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20 Cards in this Set
- Front
- Back
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“X” Axis |
The horizontal or 180 degree meridian. |
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Optical Generator |
Machine used for surfacing the back of ophthalmic lenses. |
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Prism |
Triangular shaped piece of glass or plastic that deviates the light. |
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Base Down |
Vertical placement of a prism in a downward position. |
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Base In |
Horizontal placement of a prism in a base direction that is toward the nose. |
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Base Out |
Horizontal placement of a prism in a base direction that is toward the temple. |
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Base Up |
Vertical placement of a prism in an upward position. |
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Bicentric Grinding |
Surfacing a portion of a lens to create a second optical center, to correct for vertical imbalance. Also known as slab-off. |
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Binocular Vision Grade 1 |
Vision in which there is simultaneous perception. |
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Binocular Vision Grade 2 |
Vision in which there is simultaneous perception as well as fusion. |
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Binocular Vision Grade 3 |
Highest quality of vision in which there is simultaneous perception, fusion, and stereopsis. |
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Strabismus |
The condition whereby one eye is pointed in a different direction than the other eye. |
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Decentration |
The displacement of a lens optical center away from the wearer’s line of sight for the purpose of creating a prismatic effect. |
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Fusion |
Binocular process in which each eye exerts the effort to fixate on the same object. |
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Prentice Rule |
A rule used to determine unwanted prism. |
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Prism Diopter (^) |
a unit of measurement that shows deviating power. |
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“Y” Axis |
The 90 degree or vertical meridian. |
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Stereopsis |
Three dimensional vision possible only when binocular vision and fusion are present. |
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True Image |
The retinal image in the normally fixating eye in strabismus. |
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False Image |
The retinal image in the deviating eye in strabismus. |
