Lecture 11 - Environmental Applications Flashcards
What are enchroma lenses?
For color deficiency
- may or may not affect the individual
- help with contrast
Who are oxy-iso glasses for?
Those with color deficiency or those working with veins and blood (ex: horses or phlebotomist)
What do oxy-iso glasses do?
Enhance O2 signal from hemoglobin under the skin, which amplifies the perception of veins under the skin
What new technology is good for astronauts?
Switch vision
-supplies interchangeable magnetic prescription lenses
What new technology is used in movie theaters?
Close caption glasses
-changes language to words you can read
What new technology records you?
Snap spectacles
Conduction technology
Bone conduction tech so you don’t need earphones, touch interface to control music and calls
Liquid lenses
Shape changes according to distance of objects
Connected to internet that allows you to change your RX
Made of glycerine
Oakley airwave are for what?
Sports ware
Like seeing skiiing slopes and maps
where the AR coating applied to the lens surface
is ¼ of the wavelength of light thick. The reflected path from the back of the coating with be 1/2 ⋋ longer. Light reflected from the back of the coating is thus 180 degrees out of phase from light reflected from the front. If the amplitude of light reflected at each surface of the coating is equal then they will cancel each other out
Path condition
Solution to reflection
Where the amplitude of light reflected from
each surface of an AR coating is equal and, if 180 degrees out of phase, will cancel each other out. For this to occur, the refractive index of the coating must be equal to the square root of the refractive index of the lens material
Amplitude condition
Solution to reflection
Equation for solutions to reflection
n(coating) = square root (n(lens))
What’s the greatest amount of layers and different indices?
7
Why are multiple layers necessary?
Multiple different wavelengths are needed to be blocked
What company is good with photochromic glass lenses?
Corning
What colors do Corning create for photochromatic glass lenses?
Gray
Brown
Green
Orange
What glass lens blanks are used by Corning?
1.60 to 1.90
Over years, Corning glass lenses show what from normal use?
Reversibility maintained = good lenses
What are drivesafe lenses used for and who are they created by?
ZEISS
- reduce glare while driving at night
- maintain an accurate view of the road, dashboard, near and side view mirrors
Luminance design technology for drivesafe lenses takes what into account?
Changes in size of the driver’s pupils is taken into account while driving
Short fit has issues, but allows you to do what?
Put add power in short (small) frames
Occupation PAL’s are used for what?
-To emphasize intermediate and near vision
-Computer use, office-related tasks
-Wide inter, near - low level of unwanted astigmatism in periphery
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Double D lenses are what?
Double segment flat top bifocals
Bottom -near
Top -near
Remainder -distance
Who are double seg flat top bifocals good for?
For people who work in
confined spaces that need to see up close, above and below them, without moving their
heads
-plumbers, electricians, painters, mechanics, Air Force controller
