High index of refraction - Study guides, Class notes & Summaries

When taking seg height measurements, which of the following situations could result in a parallax error? - ANSWER Patient sitting/ dispenser standing erect Which of the following is not significant in identifying the problem of vertical imbalance? - ANSWER Patient's age Which of the following elements is NOT critical when determining vertical imbalance? - ANSWER Lens power in the 180 degree meridian A prism will displace the object being viewed towards its ________. - ANSWER Apex A ...

The basic definition of a prism may be expressed mathematically as: - 1cm/1m=1 prism Prentice's Rule states that the amount of induced prism equals to - Power of the lens times the decentration in millimeters divide by 10 (prism= F x dec (mm) divided by 10) A minus lens gets ________ the closer to the eye. - stronger Axis is _______________________. - a notation of position in relation to the cornea and the corrective lens. Axis notations have no value. Decentering a minus lens outward w...

The amount of reflection of each surface of CR-39 lenses is approximately - 4% The absorption of light in lenses is classified by two variables. What are they? A. base curve and thickness B. index of refraction and thickness C. thickness and lens transmission D. tint and lens transmission - D. tint and lens transmission The denser the tint in a lens A. the greater the transmission of light through the lens B. the greater internal reflections in the lens C. the less transmission of light...

ABO ADVANCE STUDY GUIDE AND CORRECT SOLUTIONS 2023/2024 LATEST When taking seg height measurements, which of the following situations could result in a parallax error? - CORRECT ANSWER-Patient sitting/ dispenser standing erect Which of the following is not significant in identifying the problem of vertical imbalance? - CORRECT ANSWER-Patient's age Which of the following elements is NOT critical when determining vertical imbalance? - CORRECT ANSWER-Lens power in the 180 degree meridi...

Because children have a high degree of focusing ability, your doctor might want to temporarily relax the eyes muscles. This procedure is known as what? - Cycloplegic refraction What lens style is also referred to as a "no line bifocal"? - Varifocal or Progressive For hyperopes under the age of 40, what is a common symptom after long periods of reading? - Blurred vision at distance Can scratches on spectacle lenses be polished out? - No: furthering polishing would change the index of re...

Prentice's Rule - ANSWER-P = f x c P = amount of prism correction f = lens power (in diopters) c = decentration (the distance between the pupil centre and the lens's optical centre, in millimeters) Cornea IOR - ANSWER-1.37 Tear Film, Vitreous IOR - ANSWER-1.33 Crystalline lens IOR - ANSWER-1.42 Optical Standard index of refraction - ANSWER-1.53 Crown Glass index of refraction - ANSWER-1.523 High index IOR - ANSWER-1.74 CR-39 IOR - ANSWER-1.49 - 1.50 Poly index of ref...

ATT Week 11 Test (FC) What causes refraction? - A change in the speed of light. What is the most common optical detector? - Photo Diodes. __________ determines the color of light. - Wavelength What affects a detectors responsivity? - Changes in wavelength. The range of frequency that an optical fiber cable has is known as___________. - Bandwidth What optical fiber cable is made of several concentric layers? - Multimode graded-index What is a superheterodyne good for? - Extre...

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 a...

Medium used to send information - Answer light What are the four parts of a fiber optic data link - Answer transmitter, optical fiber, connectors/splices, receiver fiber optic transmitter has which of the following functions - Answer converts the electrical input signal to an optical signal Fiber optic systems used what three type of optical sources - Answer LEDs, lasers, VCSEL(vertical cavity surface emitting lasers) fiber optic receiver performs which of the following functions? - ...

ABO advance study guide | with complete solution When taking seg height measurements, which of the following situations could result in a parallax error? - Patient sitting/ dispenser standing erect Which of the following is not significant in identifying the problem of vertical imbalance? - Patient's age Which of the following elements is NOT critical when determining vertical imbalance? - Lens power in the 180 degree meridian A prism will displace the object being viewed toward...