Glossary

Emmetropia:

The normal eye can focus light on the retina to create a sharp image.  This condition is known as emmetropia.
Any state other than emmetropia is called ametropia, and results in a refractive error.

Myopia:

The nearsighted eye is too long and light is focused in front of the retina. This condition is called myopia

Hyperopia:

The farsighted eye is too short and light is focused behind the retina.  This condition is called hyperopia.

Presbyopia:

 

Monofocal Lens:

 

Multifocal Lens:

 

Toric Lens:

 

Multifocal Toric:

 

Piggyback Lens:

 

Phakic:

 

Pseudophakic: