ABO EXAM PACKAGE DEAL, SCORED A+

According to ANSI standards, a lens with .50D of cylinder must have an axis within - 7 degrees Duty to warn: - Requires opticians to warn patients of significant risks in certain aspects of lenses and frames In drop ball testing a __ ball is dropped from ___ onto the surface of the lens - 5/8 in,...

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...

-2.50-0.50x180 - the three closely spaced parallel lines come into sharp focus when the power drum reads -2.50D and the axis wheel is set at 180 degrees. in order to bring the three widely spaced lines into focus, the power drum must be moved to read -3.00D. prescription? 1.0 prism diopters base ...

What is the minimum safety thickness? A) 3.00mm B) 2.2mm C) 1.5mm D) 4.25mm - A) 3.00mm A lens reads +4.25 in the vertometer. If the ocular curve is -4.00 what is the front base curve? A) +0.25D B)+4.00D C)+6.25D D)+8.25D - D)+8.25 Anti reflective coating of a lens is based on the principl...

Also produces a liquid that soothes and lubricates the eye. These secretions combine with those from the Meibomian glands to make up the eyes tear - Lacrimal Caruncle A transparent dome shaped layer that sits in front of the eye and lets light enter through - Cornea Acts as a protective barrier o...

When should you use occluder? - For noticeable eye abnormalities. Ex.: Strabismus. Also to check binocular PD by occluding each eye to see if eye moved when occluded. BD/BD - Cancels- subtract BI/BI - Compounds- add BI/BO - Cancels- subtract Binocular PD - Total PD of both eyes together. From o...

the ability of the eye to focus objects at varying distances is called - accommodation 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 ...

refraction - when the direction of light changes as it passes from one medium to another(bending of light) a lens has a front surface power of +2.00D and a back surface power of -8.25. the corrective power is.. - +2.00 ( -8.25 = -6.25D Absorption - amount of light that stays in an optical materi...

Which tint color most strongly absorbs blue light - Yellow Looking below center of a minus lens results in base __ prism - Down A -6.50 lens decentered 2 mm results and how much prism - 1.3 A lens front surface curve is +4.25 and the back surface curve is -7.00 -.50 X 65. What is the lens power? ...

A patient complains that the floor seems to be concave, is possible experiencing excessive A. Base In Prism B. Base Out Prism C. Base Down Prism D. Base Up Prism - Base Down Prism A -3.00 powered lens has a base curve of +4.25. What is the ocular curve? A. +3.00 B. -4.25 C. -3.00 D. -7.25 -...

The larger the frame difference --------- the lens shape A. Rounder B. More squared off C. Narrower D. Wider - Narrower Which of the following statements regarding CR-39 lenses is not correct? A. They are light B. They are thinner than glass lenses C. They scratch easily D. They are tintabl...