal - CORRECT ANSWER-Corrects with two or more prescriptions (or 'powers') Bifocal - CORRECT ANSWER-lens having two focus strengths Trifocal - CORRECT ANSWER-pertaining to having three focus strengths Calculating Prismatic Effects - CORRECT ANSWER-obtained at the center of an optical lens by producing a difference in edge thickness, either by grinding the back surfa...

ABO REVIEW LATEST 2023 GRADED A+ 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 meas...

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 o...

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 optical center o...

To widen the distance between the pads of a frame or mounting, bent the pad arms: - Outward/Angle the temples upward from the end pieces. A reverse slab-off is molded with base _____ prism in the near portion of the lens. - Down Multifocal height is usually determined by measuring from the: - Lower edge of the lens. If the pad arms are lengthened, this adjustment will: - Push the front out more. A semi-rimless mounting consists of: - A center piece with lens bars connecting the end p...