Types and uses of corrective lenses

Question 1

A lens that has the sane curvature over its entire surface and, thus, the same refractive power in all directions, or meridians, is referred to as _______

Answer 1

A spherical lens

Question 2

Spherical plus-power lenses provide clear near and distance vision for ________ people

Answer 2

Hyperopic

Question 3

Spherical minus-power lenses are used to provide distance vision for _______ people

Answer 3

Myopic

Question 4

A lens with 2 visual purposes; commonly for the correction of both distance and near vision

Answer 4

Bifocal

Question 5

A lens that has 3 powers: one for correcting distance, one for correcting intermediate range of sight, and one for correcting near vision is called a

Answer 5

Trifocal

Question 6

The portion of the multifocal lens (usually lower) that provides correction for near vision is called the ___

Answer 6

Add

Question 7

A lens that has curvature in only one meridian is a

Answer 7

Cylindrical lens

Question 8

The meridian perpendicular to the meridian with curvature in a cylindrical lens

Answer 8

Axis

Question 9

A combination of a spherical lens and a cylindrical lens is a ________, sometimes referred to as a toric lens

Answer 9

Spherocylinder

Question 10

The measurement of certain qualities of lenses by the use of a lensmeter

Answer 10

Lensometry

Question 11

_______ are used to measure extraocular muscle imbalances , and can be incorporated in eyeglass lenses to correct diplopia

Answer 11

Prisms