Term
| What ophthalmic lens company invented photocromic lenses? |
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Definition
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Term
| Why was the invention of spectacles not a major event? |
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Definition
| Not many people can read and there was not much use of printed media back then |
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Term
| What name do we give to ophthalmic lenses when they are created on a 6.00 D base curve? |
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Definition
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Term
| If a patient is given aspheric lenses, what might they enjoy about them optically? |
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Definition
Wider field of view
Spherical aberration correction (makes corrected image less blurry)
Improved peripheral vision |
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Term
| Why were minus cylinder lenses created? |
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Definition
| They couldn't fit the base curve on front so they put it on the back |
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Term
| What is the difference between today's AR coatings and the original? |
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Definition
| Back in the day the AR coatings were 1 coating and today at least 5 coats are used |
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Term
ROYGBIV
The colors of the visible spectrum are? |
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Definition
Red
Orange
Yellow
Green
Blue
Indigo
Violet |
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Term
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Definition
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Term
| Which wavelength of light immediately follow the visible spectrum? |
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Definition
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Term
| Whose theory of light from the 1600's explains all that we know about the behavior of light today? |
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Definition
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Term
| The first bent lens had what dioptric value for its curvature where the lenses used to be flat? |
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Definition
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Term
| What is the speed of light in the Hoya Profection lens? |
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Definition
1.70 is the n for Hoya so 186,000 miles per second divided by 1.70
109,412 |
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Term
| When light rays enter a polycarbonate lens they will bend? |
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Definition
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Term
| What is the lowest specific gravity of any lens ever made? |
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Definition
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Term
| What are the ingredients of Crown glass? |
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Definition
Silica sand
Potassium oxide
Soda
Lime
Arsenic/others |
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Term
| The difference with Flint glass? |
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Definition
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Term
| Which glass is the most difficult to manufacture? |
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Definition
| Barium. Has better optics but difficult to manufacture just like flint imagine chandeliers chips easily |
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Term
| Pittsburgh plate glass makes what? |
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Definition
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Term
| Polycarbonate is the go to recommendation by opticians because? |
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Definition
| It is the safest lens in the world |
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Term
| Who is the biggest lens manufacturer today? |
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Definition
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Term
| The FDA decided you have to temper glass and had what kinds of tests for them? |
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Definition
Drop ball test.
But you couldn't test plastic that way as it would scratch. So the FDA said lets let the manufacturer test and they did batch testing |
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Term
| Light is divergent meaning? |
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Definition
| Light spreads in all directions |
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Term
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Definition
20/20 vision
Because of diverging light we do eye exams at 20 feet |
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Term
| Why does light bend when it hits a lens |
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Definition
| Its being slowed down and being pushed. Imagine it crashing at 186,000 then it hits the lens and instantly goes to 124,000 |
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Term
| When light hits a lens at 186,000 miles per second what is the new speed on contact? |
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Definition
| 124,000 and that is a 62k drop. The faster one is pushing on the slower one |
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Term
| Incident upon surface is not right the words we want to see are? |
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Definition
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Term
| What is the definition of angle of incidence |
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Definition
| The angle which an incident line or ray makes with a perpendicular to the surface at the point of incidence. |
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Term
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Definition
| Index 8 the highest glass index in the U.S. |
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Term
| Plus lenses have what type of motion? |
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Definition
Against Motion (Move to the right it goes left)
Some patients call is "Swing" |
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Term
| What is gods gift to opticianry |
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Definition
Presbyopia
farsightedness caused by loss of elasticity of the lens of the eye, occurring typically in middle and old age. |
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Term
| farsightedness caused by loss of elasticity of the lens of the eye, occurring typically in middle and old age. is called what? |
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Definition
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Term
| If the index is higher than light will do what when it hits the lenses? |
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Definition
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Term
| If the globe is "too short" then its? |
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Definition
Hyperopia
eye too weak
globe too short |
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Term
| What is the age where you don't really see myopics? |
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Definition
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Term
| Everyone is born basically what? |
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Definition
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Term
| The perfect human eye should be |
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Definition
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Term
| How do we correct hyperopia? |
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Definition
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Term
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Definition
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Term
| If light goes from a dense to a denser medium it? |
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Definition
| Will be bent towards the normal |
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Term
| If light goes from a dense to a less dense medium it? |
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Definition
Will be bent away from the normal
unless THE INCIDENT LIGHT STRIKES THE SURFACE AT A PERFECT 90 DEGREE ANGLE |
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Term
| What is the definition of refraction? |
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Definition
| The bending of light as it passes obliquely from one medium to another of a different index of refraction (N) |
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Term
| Who discovered refraction? |
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Definition
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