Math Principles
Finish the phrase:
What you do to one side of the equation
You must do to the other.
The law of reflection states...
the angle of incidence = the angle of reflection.
Are used to treat a refractive condition called hyperopia.
What is a plus lens
Type of lens that converges light.
Convex
This is defined as the starting curve where all other curves on the lens are calculated. It is also defined as the least plus on the front surface of the lens.
Base Curve
-4 - (-2) =
-2
When light strikes a transparent surface (such as glass or plastic), a small portion of it is reflected but most passes through the transparent material. This is known as
Refraction
The total bending power of the lens
Type of lens that diverges light
Concave
Transpose -2.00 -1.00 x90 into plus cylinder form
-3.00 +1.00 180
-4 + -2 =
-6
Which direction is a light ray bent when traveling from air to water?
Toward the normal
Focal length is measured in
Meters
A lens that has one toric surface and one spherical surface.
Cylindrical
When stating lens formulas or patient's prescriptions, in normal practice we only break the diopter into
1/8 diopters
-1 x -2 =
2
Which direction is a light ray bent when traveling from glass to air?
Away from the normal
What is the focal length of a –2.50 D power lens.
0.4M
First step in hand neutralization
Determine lens type
A lens with no power is referred to as
Plano
The reciprocal of 3
.33
The visible form of electromagnetic radiation
What is light
If we have a light source that is 40 cm to the left of a +6.00 D lens, where will the light come to a focus?
0.29M or 29cm
When neutralizing a concave lens - with the trial lens you still have a "with motion" the lens is
not strong enough
A diagram, which represents the dioptric powers of the two principle meridians of a lens.
Optical Cross