akhtar lab Flashcards
(13 cards)
Trivex is not a mid index lense, safety lens for active adults, High index lense that children should always wear, Great lens for clarity and weight
High index lense that children should always wear
Plano lenses contain
no prescription
Measuring a trifocal from the top of the segment to the middle line for height intermediate, length intermediate, width or trifocal or none of the above
height
Progressive lenses can be prescriped as a multifocal with continuous vision, a lens most like a wears natural vision, a lens design that can custom design to fit a persons RX and visual axis
All of the above
Progressive lens design has helped us identify, fit, and neutralize lenses What are they, identical lines, symbols and coats, unique markings, squiggles and marks or coats and arts
unique markings
Glass lenses are _ in most materials
more stable
Trivex lens material has Exceptional optical clarity, impact resistance similar to poly, and a specific gravity of 1.11. All of the above
all of the above
High-index lenses reduce magnification, reduce minification, facial distortion, all of the above or none of the above
All of the above
Anti reflective treatment in coating allows less transmission of light blue lens or transmission of light blue lens in the top coating of the lens, or allows some transmission of light
Allows more transmission of light
Experts report that as much as __% of damage to our eyes occur before the age of 18
80%
The most harmful UV read lens or by the focal meter is A, B, C or D
C
polarized lenses are horizontal light waves, parallel lightwaves, Vertical lightwaves,or
Vertical light waves
Plastic cr-39 are more resistant to scratches if they are treated by front and back surface, the front surface, the back surface only or cr 39 lens already come with scratch coat.
Front and back surfaces
