Sphere, Cylinder Flashcards

1
Q

Define meridian

A
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2
Q

Define a spherical lens

A

Optical lens with a symmetrically curved surface, resembling a portion of sphere
Power along all meridia is the same

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3
Q

Define a cylindrical lens

A

Optical lens that only has a curved surface in one direction along the axis of the lens

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4
Q

What is the axis of the lens

A

An imaginary line that runs through the centre of the lens perpendicular to its surface

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5
Q

What are the 3 types of toroidal surfaces

A

Tyre formation surface
Barrel formation surface
Capstan formation surface

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6
Q

What is a crossed cylinder

A

Two cylindrical surfaces with their axis perpendicular

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7
Q

What is the base curve and cross curve

A

Base curve- surface power in shallower principal meridian
Cross curve- surface power in steeper principal meridian (value numerically furthest from zero)

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