Quick Quiz Flashcards
To what does a pros is crutch give support?
Upper Lid
A lens focal length can be altered by?
Changing the curvature of one surface
Which instrument measures vertex distance ?
Disometer
What controls the amount of light that enters the eye?
Iris
Which word is used to describe lights changing direction as it passes from one medium to another?
Refraction
Frame materials are available in which two forms?
Metal and plastic
Meniscus equiconacve and flat concave are types of
Minus lenses
What is the term used to describe the eyes tendency to turn from its normal position?
Phoria
What is the refractive condition in which light focus directly on the retina?
Emmetropia
What is the refractive condition in which light touches directly on the retina?
Emmetropia
What kind of lens has on convex and one concave surface?
Meniscus
What material has the most favorable optical properties
Crown glass
What’s the best lens treatment to reduce water and road surface glare?
Polarized
Which private agency is responsible for establishing commercial and industry standards
ANSI
Which Fran adjustment lowers the front of the frame?
Spreading the arms further apart
